Abstract
Introduction: Solid dosage forms are the most commonly used dosage form for drug delivery, and
tablets are more popular than capsules because of its lower production cost, minimal
potential of content tampering, and the large number of designs of tablets for various
applications. Aims: The aim of this work is to redesign amoxicillin hard gelatin capsules (HGCs), commonly
filled into HGCs, into tablet dosage form by employing preformulation principles.
Materials and Methods: Amoxicillin capsules were obtained from the local market for this purpose. Experiments
included studies on flowability and effect of compression force, followed by addition
of excipients, production of tablets by direct compression, and evaluation employing
standard methods of friability, hardness, disintegration, dissolution, and simulation
of release kinetics. Results: The flowability of powder was estimated using Carr's index, Hausner ratio, angle
of repose, and bulk density. The flowability was found poor for amoxicillin alone
or with starch but improved with talc. Compression force was found to be a significant
factor on friability, hardness, and disintegration. The disintegration time was rapid
in case of tablets containing starch compared to amoxicillin powder compressed alone.
It was essential to include small amounts of disintegrant and a lubricant to optimize
tablet properties. Dissolution rates for the prepared tablets were found to be acceptable,
while some formulations showed a slow release profiles corresponding to their slow
disintegration. Release kinetics was found to follow both the zero-order and matrix
models. Conclusion: Amoxicillin capsules can be modified to a tablet dosage form with simple handling
of preformulation properties.
Key-words:
Capsules - direct compression - redesign - tablets
