Choosing The Optimal Oral Dosage Form: Liquid-filled Hard-shell Capsules Vs. Tablets

Choosing an oral solid dosage form for an API ahead of clinical trials often narrows to two options: tablets or liquid-filled hard-shell capsules. Each has a distinct profile.

Capsules suit low-dose, high-potency molecules and those with solubility, bioavailability, or stability concerns, while tablets offer higher doses, longer shelf life, and quicker throughput. The tradeoffs extend past formulation into manufacturing and the lab, from handling liquid fills to dissolution quirks such as coning or inconsistent disintegration.

This side-by-side comparison sets benefits against manufacturing and analytical challenges for both forms, and closes with a quick checklist for weighing a molecule against each. Use the comparison to test your own API against both options.