Hard gelatin capsules are solid dosage forms where medicaments are enclosed in a water-soluble, biodegradable gelatin shell. They have several advantages for oral administration like easy swallowing and masking of unpleasant tastes. Filling hard capsules involves separating the capsule body and cap using a filling machine, filling the body with powder, and rejoining the cap. Quality tests include weight variation, content uniformity, dissolution, and disintegration testing. Capsules must be stored in a cool, dry place to maintain the proper moisture content of the gelatin shells. Modern high-speed machines can fill over 100,000 capsules per hour.