How does formulation influence oral drug absorption?

• A. Liquid formulations are slower to absorb.
• B. Tablets absorb faster than liquids.
• C. Formulation influences absorption; liquid formulations are generally absorbed more quickly than tablets.
• D. Only first-pass metabolism affects absorption.

Answer: (C)

The speed and extent of oral drug absorption are determined largely by how the drug is formulated. Liquid formulations are already in solution, so they skip the disintegration and dissolution steps that solids must undergo in the GI tract. This means the drug is available to diffuse across the intestinal mucosa more quickly, often resulting in faster absorption and onset of action. In contrast, tablets or capsules must disintegrate into granules or particles and then dissolve before absorption can occur; factors like particle size, excipients, and tablet hardness can slow this process. Because of these steps, solid dosage forms typically show slower or more variable absorption compared with liquids. Excipients can also modulate absorption by improving solubility or permeability or by delaying release. So formulation directly influences absorption, and liquid formulations are generally absorbed more quickly than tablets. First-pass metabolism occurs after absorption and affects how much drug reaches systemic circulation, not the rate of absorption itself.