TataKelola dan KamSiber Kecerdasan Buatan v022.pdf
7. Routes Of Drug Administration
1. Routes of DRug
ADministRAtion
HEMED S. HEMEDHEMED S. HEMED
Royal School Of PharmacyRoyal School Of Pharmacy
Dar es salaamDar es salaam
TanzaniaTanzania
What'sapp: +255655088451What'sapp: +255655088451
20172017
2. Students Learning Tasks
By the end of this session students are
expected to be able to:
Define route of drug administration
Mention major routes of drug administration
Explain advantages and disadvantages of each
route of drug administration
06/14/17 2
3. Route of Drug AdministrationRoute of Drug Administration
• A route of drug administration is the path by
which a drug is brought into contact with the
human body.
• The choice of which route of drug
administration to be used depends on two
factors which are:
• The existing preparations of the drug
06/14/17 3
4. cont..
• The state of the patient: Emergency or the
impossibility of intake to some routes
• When administering a drug, ensure that the
pharmaceutical preparation is appropriate
for the route specified
06/14/17 4
5. Major Routes of DrugMajor Routes of Drug
AdministrationAdministration
There are four major routes of drug
administration which are commonly used:
Enteral route
Oral route
Sublingual route
Buccal route
Rectal route
06/14/17 5
7. Advantages and Disadvantages ofAdvantages and Disadvantages of
each Route of Administrationeach Route of Administration
Enteral Route
*1.Oral route: The mouth is commonly used
route for administering drugs.
Advantage of oral route administration
Most convenient
Usually least expensive- cheaper to
manufacture
Safe, does not break the skin barrier
06/14/17 HEMED S. HEMED 7
8. cont..
The gastrointestinal tract provides a huge
surface area for absorption.
The drug can be taken at home by a patient.
Portable.
No pain, easy to take.
06/14/17 HEMED S. HEMED 8
9. Disadvantage of oral routeDisadvantage of oral route
administrationadministration
Absorption can be variable and depends on the
chemical nature of the drug, e.g. its ionization,
solubility and stability
Absorption can also depend on the stomach
contents. For example the absorption of
tetracycline antibiotics is inhibited in the
presence of milk.
Drugs may affect gastric emptying and this
may affect absorption.
06/14/17 HEMED S. HEMED 9
10. Cont.….
Inappropriate for patient with nausea and
vomiting
Drug may have unpleasant taste and odor
Inappropriate if patient cannot swallow or is
unconscious (limited uses)
Drug may discolor teeth, harm teeth enamel.
Example hydrochloric acid. Drug may irritate
gastric mucosa
Some of the drug may be partially absorbed or
destroyed by the gastric juices example insulin
06/14/17 HEMED S. HEMED 10
11. *1a.Sublingual route
The medication is placed under the tongue
and allowed to dissolve slowly.
Because of the reach blood supply in this
region it results into rapid onset of the
action.
The patient is instructed not to move the
drug with the tongue nor to eat or drink
anything until the medication has
completely dissolved
06/14/17 HEMED S. HEMED 11
12. Advantage and disadvantages of
sublingual route administration
Same as oral route, plus
Drug can be administered for the local effects
More potent than oral because the drug directly
enter the circulation and bypasses the liver
Disadvantage of sublingual route administration
If swallowed drug may be inactivated by gastric
juice
Drug must remain under the tongue until dissolved
and absorbed
06/14/17 HEMED S. HEMED 12
13. *2.Buccal route
The tablet or capsule is placed in the oral
cavity between the gum and the cheek.
The client is instructed not to manipulate the
medication with the tongue; otherwise, it could
get displaced to the lingual area where it will
be more rapidly absorbed, or to the back of the
throat, where it could be swallowed.
06/14/17 HEMED S.HEMED 13
14. Advantages and disadvantages of
Buccal route
Advantage of buccal route administration
Same as sublingual route
Disadvantage of buccal route
administration
The same as sublingual plus
Dose absorbed is unpredictable
14
15. *3.Rectal Route
This means the drugs passed through the
rectum.
Rectal drugs are normally in suppository
form, although a few laxatives and
diagnostic agent are given via enema.
06/14/17 HEMED S. HEMED 15
16. Advantage of rectal route
Favor the drugs which has offensive taste or odor,
or when it can be changed by digestive enzymes.
Drug released at slow steady rate.
It avoids irritation of the upper GIT.
Is convenient and safe method of giving drugs
when the oral method is unsuitable, as when the
patient is unconscious
Venous blood from the rectum doesn’t pass to the
liver thus no first pass effects
06/14/17 HEMED S. HEMED 16
17. Disadvantage of rectal route
Absorption is slower than other routes
It is irregularly and uncompleted absorption
Causes irritation to the rectum
Inconvenient to administer
06/14/17 HEMED S. HEMED 17
18. *Inhalation Route
Inhalation is the breathing of air vapor or volatile
drugs into the lungs.
The gaseous drugs are inhaled and absorbed
through epithelium of the alveoli of the lungs.
Drug administered through this route may be for
the local or systemic effects.
Examples of the drug given by inhalation for
systemic effects are volatile anesthetics agents
such as ether, and halothane E.g. of local
inhalation is nitrate which relieve pain due to
angina pectoris
06/14/17 HEMED S. HEMED 18
19. Advantage of Inhalation route
Acts very quickly because the lungs have a
larger surface area for absorption and they are
reach supplied with blood.
Drug act at the site of action .e.g. pulmonary
diseases.
Introduces drug throughout respiratory tract
Can be used to unconscious client
06/14/17 HEMED S. HEMED 19
20. Disadvantage of inhalation route
Poor regulation of dosage
Inconvenience
Drug intended for localized effect can have
systemic effects
Of use only for respiratory system
06/14/17 HEMED S. HEMED 20
21. *Topical Route
This means application of drug locally at an
intended site such as skin, eye, ear or nose.
Smoothing and softening the dry and rough
areas of the skin.
To provide antiseptic or bacteriostatic effects
in order to inhibit the growth and
multiplication of micro organism
To provide a cleansing effects for the removal
of dirt dermis or infected tissue
06/14/17 HEMED S. HEMED 21
22. Advantages and disadvantages of
topical application
Advantage of topical applications
Provide a local effect
Few side effects
Disadvantage of topical route
Drug can enter body through abrasions and
cause systemic effects
May soil clothes
06/14/17 HEMED S. HEMED 22
23. Parenteral RouteParenteral Route
• The term parenteral “refer to method of drug
administration other than oral and topical
• It is commonly used to indicate the
administration of drugs by “Injections”
• The common types of injections includes,
intradermal, subcutaneous, intramuscular and
intravenous
06/14/17 HEMED S. HEMED 23
24. Parenteral route cont..
• Drugs given parenterally must be sterile, readily
soluble, absorbable, and non-irritating.
• Sterile aseptic technique must be used to avoid
infection.
• Accurate drug dosage, proper rate of injection and
proper site of injection are essential to avoid harm
such as tissue injuries.
• An injected drug is irretrievable, and an error in
dosage or method or site of injection is not easy
corrected.
06/14/17 HEMED S. HEMED 24
25. Intradermal
– Injection is made in the upper layer of the skin
to the dermis
– The amount of drug given is small and
absorption is slow.
– Common method used for allergy testing.
– The injections are best made with a fine, short
needle (26 gauge) and a small barrel syringe
06/14/17 HEMED S. HEMED 25
26. Advantage and disadvantages of
intradermal route of administration
Advantage of intradermal route of
administration
Absorption is slow (this is an advantage in
testing for allergies).
Disadvantage of intradermal route
Amount of drug administered must be small
06/14/17 HEMED S. HEMED 26
27. Subcutaneous route
Small amount of drug in solution are given
subcutaneously (hypodermically)
The needle is inserted through the skin with
quick movement, but the injection is made
slowly and steadily.
06/14/17 HEMED .S HEMED 27
28. Advantage and disadvantages of
subcutaneous route
Advantage of subcutaneous route
Onset of drug action is faster than oral route
Disadvantage of subcutaneous route
Involve sterile technique
More expensive than oral
Only small volume of drug can be
administered
Some drugs can irritate tissue and cause pain.
06/14/17 HEMED. S. HEMED 28
29. Intramuscular route
Injections are made through the skin and
subcutaneous tissue into the muscular tissue.
Muscle tissue has a rich blood supply,
medication moves quickly into blood vessels
to produce more rapid onset of action than oral
The anatomical structure of the muscle permits
this tissue to receive a larger volume of
medication. e.g. deltoid and biceps muscle
should receive a maximum of 3ml
06/14/17 HEMED. S. HEMED 29
30. Advantage of intramuscular
injection
Pain from irritating drug is minimized.
Can administer larger volume than
subcutaneous
This injection is technically easier than IV.
The gastrointestinal tract and first pass
metabolism are avoided
06/14/17 HEMED S. HEMED 30
31. Disadvantage intramuscular
injections
Break skin barrier
Can produce anxiety
Injections can be painful.
Self administration is difficult.
Rarely, abscesses can form at the site of
injection.
The needle may puncture a small blood vessel
and cause bruising of the skin.
06/14/17 HEMED. S. HEMED 31
32. Intravenous injections (IV)
Medications and fluids are administered
directly into the blood stream and immediately
available for use by the body.
The IV route is used when a very rapid onset
of action is desired.
It requires skill and sterile asepsis, and the
drug must be highly soluble and capable of
withstanding sterilization.
IV route is of great value in emergencies.
06/14/17 HEMED S. HEMED 32
33. Advantage of IV routes
A rapid onset of action
The entire injected dose is almost instantly
available, since it bypasses the gastrointestinal
tract and first pass metabolism.
A lower dose is administered than if the drug
is given orally.
Administration is useful for drugs that are
irritant when administered intramuscularly
06/14/17 HEMED. S. HEMED 33
34. Disadvantage of IV routes
Break skin barrier
Limited to highly soluble drugs
Drug distribution inhibited by poor circulations
The drug has to be administered by trained
person.
Involuntary injection into an artery can cause
arterial spasm with resulting tissue damage.
Accidental overdose can have serious
consequences.
06/14/17 HEMED. S. HEMED 34
35. Key Points
A route of drug administration is the path by
which a drug is brought into contact with the
human body.
The choice of which route of drug administration
to be used depends on two factors
There are four major routes of drug
administration which are commonly used. These
are enteral, inhalation, parenteral and topical
routes
06/14/17 HEMED S. HEMED 35