Suppositories are solid forms that are inserted into body orifices where they melt, soften, or dissolve to exert their effects. The common routes for administration include rectal, vaginal, and occasionally urethral. The shape and size of suppositories are critical; they must allow easy insertion into the orifice without causing undue distension and must be capable of being retained for the required duration.
1. How do fatty (oleaginous) bases and water-soluble bases differ in their physical properties and drug release behavior in suppositories?
2. In which scenario is a suppository most appropriately used in clinical practice?
3. What is the primary cause of the systemic effect advantage of the rectal route of drug administration?
Suppository — definition?
Solid dosage form inserted into body orifices.
Main routes for suppositories?
Rectal, vaginal, urethral.
Suppositories — primary use?
Promote defecation, deliver drugs locally/systemically.
Advantages of rectal route?
Bypasses first-pass metabolism, protects drugs, suitable for children/unconscious.
Disadvantages of suppositories?
Fixed doses, variable effectiveness, limited absorption, not for narrow-margin drugs.
Local action of suppositories?
Acts directly at the application site, e.g., hemorrhoid relief.
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