2. Excipients Interaction
Excipients play an important role in formulating a dosage
form. These are ingredients which along with active
pharmaceutical ingredients make up the dosage forms.
Excipients act as protective agents, bulking agents and
can also be used to improve bioavailability of drug.
Excipients as like other active pharmaceutical
ingredients need to be stabilized and standardized.
3. Excipients Interaction
An excipient is an inactive substance formulated alongside the
active ingredient of a medication, for the purpose of bulking-up
formulations that contain potent active ingredients”.
The resultant biological, chemical and physical properties of the
drug product are directly affected by the excipient chosen, their
concentration and interactions with the API:
Consistency of drug release and bioavailability
Stability including protection from degradation
Ease of administration to the target patient population(s) by sthe
intended route
4. Ideal properties of Excipient
No interaction with drug
Cost effective
Pharmacologically inert
Stable for handling
5. Drug excipient interaction
In pharmaceutical dosage forms the active
pharmaceutical ingredients are in intimate
contact with the excipient which are greater
quantity excipient and drugs may have certain
incompatibility which lead to drug excipient
interaction
6. Types of drug excipient Interactions
Physical interactions.
Chemical interactions.
Biopharmceutical interactions.
Excipient –Excipient interactions
7. Physical interactions
Physical interactions alter physical properties of
dosageform like the rate of dissolution , dosage
uniformity ,etc.
Physical interactions do not involve chemical changes
thus permitting the components in the formulation to
retain their molecular structure .physical interactions are
difficult to detect
12. Biopharmaceutical interactions
These are the interaction observed after
administration of the medication.
Interaction within the body is between medicine
and body fluids which influence the rate of
absorption .
All excipient physiological way when they are
administered along with active pharmaceutical
ingredients.
13. Biopharmaceutical interactions
Premature breakdown of enteric coat-The enteric
coating polymers like cellulose acetate phthalate and
hydroxyl propyl cellulose acetate phthalate.
Are soluble more at basic pH, but antacids raise pH of
stomach resulting in breakdown of the enteric coat in
stomach and release of active pharmaceutical
ingredient in stomach itself , which results in degradation
of drug in stomach.
In case of NSAID’s premature breakdown of enteric coat
may cause side effects like gastric bleeding
14. Biopharmaceutical interactions
Many of the excipients like Sorbitol ,xylitol
have tendency to increase the
gastrointestinal motility thus reducing the
time available for absorption of drugs like
metoprolol.
15. Excipient –excipient interaction
Excipient –excipient interaction though
observed very rarely. These are prime
importance in determining the stability of the
dosage forms excipient –excipient interactions
can be undesirable as well as some interactions
are used in the formulations to get the desired
product attributes