Bioavailability & Routes of Administration

Bioavailability links how a drug is given to how much of it actually reaches the systemic circulation in active form. For NEET PG, this is a high-frequency, concept-driven area: first-pass metabolism, the Henderson–Hasselbalch ionisation logic, and route-specific onset/duration are repeatedly examined. Master the tables and the cut-offs and most questions become one-liners. Bioavailability (F) = the fraction of an…