This document provides an overview of key concepts in medicinal chemistry. It defines medicinal chemistry as concerning the discovery, development, and interpretation of biologically active compounds at the molecular level. It then discusses the relationships between organic chemistry, medicinal chemistry, and pharmaceutical chemistry. The rest of the document covers topics like drug nomenclature, classification, pharmacology principles of drug action, toxicology, and assays.
This is the presentation for B. Pharm. IV semester students.
It includes Introduction of Medicinal Chemistry, History and Development of Medicinal Chemistry
This is a ppt on Medicinal chemistry, just made to help out and give the students of CLASS XI studying in CBSE about what Medicinal Chemistry is >>Please do feedback in the comments part
Unit i.Optical Isomerism as per PCI syllabus of POC-III Ganesh Mote
Unit I optical isomerism which is included in PCI syllabus of Sem IV of POC-III subject
This Unit Includes all points of Unit I such as nomenclature, R& S, d&l, D& L isomerism, Meso compounds, diastereomers, chirality, resolution of racemic mixture, enantiomers, Asymmetric synthesis,
This is the presentation for B. Pharm. IV semester students.
It includes Introduction of Medicinal Chemistry, History and Development of Medicinal Chemistry
This is a ppt on Medicinal chemistry, just made to help out and give the students of CLASS XI studying in CBSE about what Medicinal Chemistry is >>Please do feedback in the comments part
Unit i.Optical Isomerism as per PCI syllabus of POC-III Ganesh Mote
Unit I optical isomerism which is included in PCI syllabus of Sem IV of POC-III subject
This Unit Includes all points of Unit I such as nomenclature, R& S, d&l, D& L isomerism, Meso compounds, diastereomers, chirality, resolution of racemic mixture, enantiomers, Asymmetric synthesis,
This powerpoint presentation will help to know about introduction of bioisosterism by Biotechnology point of view. Hope this powerpoint presentation will your reference.
THE PRODRUG DESIGNING FOR NEW SELECTION AND FORMULATION OF DRUG COMPATIBLE WITH API I.E. ACTIVE PHARMACUTICAL INGREDIENT, AND ITS EFFECT WHICH SHOULD BE 0. THE DRUG COMBINED WITH API AND AVILABLE IN MARKET AND DRUGS NEED TO BE COMBINE ARE ALSO DISCUSSED WITH ITS STRUCTURE AND SAR, AND COVERED AS PER THE SYLLABUS OF PCI.
ANTI HYPERTENSIVE AGENTS [MEDICINAL CHEMISTRY] BY P.RAVISANKAR, HYPERTENSION,...Dr. Ravi Sankar
ANTI HYPERTENSIVE AGENTS [MEDICINAL CHEMISTRY] BY P.RAVISANKAR, HYPERTENSION,TYPES,CAUSES OF HYPERTENSION, CLASSIFICATION, MECHANISM OF ACTION, SAR, ACE INHIBITORS, ARB , DIURETICS(WATER PILLS), TIPS TO STOP SILENT KILLER.
BY P. RAVISANKAR, VIGNAN PHARMACY COLLEGE, VADLAMUDI, GUNTUR,A.P, INDIA.
DEFINITION:
The ability of a chemical compound to elicit a pharmacological/ therapeutic effect is related to the influence of various physical and chemical (physicochemical) properties of the chemical substance on the bio molecule that it interacts with.
1)Physical Properties
Physical property of drug is responsible for its action 2)Chemical Properties
The drug react extracellularly according to simple chemical reactions like neutralization, chelation, oxidation etc.
Various Physico-Chemical Properties are,
Solubility Partition Coefficient
Dissociation constant Hydrogen Bonding Ionization of Drug Redox Potential Complexation Surface activity Protein binding Isosterism
1. Solubility:
• The solubility of a substance at a given temperature is defined as the concentration of the dissolved solute, which is in equillibrium with the solid solute.
• Solubility depends on the nature of solute and solvent as well as temperature , pH & pressure.
• The solubility of drug may be expressed in terms of its affinity/philicity or repulsion/phobicity for either an aqueous or organic solvent.
The atoms and molecules of all organic substances are held together by various types of bonds (e.g. hydrogen bond, dipole –dipole, ionic bond etc.)
These forces are involved in solubility because it is the solvent-solvent, solute-solute, solvent-solute interactions that governs solubility.
Methods to improve solubility of drugs
1) Structural modification (alter the structure of molecules) 2) Use of Cosolvents (Ethanol, sorbitol,PPG,PEG)
3) Employing surfactants 4) Complexation
Importance of solubility
1. Solubility concept is important to pharmacist because it govern the preparation of liquid dosage form and the drug must be in solution before it is absorbed by the body to produce the biological activity.
2. Drug must be in solution form to interact with receptors.
Biphenyl derivatives & Atropisomerism:Optical activity in Biphenyls, Stereochemistry of biphenyl derivatives, rules and assigning RS configuration to biphenyls
A brief description of some important topics of pharmaceutical chemistry like lead compounds bioactive compounds and prodrugs &soft drugs which are the base of pharmaceuticals.
Phsicochemical properties according to pci syllubus.
The ability of a chemical compound to elicit a pharmacological/ therapeutic effect is related to the influence of various physical and chemical (physicochemical) properties of the chemical substance on the bio molecule that it interacts with.
1)Physical Properties : Physical property of drug is responsible for its action
2)Chemical Properties :The drug react extracellularly according to simple chemical reactions like neutralization, chelation, oxidation etc.
General Pharmacology Lecture Slides on introduction to Pharmacology by Sanjaya Mani Dixit Assistant Professor of Pharmacology at Kathmandu Medical College
This powerpoint presentation will help to know about introduction of bioisosterism by Biotechnology point of view. Hope this powerpoint presentation will your reference.
THE PRODRUG DESIGNING FOR NEW SELECTION AND FORMULATION OF DRUG COMPATIBLE WITH API I.E. ACTIVE PHARMACUTICAL INGREDIENT, AND ITS EFFECT WHICH SHOULD BE 0. THE DRUG COMBINED WITH API AND AVILABLE IN MARKET AND DRUGS NEED TO BE COMBINE ARE ALSO DISCUSSED WITH ITS STRUCTURE AND SAR, AND COVERED AS PER THE SYLLABUS OF PCI.
ANTI HYPERTENSIVE AGENTS [MEDICINAL CHEMISTRY] BY P.RAVISANKAR, HYPERTENSION,...Dr. Ravi Sankar
ANTI HYPERTENSIVE AGENTS [MEDICINAL CHEMISTRY] BY P.RAVISANKAR, HYPERTENSION,TYPES,CAUSES OF HYPERTENSION, CLASSIFICATION, MECHANISM OF ACTION, SAR, ACE INHIBITORS, ARB , DIURETICS(WATER PILLS), TIPS TO STOP SILENT KILLER.
BY P. RAVISANKAR, VIGNAN PHARMACY COLLEGE, VADLAMUDI, GUNTUR,A.P, INDIA.
DEFINITION:
The ability of a chemical compound to elicit a pharmacological/ therapeutic effect is related to the influence of various physical and chemical (physicochemical) properties of the chemical substance on the bio molecule that it interacts with.
1)Physical Properties
Physical property of drug is responsible for its action 2)Chemical Properties
The drug react extracellularly according to simple chemical reactions like neutralization, chelation, oxidation etc.
Various Physico-Chemical Properties are,
Solubility Partition Coefficient
Dissociation constant Hydrogen Bonding Ionization of Drug Redox Potential Complexation Surface activity Protein binding Isosterism
1. Solubility:
• The solubility of a substance at a given temperature is defined as the concentration of the dissolved solute, which is in equillibrium with the solid solute.
• Solubility depends on the nature of solute and solvent as well as temperature , pH & pressure.
• The solubility of drug may be expressed in terms of its affinity/philicity or repulsion/phobicity for either an aqueous or organic solvent.
The atoms and molecules of all organic substances are held together by various types of bonds (e.g. hydrogen bond, dipole –dipole, ionic bond etc.)
These forces are involved in solubility because it is the solvent-solvent, solute-solute, solvent-solute interactions that governs solubility.
Methods to improve solubility of drugs
1) Structural modification (alter the structure of molecules) 2) Use of Cosolvents (Ethanol, sorbitol,PPG,PEG)
3) Employing surfactants 4) Complexation
Importance of solubility
1. Solubility concept is important to pharmacist because it govern the preparation of liquid dosage form and the drug must be in solution before it is absorbed by the body to produce the biological activity.
2. Drug must be in solution form to interact with receptors.
Biphenyl derivatives & Atropisomerism:Optical activity in Biphenyls, Stereochemistry of biphenyl derivatives, rules and assigning RS configuration to biphenyls
A brief description of some important topics of pharmaceutical chemistry like lead compounds bioactive compounds and prodrugs &soft drugs which are the base of pharmaceuticals.
Phsicochemical properties according to pci syllubus.
The ability of a chemical compound to elicit a pharmacological/ therapeutic effect is related to the influence of various physical and chemical (physicochemical) properties of the chemical substance on the bio molecule that it interacts with.
1)Physical Properties : Physical property of drug is responsible for its action
2)Chemical Properties :The drug react extracellularly according to simple chemical reactions like neutralization, chelation, oxidation etc.
General Pharmacology Lecture Slides on introduction to Pharmacology by Sanjaya Mani Dixit Assistant Professor of Pharmacology at Kathmandu Medical College
presented by: Miss Prajakta D. sawant, Lecturer at Genesis Institute of Pharmacy, radhanagari.
SECOND YEAR DIPLOMA IN PHARMACY. PHARMACOLOGY AND
TOXICOLOGY(0813).
This presentations includes information about definition of pharmacology, history, nature and sources of drugs, different terms used in Pharmacology, Essential Drugs concept, Routes of Drug Administration, and Agonist and Antagonist.
It is essential because it allows several thousand of drugs to be reduced to a manageable number of group.
There is no uniform or homogeneous system of classifying drugs that suits all purposes.
Drugs are classified according to the convenience of the person discussing them Chemist, Pharmacist, Pharmacologist and Clinician.
Theories of coordination compounds, CFSE, Bonding in octahedral and tetrahedral complex, color of transition metal complex, magnetic properties, selection rules, Nephelxeuatic effect, angular overlap model
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
1. Prepared By
Dr. Krishnaswamy. G
Faculty
DOS & R in Organic Chemistry
Tumkur University
Tumakuru
For
I M.Sc., I Semester
DOS & R in Organic Chemistry
Tumkur University
Tumakuru
MEDICINAL CHEMISTRY
2. MEDICINAL CHEMISTRY
Chemical compounds
which shows
Physiological /
biological /
therapeutic action
Medicine or Drug
Physiological /
biological /
therapeutic action of
any compounds
depends on structure
and its arrangements
‘Medicinal chemistry concerns the discovery, the development,
the identification and the interpretation of the mode of action of biologically
active compounds at the molecular level.
IUPAC Definition
4. Name The word Drug derived from Greek
“Pharmacon” means drug
The word Medicine derived from Latin
“Medicus” means healing
Definition Substances which can change the
physical and physiological state -
Drug
Substances that have definite form and
therapeutic use for treatment -
Medicine
Drug is a substance which cures the
disease but is habit forming, causes
addiction and has serious side
effects.
Medicine is a chemical substance which
cures the disease, has negligible toxicity
and does not cause any addiction
Amount Drug does not have any definite form
and dose.
Medicine has definite form and dose.
Relation with API Drug = API (Active Pharmaceutical
Ingredient)
Medicine = API ± Excipients
Potency Drugs are active potent compound. Medicines are administrative form of
drug.
Source Plants, animals, microorganisms,
synthetic, minerals
Drug and excipient.
Comparison All drugs are not medicines All medicines are drugs
Selectivity Non selective Selective
Example Paracetamol Napa (paracetamol) 500 mg tablet
Difference between Drug and Medicine
5. Disintegration of
dosage form.
Dissolution of
active substance
Absorption
Distribution
Metabolism
Excretion
Drug-receptor
interaction in
target tissue
Pharmaceutical Phase
Pharmacokinetic Phase
Pharmacodynamic Phase
Drug available
for absorption
Drug available
for action
Three Phases of Drug action
DOSE
6. Pharmacology Pharmacon logos
+
=
Drug To study
Study of Drug, Drugs effect on body and Body response for the Drug.
Pharmacology Pharmacokinetic Pharmacodynamics
+
=
7. The purpose of studying pharmcokinetics and
pharmacodynamics is to understand the drug action,
therapy, design, development and evaluation.
Pharmacokinetics is what the Body Does To The Drug
like how the drug is absorbed, Distributed,
Metabolized and Excreted by the body – Drug
Disposition.
Pharmacodynamics is what the Drug Does To The
Body which may be the therapeutic effect or the
adverse side effect – Drug Action.
8. Nomenclature of Drugs
Drugs have three or more names.
These names are the following:
a) Code number or code designation;
b) Chemical name;
c) Proprietary, trivial, brand or trade name;
d) Nonproprietary, generic, official, or common name; and
e) Synonym and other names.
9. The code number is usually formed with the initials of the laboratory or the
chemist or the research team that prepared or tested the drug the first time,
following by a number. It does not identify the chemical nature or structure
of the drug. Its use is discontinued as soon as an adequate name is chosen.
The chemical name is the only one that describes unambiguously the
chemical structure of a drug, identifying it fully and exactly. It is given
according to rules of nomenclature of chemical compounds. Since the
chemical name is sometimes very elaborate, it is not suitable for routine
usage.
a) Code number or code designation;
b) Chemical name;
10. The proprietary name is the individual name selected and used by
manufacturers. If a drug is manufactured by more than one company
c) Proprietary, trivial, brand or trade name;
The nonproprietary name refers to the common, established name by
which a drug is known as an isolated substance, irrespective of its
manufacturer. It is chosen by official agencies, such as the U.S. Adopted
Names (USAN) Council, the American Pharmaceutical Association, and
other.
d) Nonproprietary, generic, official, or common name;
11. Synonyms are names given by different manufacturers to the same drug or
old nonproprietary names. Some drugs may have several names.
e) Synonym and other names.
EXAMPLE: Paracetamol
Chemical Name: N-(4-hydroxyphenyl)acetamide
Non Proprietary Name:
British Approved Name (BAN): Paracetamol
United States Adopted Name (USAN): Acetaminophen
Proprietary Name:
Panadol, Calpol, Adol
Official Name:
Acetaminophen
12. Classification of Drugs
Drugs can be classified according to various criteria. Usually,
they are classified according to
a) Chemical Nature,
b) Source,
c) Target organ / Site of Action,
d) Mechanism of action and
e) Therapeutic use.
13. Classification based on Chemical Nature
Inorganic Drugs Organic Drugs
Metals and their salts
(FeSO4, MgSO4)
Non metals includes
sulphur
Alkaloids
(Atropine, Morphine)
Proteins
(Insulin, Oxytocin)
Esters, Amide, Alcohol
14. Classification based on Source
Plants (Morphine,
Atropine)
Animals (Insulin)
Microorganism
(Pencillin)
Mineral
(Sodium chloride)
Sulphoamides Amoxicillin, Ampicillin
Natural source Synthetic source Semi Synthetic source
15. Classification based on Target organ / Site of Action
Drug acting on CNS (Diazepam)
Drug acting on Respiratory System (Bromhexamine)
Drug acting on GIT (Omeprazole)
Drug acting on Urinary system (Magnesium
sulphate)
Drug acting on Reproductive System (Oxytocin)
16. Classification based on Mechanism of action
Inhibitor of Bacterial Cell wall synthesis (Pencillin)
Inhibitor of Bacterial protein synthesis (Tetracycline)
Calcium Channel Blocker (Nifedipine)
17. Classification based on Therapeutic use
Antimicrobials – Drugs which are used to cure diseases caused by microbes
or microorganisms such as bacteria, fungi, virus etc.
Anti-infectives
Antibacterials – Drugs which are used to cure diseases caused by bacteria.
Antifungals – Drugs which are used to cure diseases caused by fungi.
HO
NH2 H
N
O N
S
O
OH
O
Chemical structure of Amoxicillin
Chemical structure of Fluconazole
18. Antitubercular - Drug used to treat tuberculosis caused by Mycobacterium
tuberculosis.
N
H
N
O
NH2 Chemical structure of Isoniazid
Antivirals - Drug used to prevent and treat HIV/AIDS .
Chemical structure of Abacavir
19. Antibiotics – Chemical substance which in low concentration either kill or
inhibit the growth of microorganisms intervening in their metabolic process.
They are classified into two classes
(1) Bactericidal which is used to kill bacteria
(2) Bacteriostatic which is used to inhibit the growth of bacteria.
N
N
O
F
OH
O
HN
Chemical structure of Ciprofloxacin
20. Analgesics – Drugs which reduce pain without causing impairment of consciousness,
mental confusion of disorder of the nervous system.
These are classified into following two categories
Non-narcotic Analgesics: Aspirin and paracetamol are the most important examples
of non-addictive analgesics.
Narcotic Analgesics: Drugs which when administered in small doses relieve pain and
produce sleep are called narcotics. However, in large doses, they produce laziness,
coma and may ultimately cause death.
Central Nervous System Drugs
21. Antiseptics and Disinfectants
The chemical substances which prevent the growth of micro-organisms or may
even kill them when applied to living tissues like skin, are called Antiseptic.
Examples of Antiseptic:
Dettol: It is a mixture of chloroxylenol and terpineol in a suitable solvent. It is widely
used for cuts, wounds etc.
Iodine: It is used as a tincture of iodine(a 2-3% sol. of iodine in alcohol and water)
22. The chemical substances which are used to kill harmful micro-organisms but are
not safe to be applied to the living tissues are called Disinfectants.
Examples of Disinfectants:
1% solution of phenol is a disinfectant.
Example: A 0.2% solution of phenol is used as an antiseptic but 1% solution of
phenol is used as a disinfectants.
23. Antacids: Excess production of Hydrochloric acid in our stomach cause
irritation and pain. Sometimes in severe cases, ulcers can also be produced
in the stomach. Hence, ‘the substances which neutralize the excess acid
and raise the pH to an appropriate level in stomach are called Antacids’.
Examples: Sodium Bicarbonate, magnesium hydroxide etc.
Structure of drug Cimetidine
The secretion of pepsin and hydrochloric acid is stimulated by Histamine.
Therefore, the drug cimetidine was developed to stop the interaction of histamine
with the receptors that are present in the stomach wall. As a result, less
hydrochloric acid is released and the problem of hyperacidity can be solved.
24. Anti-cancer drugs also called antineoplastic drug, any drug that is effective in the
treatment of malignant, or cancerous, disease.
Cis platin (Cis-dichlorodiammineplatinum(II)) is alkylating agent binds to DNA and
leads to cancer cell death
Pt
NH3
NH3
Cl
Cl
Chemical structure of Cisplatin
N
H
NH
F
O
O
Chemical structure of 5-Fluorouracil
Antineoplastic agent used to treat various kinds of cancer namely colorectal,
breast, stomach, pancreatic and cervical.
25. OH
O
Chemical structure of Ibuprufen
Anti-inflammatory drugs also known as Nonsteroidal anti-
inflammatory drugs (NSAIDs) block the COX enzymes and reduce prostaglandins
throughout the body. As a consequence, ongoing inflammation, pain, and fever
are reduced.
Tranquilizers also known as antidepressant drugs used for the treatment of
stress, fatigue, mild and severe mental diseases.
Noradrenaline is one of the several neurotransmitters which play an important
role in mood change. If the level of noradrenaline in the body is low, then the
message transfer process becomes slow and the person suffers depression.
Chemical structure of Iproniazid
26. Diuretics also called water pills medication designed to increase the amount of
water and salt expelled from the body as urine.
The most common condition treated with diuretics is high blood pressure.
The drugs reduce the amount of fluid in your blood vessels, and this helps
lower your blood pressure.
Antimalarial drugs used to treat malaria caused by Plasmodium species.
Chemical structure of Chloroquine
Chemical structure of Furosemide
27. Drug can produce toxic / adverse effect in addition to
therapeutic / pharmacological effect.
No drug is free from side effects
With some drugs toxic effect may be minor while with certain
drugs there may be serious problems.
Toxicology: Branch of Science deals with the amount of an
agent that causes an adverse action in living system.
In order to get an idea about the safety of drugs therapeutic
index can be used.
28. THERAPEUTIC INDEX
THERAPEUTIC INDEX =
Dosage of a drug that cause a toxic / lethal effect
Dosage of a drug that causes therapeutic effect
THERAPEUTIC INDEX =
LD 50
ED 50
THERAPEUTIC INDEX =
TD 50
ED 50
Animals Humans
DOSE: Amount of drug administered
29. Median Lethal Dose(LD 50)
Dose which kills 50 % or half the population of animal
tested.
Median Toxic Dose(TD 50)
Dose which kills 50 % or half the population of humans
tested.
Dose which produce the desired response in 50 % or
half the population of animal / humans tested.
Median Effective Dose(ED 50)
30. Higher the therapeutic index = Safer is the drug
Therapeutic index (> 10) = Safe drug
Therapeutic index (4 – 10) = Relatively safe
Therapeutic index (2 – 4) = Toxic
Therapeutic index (< 2) = Highly Toxic
31. THERAPEUTIC INDEX
ED 50 LD / TD 50
%
Response
%
Death
50
100
50
100
THERAPEUTIC EFFECT
TOXIC EFFECT
Dose (mg/kg)
Drug Safety - THERAPEUTIC INDEX
32. Half Maximal Effective Concentration (EC 50)
The drug concentration producing 50% of a maximal
effect
Example: Administering a 1000 mg dose of acetaminophen
(ED50) orally will result in a plasma concentration of 15 mg/ml
(EC50), which produces effective pain relief in 50% of adult
patients.
33. Half Maximal Inhibitory Concentration (IC 50)
Drug needed to inhibit a given biological process or biological
component by 50%.
-log (IC 50)
pIC 50 =
(IC 50) values can be expressed in terms of pIC 50
34. An assay is a process of analyzing
a substance to determine its composition or quality
The biological or pharmacological potency of drug
1) Chemical assay – Chemical methods are employed for
estimation of the concentration.
Qualitative: Extraction, Distillation, Precipitation and other
physicochemical methods.
Quantitative: Volume or Weight
Types of assay
35. 2) Bio assay – an analytical method to determine concentration
or potency of a substance by its effect on living cells or tissues.
Chemical assay
More Precise
Less time consuming
Active constituent and
structure fully established
Less sensitive
Bio assay
Less Precise
More time consuming
Active constituent and
structure not known
More sensitive
36.
37. Immuno assay – an analytical method which uses antibodies as
reagent to quantitate or detect specific analyte.
Antibody and antigen complexes used as means of measurable
results.
38. Metabolites Antimetabolites
Definition Any substances produced by
or taking part in a metabolic
reaction Metabolites
Any substances (medicine) that
compete with or inhibits the
normal metabolic process
often by acting analogue of an
essential metabolite –
Antimetabolites
Example Uracil 5-Fluorouracil
Structure
Role Thymidylate synthetase (TS)
enzyme for DNA synthesis
Inhibits Thymidylate synthetase
(TS) enzyme for DNA synthesis
40. PHARMACOPHORE
“An ensemble of steric and electronic features that is necessary
to ensure the optimal supramolecular interaction with a
specific biological target and to trigger or block its biological
response”.
42. In Drug Design the term pharmacophore refers to a set of
features that is common to a series of active molecules.
Hydrogen bond donors and acceptors, positively and
negatively charged group and hydrophobic region are typical
features. Such features are referred as pharmacophoric groups