The document provides information on self-microemulsifying drug delivery systems (SMEDDS), including their definition, components, mechanism of action, formulation, evaluation, and applications. SMEDDS consist of oils, surfactants, and cosolvents/surfactants that form fine oil-in-water microemulsions upon mild agitation followed by dilution in aqueous fluids. The small droplet size of SMEDDS enhances drug absorption by increasing surface area and promoting intestinal lymphatic transport. SMEDDS have shown improved oral absorption for several poorly soluble drugs over conventional formulations.
This slide share includes the introduction about smedds, difference between emulsion and smedd and sedds and smedds, composition and its formulation aspects.
This presentation includes the detail information about the physics of tablet compression and compaction, Compression, Effect of friction, distribution of forces, compaction profiles,solubility.
This slide share includes the introduction about smedds, difference between emulsion and smedd and sedds and smedds, composition and its formulation aspects.
This presentation includes the detail information about the physics of tablet compression and compaction, Compression, Effect of friction, distribution of forces, compaction profiles,solubility.
it provide a brief note on the drug excipient interaction and various technique to find it which is a part of preformulation studies. it gives help to mpharm(pharmaceutics) students. i.
M.pharm (Pharmaceutics) modern pharmacy unit-5 Study of consolidation parameters; Diffusion parameters, Dissolution
parameters and Pharmacokinetic parameters, Heckel plots, Similarity factors – f2
and f1, Higuchi and Peppas plot, Linearity Concept of significance, Standard
deviation , Chi square test, students T-test , ANOVA test
Description about a type of activation modulated drug delivery system, which a type of control drug delivery system.
Also, give a detailed description about each subclassification.
CrDDS is one which delivers the drug at a predetermined rate, for locally or systematically, for a prolong period of time.
Self Nano-emulsifying drug delivery system (SNEDDS)Sagar Savale
The Self Nano-emulsifying Drug Delivery System (SNEDDS) is a Novel Drug Delivery System for Enhancement of water solubility of poorly water soluble drugs. It is isotropic mixture of oil, surfactant, co-surfactant molecules and it also containing co-solvent molecule.
it provide a brief note on the drug excipient interaction and various technique to find it which is a part of preformulation studies. it gives help to mpharm(pharmaceutics) students. i.
M.pharm (Pharmaceutics) modern pharmacy unit-5 Study of consolidation parameters; Diffusion parameters, Dissolution
parameters and Pharmacokinetic parameters, Heckel plots, Similarity factors – f2
and f1, Higuchi and Peppas plot, Linearity Concept of significance, Standard
deviation , Chi square test, students T-test , ANOVA test
Description about a type of activation modulated drug delivery system, which a type of control drug delivery system.
Also, give a detailed description about each subclassification.
CrDDS is one which delivers the drug at a predetermined rate, for locally or systematically, for a prolong period of time.
Self Nano-emulsifying drug delivery system (SNEDDS)Sagar Savale
The Self Nano-emulsifying Drug Delivery System (SNEDDS) is a Novel Drug Delivery System for Enhancement of water solubility of poorly water soluble drugs. It is isotropic mixture of oil, surfactant, co-surfactant molecules and it also containing co-solvent molecule.
A Review on Solid Self Micro emulsifying Drug Delivery System A Method for En...ijtsrd
arly 40 of new drug candidates possess low aqueous solubility, which is a challenge in development of optimum oral solid dosage form in terms of formulation design and bioavailability of new pharmaceutical products. In recent years, lipid solutions, emulsions and emulsion pre concentrates, which can be prepared as physically stable formulations suitable for incorporation of such poorly soluble drugs are gaining attention. Among lipid based formulations, self micro emulsifying formulations with droplet size 100 nm are capable to improve the oral bioavailability of hydrophobic drugs primarily due to their efficiency in facilitating solubilization and in presenting the hydrophobic drug in solubilized form whereby dissolution process can be circumvented. Self micro emulsifying drug delivery systems SMEDDS are physically stable isotropic mixture which are easy to manufacture and can be filled in soft gelatin capsules and capable to generate a drug containing micro emulsion with a large surface area upon dispersion in the gastrointestinal tract. The micro sized emulsion will facilitate the absorption of the drug due via intestinal lymphatic pathway and by partitioning of drug into the aqueous phase of intestinal fluids. Some disadvantages are possessed by Conventional SMEDDS which are prepared in a liquid form. So solid SMEDDS S SMEDDS prepared by solidification of liquid semisolid self micron emulsifying systems into powders, tablets, pellets etc have gained popularity. In this review, an overview of SMEDDS, their solidification techniques and various factors that potentially affect the oral bioavailability of such drugs are presented. Bhondve Riya R | Kakade Sujit S | Bhosale Ashok V "A Review on Solid Self Micro-emulsifying Drug Delivery System: A Method for Enhancement of Oral Bioavailability" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-7 | Issue-3 , June 2023, URL: https://www.ijtsrd.com.com/papers/ijtsrd56288.pdf Paper URL: https://www.ijtsrd.com.com/pharmacy/pharmaceutics/56288/a-review-on-solid-self-microemulsifying-drug-delivery-system-a-method-for-enhancement-of-oral-bioavailability/bhondve-riya-r
Characterization of Self-Microemulsifying Dosage Form: Special Emphasis on Ze...BRNSS Publication Hub
The emulsion is a disperse system which is thermodynamically unstable. To improve the stability of the disperse system microemulsion or nanoemulsion was prepared to improve thermodynamic stability. Zeta potential is a physical property which is exhibited by any particle in suspension/emulsion, i.e., in colloidal dispersion. It can be used to optimize the formulations of suspensions and emulsions. Zeta potential is the measure of overall charges acquired by particles in a particular medium and is considered as one of the benchmarks of stability of the colloidal system. As a rule of thumb, suspensions/dispersed system with zeta potential above 30 mV (absolute value) are physically stable. Suspensions with a potential above 60 mV show excellent stability. Suspensions below 20 mV are of limited stability; below 5 mV they undergo pronounced aggregation if the system is stabilized by the electrostatic mechanism. If the values are low for visually stable emulsions, it could be attributed to steric repulsion between approaching molecules, i.e., system is sterically stabilized. Such sterically stabilized colloidal systems though they have low zeta potential values are found to be stable during storage. Tween is well accepted steric stabilizer for colloidal systems. Stability of such a visually stable emulsion or microemulsions should be carried out under accelerated or long-term stability conditions to confirm the globule size and zeta potential on aging.
Self Micro emulsifying Drug Delivery System A Promising Technique to Enhance ...ijtsrd
Oral route of administration has been favoured route and has dominated over other routes of administrations. However this chosen route is restricted to those drugs molecule that are permeable across the gastric mucosa and are at least sparingly soluble. Approximately 40 of new chemical molecules exhibit poor aqueous solubility and exhibit a foremost challenge to modern drug delivery system, because of their low bioavailability due to its solubility. The solubility of poorly water soluble drugs can be enhanced by incorporating active pharmaceutical ingredients into oral lipid based drug delivery systems. Self micro emulsifying oil formulations are mixture of synthetic or natural oil, liquid or solid surfactant, hydrophilic solvent and co surfactant. It offers advantages like simplicity to manufacture, convenience in scale up, less interference of food on the dosage form and has the capability to deliver peptides. ying drug delivery systems SMEDDS . SMEDDS have gained exposure for their ability to increase solubility and bioavailability of poorly soluble drugs. SMEDDS, which are isotropic mixtures used for the design of formulations to improve the oral absorption of highly lipophilic drug compounds. Conventional SMEDDS are mostly prepared in a liquid form, which can have some disadvantages. SMEDDS can be orally administered in soft or hard gelatin capsules and form fine relatively stable oil in water emulsions. Solid SMEDDS are prepared by solidification of liquid semisolid self micron emulsifying ingredients into powders, have gained popularity. This article gives a complete overview of SMEDDS, but special attention has been paid to formulation, design, evaluation, and little emphasis on application of SMEDDS. Aditi R. Beldar | Sujit S. Kakade | Ashok V. Bhosale "Self Micro-emulsifying Drug Delivery System: A Promising Technique to Enhance the Solubility of Lipophilic Drugs" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-7 | Issue-3 , June 2023, URL: https://www.ijtsrd.com.com/papers/ijtsrd56297.pdf Paper URL: https://www.ijtsrd.com.com/pharmacy/pharmaceutics/56297/self-microemulsifying-drug-delivery-system-a-promising-technique-to-enhance-the-solubility-of-lipophilic-drugs/aditi-r-beldar
Drug development in the past used to be initiated after the identification of most active molecule. However,
this approach leads to a number of drawbacks with the problems being that many molecules which are
put into development had poor physicochemical such as solubility and stability and biopharmaceutical
such as permeability and enzymatic stability properties, as a consequence of which about 40% of new
chemical entities fail to reach the market place. At present, a number of technologies are available to
deal with the poor solubility, dissolution rate, and bioavailability of insoluble drugs. However, much
attention has been focused on lipid-based formulations, with particular emphasis on self-emulsifying
drug delivery systems (SEDDSs). SEDDSs are defined as isotropic mixtures of natural or synthetic
oils, solid or liquid surfactants, or one or more hydrophilic solvents and cosolvents/surfactants. On mild
agitation followed by dilution in aqueous media, these systems can form fine oil-in-water emulsions
or microemulsions (self-micro-EDDS [SMEDDS]). Self-emulsifying formulations spread readily
in the gastrointestinal tract, the digestive motility of the stomach and intestine provides the agitation
necessary for self-emulsification. SEDDSs produce emulsification with a droplet size between 100 and
300 nm, while SMEDDSs form transparent microemulsions with a droplet size of <50 nm. SEDDSs are
physically stable formulations that are easy to manufacture. Thus, for lipophilic drug compounds that
exhibit dissolution rate-limited absorption, these systems may offer an improvement in the rate and the
extent of absorption.
SELF MICRO EMULSIFYING DRUG DELIVERY SYSTEM [SMEDDS]Sagar Savale
Oral route is the main route of drug administration in many diseases. Major problem in oral route of drug administration is bioavailability which mainly results from poor aqueous solubility. This leads to lack of dose uniformity and high intrasubject/intersubject variability. It is found that 40% of active substances are poorly water-soluble. Various technologies are developed to overcome this problem, like solid dispersion or complex formation. Much attention has been given to lipid-based formulation with particular emphasis on self-micro emulsifying drug delivery system to improve the oral bioavailability of lipophilic drugs. It requires small amount of dose and also drugs can be protected from hostile environment in gut. Self-micro emulsifying drug delivery systems are specialized form of delivery system in which drug is encapsulated in a lipid base with or without pharmaceutical acceptable surfactant.
Self Micro Emulsifying Drug Delivery System (SMEDDS): A ReviewSagar Savale
Objective: Much attention has been given to lipid-based formulation with particular emphasis on self-micro emulsifying drug delivery system (SMEDDS) to improve the solubility and oral bioavailability of lipophilic as well as hydrophilic drugs.
Method: Various reports were taken from review or research articles published in journals, data from various books and other online available literature.
Conclusion: This method is suitable for all BCS class drugs where resulting emulsification gives faster dissolution and absorption rate.
SMEDDS- Self Micro Emulsifying Drug Delivery System.pptxTanmai25
smedds is a lipid based drug delivery system , which uses a lipid as a carrier to deliver poorly soluble drug. Thereby increasing its dissolution and bioavailability.
SMEDDS consists of a mixture of drugs, oils, surfactants and co- surfactants. Gentle mixing of these ingredients in aqueous media generates micro emulsions with a droplet size in a range of 10-100 nm.
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
Best Ayurvedic medicine for Gas and IndigestionSwastikAyurveda
Here is the updated list of Top Best Ayurvedic medicine for Gas and Indigestion and those are Gas-O-Go Syp for Dyspepsia | Lavizyme Syrup for Acidity | Yumzyme Hepatoprotective Capsules etc
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
- Video recording of this lecture in English language: https://youtu.be/kqbnxVAZs-0
- Video recording of this lecture in Arabic language: https://youtu.be/SINlygW1Mpc
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
CDSCO and Phamacovigilance {Regulatory body in India}NEHA GUPTA
The Central Drugs Standard Control Organization (CDSCO) is India's national regulatory body for pharmaceuticals and medical devices. Operating under the Directorate General of Health Services, Ministry of Health & Family Welfare, Government of India, the CDSCO is responsible for approving new drugs, conducting clinical trials, setting standards for drugs, controlling the quality of imported drugs, and coordinating the activities of State Drug Control Organizations by providing expert advice.
Pharmacovigilance, on the other hand, is the science and activities related to the detection, assessment, understanding, and prevention of adverse effects or any other drug-related problems. The primary aim of pharmacovigilance is to ensure the safety and efficacy of medicines, thereby protecting public health.
In India, pharmacovigilance activities are monitored by the Pharmacovigilance Programme of India (PvPI), which works closely with CDSCO to collect, analyze, and act upon data regarding adverse drug reactions (ADRs). Together, they play a critical role in ensuring that the benefits of drugs outweigh their risks, maintaining high standards of patient safety, and promoting the rational use of medicines.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
1. DEPARTMENT OF PHARMACEUTICS
R. C. Patel Institute of Pharmaceutical Education & Research;
Shirpur.
Dist: Dhule, Maharashtra.
Presented By:
Savale Sagar Kishor
M. Pharm (1st sem)
Date - 3/10/2015
1
3. 8. Mechanism of SMEDDS
9. Formulation of SMEDDS
10. Evalution of SMEDDS
11. Applications of SMEDDS
12. Conclusion
13. References
3
4. 1. In recent years, much attention has been focused on oral dosage forms using a self-micro emulsifying
drug delivery system (SMEDDS) for the purpose of improving the solubility and absorption of poorly
water-soluble drugs.
2. SMEDDS consists of a mixture of drugs, oils, surfactants and/or other additives.
Gentle mixing of these ingredients in aqueous media generates micro-emulsions with a droplet size in a
range of 10-100 nm.
3. SMEDDS has been shown to improve absorption of drugs by rapid self-micro
emulsification in the stomach, with the micro-emulsion droplets subsequently dispersing in the
gastrointestinal tract to reach sites of absorption .
4. resultant small droplet size from SMEDDS provides a large interfacial surface area for drug release and
absorption, and the specific components of SMEDDS promote the intestinal lymphatic transport of drugs
Oral absorption of several drugs has been enhanced by SMEDDS.
Introduction
4
5. Definition- “SMEDDS are defined as isotropic mixtures of natural or synthetic oils, solid
and liquid surfactants”.
or
alternatively, one or more hydrophilic solvents and co-solvents/surfactants that have a
unique ability of forming fine oil-in-water (o/w) micro emulsions upon mild agitation
followed by dilution in aqueous media, such as GI fluids.
Self Micro-Emulsifying Drug Delivery System (SMEDDS)
5
6. The basic difference between self emulsifying drug delivery systems (SEDDS) also called as
self emulsifying oil formulation (SEOF)
and
SMEDDS is SEDDS typically produce opaque emulsions with a droplet size between 100
and 300 nm
while ,
SMEDDS form transparent micro emulsions with a droplet size of less than 50 nm
the concentration of oil in SMEDDS is less than 20 % as compared to 40-80% in SEDDS.
6
8. Most of the new drug candidates in development today are
sparingly soluble and associated with poor bioavailability
The main purpose is to prepare SMEDDS for “oral
bioavailability enhancement of a poorly water soluble
drug”.
AIM OF SMEDDS
8
10. according to bio pharmaceutical
classification system(BCS)
the class II drugs have poor solubility and
high permeability , thus the rate limiting
process of absorption is the drug
dissolution step. Formulation plays the
major role in improving the rate and extent
of absorption of such drugs from GI tract.
10
11. Advantages of SMEDDS
1. Improvement in oral bioavailability
Dissolution rate dependent absorption is a major factor that limits the bioavailability of numerous poorly
water soluble drugs. The ability of SMEDDS to present the drug to GIT in solubilized and micro emulsified
form (globule size between 1-100 nm) and subsequent increase in specific surface area enable more
efficient drug transport through the intestinal aqueous boundary layer and through the absorptive brush
border membrane leading to improved bioavailability
2.Ease of manufacture and scale-up
Ease of manufacture and scale- up is one of the most important advantages that make SMEDDS unique
when compared to other drug delivery systems like solid dispersions, liposomes, nano particles, etc.,
dealing with improvement of bio-availability. SMEDDS require very simple and economical manufacturing
facilities like simple mixer with agitator and volumetric liquid filling equipment for large-scale
manufacturing. This explains the interest of industry in the SMEDDS.
3. Reduction in inter-subject and intra-subject variability and food effects
There are several drugs which show large inter-subject and intra-subject variation in absorption leading to
decreased performance of drug and patient non-compliance. Food is a major factor affecting the therapeutic
performance of the drug in the body. SMEDDS are a benefit for such drugs. Several research papers
specifying that, the performance of SMEDDS is independent of food and, SMEDDS offer reproducibility
of plasma profile are available 11
12. 4. Ability to deliver peptides that are prone to enzymatic hydrolysis in GIT
One distinctive property that makes SMEDDS superior as compared to the other drug delivery systems is
their ability to deliver macromolecules like peptides, hormones, enzyme substrates and inhibitors and their
ability to offer protection from enzymatic hydrolysis. The intestinal hydrolysis of pro drug by
cholinesterase can be protected if Polysorbate 20 is emulsifier in micro emulsion formulation .These
systems are formed spontaneously without aid of energy or heating thus suitable for thermo labile drugs
Advantages of SMEDDS over emulsion
1.SMEDDS not only offer the same advantages of emulsions of facilitating the solubility of hydrophobic drugs, but
also overcomes the drawback of the layering of emulsions after sitting for a long time. SMEDDS can be easily stored
since it belongs to a thermodynamics stable system.
2. Microemulsions formed by the SMEDDS exhibit good thermodynamics stability and optical transparency. The
major difference between the above microemulsions and common emulsions lies in the particle size of droplets. The
size of the droplets of common emulsion ranges between 0.2 and 10 μm, and that of the droplets of microemulsion
formed by the SMEDDS generally ranges between 2 and 100 nm (such droplets are called droplets of nano
particles).Since the particle size is small, the total surface area for absorption and dispersion is significantly larger
than that of solid dosage form and it can easily penetrate the gastrointestinal tract and be absorbed. The
bioavailability of the drug is therefore improved.
3. SMEDDS offer numerous delivery options like filled hard gelatin capsules or soft gelatin capsules or
can be formulated in to tablets whereas emulsions can only be given as an oral solutions. 12
13. Dis-Advantages of SMEDDS
1.One of the obstacles for the development of SMEDDS and other lipid-based formulations is the lack of good predicative
in vitro models for assessment of the formulations.
2. Traditional dissolution methods do not work, because these formulations potentially are dependent on digestion prior to
release of the drug.
3. This in vitro model needs further development and validation before its strength can be evaluated.
4. Further development will be based on in vitro - in vivo correlations and therefore different prototype lipid based
formulations needs to be developed and tested in vivo in a suitable animal model.
4. The drawbacks of this system include chemical instabilities of drugs and high surfactant concentrations in formulations
(approximately 30-60%) which irritate GIT.
6. Moreover, volatile co solvents in the conventional self-micro emulsifying formulations are known to migrate into the
shells of soft or hard gelatin capsules, resulting in the precipitation of the lipophilic drugs.
7. The precipitation tendency of the drug on dilution may be higher due to the dilution effect of the
hydrophilic solvent.
8. Formulations containing several components become more challenging to validate. 13
15. In order to make SMEDDS systems pharmaceutically acceptable, it is necessary to
prepare such systems by using nontoxic and safe components. Oil from natural
sources and their derivatives, e.g. triglycerides and fatty acid methyl esters are easily
degraded by microorganism and considered to be harmless to the environment. The
formation of bicontinuous micro emulsions with mineral
oils has been intensively investigated in model experiments and for application in
industrial products. An acceptable lipophilic phase for pharmaceutical uses
would be vegetable oils. The extension of a microemulsion region generally depends
on nature of oil. This is due to differences in oil penetration into the
surfactant layer.
Example:
Castor oil, Sunflower oil, Olive oil, Seseam oil,
Hydrogenated specialty oils
Oil Phase
15
16. Surfactant
A surfactant molecule is formed by two parts with different affinities for the solvents.
One of them has affinity for water (polar solvents) and the other has for oil
(non-polar solvents). A little quantity of surfactant molecules rests upon the water-air
interface and decreases the water surface tension value (the force per unit area
needed to make available surface). That is why the surfactant name: “surface active
agent”.
Classification –
Surfactant molecules may be classified based on the nature of the hydrophilic group
within the molecule. The four main groups of surfactants are
defined as follows,
16
17. 1. Anionic surfactants
2. Cationic surfactants
3. Ampholytic surfactants
4. Nonionic surfactants
1. Anionic Surfactants, where the hydrophilic group carries a negative charge such as
carboxyl (RCOO-),sulphonate (RSO3-) or sulphate (ROSO3-).
Examples: Potassium laurate, sodium lauryl sulphate.
2: Cationic surfactants, where the hydrophilic group carries a positive charge.
Example: quaternary ammonium halide.
3: Ampholytic surfactants (also called zwitterionic surfactants) contain both a
negative and a positive charge.
Example: sulfobetaines.
17
18. 4. Nonionic surfactants, where the hydrophilic group carries no charge but
derives its water solubility from highly polar groups such as hydroxyl or
polyoxyethylene (OCH2CH2O).
Examples: Sorbitan esters (Spans), polysorbates (Tweens).
Nonionic surfactants with high hydrophiliclipophilic balance (HLB)
values are used in formulation of SMEDDS. The usual surfactant strength
ranges between 30-60% w/w of the formulation in order to form a stable
SMEDDS.Surfactants having a high HLB and hydrophilicity assist the
immediate formation of o/w droplets and/or rapid spreading of the
formulation in the aqueous media. Surfactants are amphiphilic in nature
and they can dissolve or solubilize relatively high amount of hydrophobic
drug compounds6.
18
19. Cosolvents
Organic solvents such as ethanol, propylene glycol (PG) and polyethylene glycol (PEG) are
suitable for oral delivery and they enable the dissolution of large quantities of either the
hydrophilic surfactant or the drug in the lipid base.
solvents can even act as co surfactants in microemulsion systems. Alternately alcohols and
other volatile cosolvents have the disadvantage of evaporating into the shells of the soft
gelatin or hard sealed gelatin capsules in conventional SMEDDS leading to drug
precipitation.
19
20. For the production of an optimum SMEDDS, high concentration of surfactant is required
in order to reduce interfacial tension sufficiently, which can be harmful, so co-surfactants
are used to reduce the concentration of surfactants. Co-surfactants together with the
surfactants provide the sufficient flexibility to interfacial film to take up different
curvatures required to form micro-emulsion over a wide range of composition. Selection
of proper surfactant and co-surfactant is necessary for the efficient design of SMEDDS
and for the solubilization of drug in the SMEDDS.
Co-surfactant
20
22. Mechanism
self-emulsification occurs when the entropy change that favors dispersion is greater than
the energy required to increase the surface area of the dispersion.
The free energy of a conventional emulsion formation is a direct function of the energy
required to create a new surface between the two phases and can be described by equation
Where, G is the free energy associated with the process (ignoring the free energy of
mixing), N is the number of droplets of radius, r, and Ợ represents the interfacial energy.
With time, the two phases of the emulsion will tend to separate, in order to reduce the
interfacial area, and subsequently, the free energy of the systems.
22
23. Formulation of SMEDDS
Drug has to dissolve in to oil phase(lipophilic part) of microemulsion.
Water phase is combined with the surfactant and then cosurfactant is
added slowly with constant stirring until the system is become transparent.
The amount of surfactant and co-surfactant to be added and the parent
oil phase that can be incorporated is determined with the help of pseudo
ternary phase diagram.
Ultrasonicator can finally used to achieve the desired range for the
dispersed phase.
It is then allow to equilibrate.
Gel may be prepared by the addition of the gelling agent to above
microemulsion.
23
24. Phase Behaviour
For four or more components pseudo ternary phase
diagrams are used to study the phase behaviour.
In this diagram a corner represent a binary mixture
of two components such as water/drug, oil/drug or
surfactant/co-surfactant.
A quaternary phase diagram is time consuming .
pseudo ternary phase diagram is constructed to
find out the different zones of micro emulsions.
24
25. METHOD OF PREPARATION
1. Phase Titration Method
2. Phase inversion Method
1. Phase Titration Method
dilution of an oil-surfactant mixture with water.(w/o)
dilution of a water-surfactant mixture with oil.(o/w)
mixing all components at once. In some systems, the order of ingredient addition may determine whether a
microemulsion forms.
2.Phase inversion method
Phase Inversion Temperature (PIT), i.e., the temperature range in which an o/w microemulsion inverts to a
w/o type or vice versa.
25
26. Evaluation Test
1. Thermodynamic Stability Studies
2. Dispersibility test
3. Turbidimetric Evaluation
4. Viscosity Determination
5. Droplet Size Analysis and Particle Size Measurements
6. Refractive Index and Percent Transmittance
7. Electro Conductivity Study
8. In vitro Diffusion Study
9. Drug Content
10. In vivo permeability studies
26
27. 1. THERMODYNAMIC STABILITY STUDIES
Heating cooling cycle
•Six cycles between refrigerator temperature 4⁰C and 45⁰C with storage at each temperature of not less than 48 h is
studied.
•Those formulations, which are stable at these temperatures, are subjected to centrifugation test.
Centrifugation
•Passed formulations are centrifuged at room temperature at 3500 rpm for 30 min.
•Those formulations that does not show any phase separation are taken for the freeze thaw stress test.
27
28. Freeze thaw cycle:-
Freeze was employed to evaluate the stability of formulation.
Thermodynamic stability was evaluated at difference temp. To check the effect of temp. the formulation was
subjected to freeze thaw cycle(-20ºC) for 2-3 days.
Those formulations passed this test showed good stability with no phase separation, creaming, or
cracking.
28
29. 2.DISPERSIBILITYTEST:-
The efficiency of self-emulsification of oral nano or micro emulsion is evaluated by using a standard USP
XXII dissolution apparatus for dispersibility test.
Solution Tested: 1ml
Medium: 500 ml water
Temperature: 37 ± 1 ⁰C.
Paddle speed : 50 rpm
Grade A: Rapidly forming (within 1 min) nano-emulsion, having a clear or bluish appearance.
Grade B : Rapidly forming slightly less clear emulsion having a bluish white appearance.
Grade C: Fine milky emulsion that formed within 2 min.
Grade D: Dull, grayish white emulsion having slightly oily appearance that is slow to
emulsify (longer than 2 min).
29
30. Grade E: Formulation, exhibiting either poor or minimal emulsification with large oil
globules present on the surface.
Grade A and Grade B formulation will remain as nanoemulsion when dispersed in GIT.
While formulation falling in Grade C could be recommended for SMEDDS formulation.
30
31. 3.TURBIDIMETRIC EVALUATION:-
Nepheloturbidimetric evaluation is done to monitor the growth of emulsification.
Fixed quantity of Self emulsifying system is added to fixed quantity of suitable medium (0.1N
hydrochloric acid) under continuous stirring (50 rpm) on magnetic hot plate at appropriate
temperature, and the increase in turbidity is measured, by using a turbidimeter.
However, since the time required for complete emulsification is too short, it is not possible to monitor
the rate of change of turbidity (rate of emulsification)
31
32. 4.VISCOSITY DETERMINATION:-
The SMEDDS system is generally administered in soft gelatin or hard gelatin capsules. So, it should be easily
pourable into capsules and such systems should not be too thick.
The rheological properties of the micro emulsion are evaluated by Brookfield viscometer.
The viscosities determination conform whether the system is w/o or o/w.
If the system has low viscosity then it is o/w type of the system
If the system has high viscosity then it is w/o type of the system
32
33. 5.DROPLETSIZEANALYSIS:-
The droplet size of the emulsions is determined by photon
correlation spectroscopy (which analyses the fluctuations
in light scattering due to Brownian motion of the
particles) using a Zetasizer able to measure sizes between
10 and 5000 nm.
6. REFRACTIVE INDEX AND PERCENT TRANSMITTANCE:-
Refractive index and percent transmittance prove the transparency of formulation.
The refractive index of the system is measured by refractometer by putting a drop of solution on slide
and comparing it with water (1.333).
The percent transmittance of the system is measured at particular wavelength using UV spectrophotometer by using
distilled water as blank.
If refractive index of system is similar to the refractive index of water (1.333) and formulation have percent
transmittance > 99 percent, then formulation have transparent nature. 33
34. 7.ELECTRO CONDUCTIVITY STUDY:-
The SMEDD system contains ionic or non-ionic surfactant, oil, and water.
This test is performed for measurement of the electro conductive nature of system.
The electro conductivity of resultant system is measured by electro conductometer.
In conventional SEDDSs, the charge on an oil droplet is negative due to presence of free
fatty acids.
34
35. 8.INVITRO DIFFUSION STUDY:-
In vitro diffusion studies are carried out to study the drug release behavior of
formulation from liquid crystalline phase around the droplet using dialysis
technique.
9.DRUGCONTENT:-
Drug from pre-weighed SMEDDS is extracted by dissolving in suitable
solvent. Drug content in the solvent extract was analyzed by suitable
analytical method against the standard solvent solution of drug.
35
36. Applications
SUPERSATURABLE SMEDDS (S-SMEDDS):
The high surfactant level typically present in SMEDDS formulation can lead to GI side effects and a new class of
supersaturable formulations including supersaturable SMEDDS. (S-SMEDDS) formulations have been designed and
developed to reduce the surfactant side effects and achieve rapid absorption of poorly soluble drugs
SOLID SMEDDS: SMEDDS are normally prepared as liquid dosage forms that can be administrated in soft gelatin
capsules, which have some disadvantages especially in the manufacturing process. An alternative method is the
incorporation of liquid self emulsifying ingredients into a powder in order to create a solid dosage form (tablets,
capsules). A pellet formulation of progesterone in SMEDDS has been prepared by the process of extrusion /
spheronization to provide a good in vitro drug release (100% within 30 min, T50% at 13 min). The same dose
of progesterone (16 mg) in pellets and in the SEDDS liquid formulation resulted in similar AUC, C max and
T max values2
36
38. Marketed Product of SMEDDS
Drug Name Compound Dosage form
Company Indication
Neoral® Cyclosporine A/I Soft gelatin capsule Novartis Immune suppressant
Norvir® Ritonavir Sof tgelatin capsule
Abbott Laboratories
HIV antiviral
Fortovase® Saquinavir Soft gelatin capsule
Hoffmann-La
Roche inc. HIV antiviral
Agenerase® Amprenavir Soft gelatin capsule Glaxo Smithkline HIV antiviral
Convulex® Valproic acid Soft gelatin capsule Pharmacia Antiepileptic
Lipirex® Fenofibrate Hard gelatin capsule Genus
Antihyper-lipoproteinemic
Sandimmune® Cyclosporine A/II Soft gelatin capsule Novartis Immuno suppressant
Targretin® Bexarotene Soft gelatin capsule Ligand Antineoplastic
Rocaltrol® Calcitriol Soft gelatin capsule Roche Calcium regulator
Gengraf® Cyclosporine A/III Hard gelatin capsule Abbott Laboratories Immuno suppr
38
39. Conclusion
Self-microemulsifying drug delivery system is a novel approach for the
formulation of drug compounds with poor aqueous solubility. Self micro
emulsifying drug delivery systems (SMEDDS) are mixtures of oils, Cosolvents
and surfactants, which is isotropic in nature. When introduced into aqueous
phase, it emulsifies spontaneously to produce fine o/w emulsion under
gentle agitation. SMEDDS represent a good alternative for the formulation of
poorly water soluble drugs. SMEDDS improve the dissolution of the drug due
to increased surface area on dispersion and solubility effect of surfactant.
The oral delivery of hydrophobic drugs can be made possible by SMEDDSs,
which have been shown to substantially improve oral bioavailability. By this
approach it is possible to prolong the release of drug via incorporation of
polymer in composition. SMEDDS appears to be unique &industrially feasible
approach. With future development.
39
40. Reference
1.Spernath A, Aserin A (December 2006). "Microemulsions as carriers for drugs and nutraceuticals".
Adv Colloid Interface Sci 128-130: 47–64. doi:10.1016/j.cis.2006.11.016. PMID 17229398.
2.Tang J: Self-Emulsifying Drug Delivery Systems: strategy for improving oral delivery of poorly
soluble drugs. Cur Drug Th 2007; 2: 85-93.
3.Burcham DL, Maurin MB, Hausner EA and Huang SM: Improved oral bioavailability of the
hypocholesterolemic DMP 565 in dogs following oral dosing in oil and glycol solutions. Biopharmaceutics &
Drug Disposition 1997; 18:737-742.
4. Serajuddin AT, Sheen PC, Mufson D, Bernstein DF and Augustine MA: Effect of vehicle amphiphilicity on
the dissolution and bioavailability of a poorly water soluble drug from solid dispersion. Journal of
Pharmaceutical Sciences 1988; 77:414-417.
5.Pouton CW: Effects of the inclusion of a model drug on the performance of self-emulsifying formulations.
Journal of Pharmacy & Pharmacology 1985; 37:1p.
40