Definition:
Capsule: Capsules are a solid unit dosage form in which the drug substances are enclosed in a water soluble shell or an envelope.
Advantages of capsules:
1. Drugs having unpleasant odor and taste can be administered by enclosing them in a shell.
2. They are smooth, become slippery when moist and can be easily swallowed.
3. Economical.
4. Easy to handle and carry.
5. Capsules are made from gelatin and hence they are therapeutically inert.
6. Attractive.
7. Microencapsulation provides sustained release dosage form.
Disadvantages: (0.5 X 2 = 1M)
1. Hygroscopic drugs cannot be filled in capsule as they make the shell very brittle.
2. Concentrated preparation which needs dilution before administration cannot be given in form of capsule.