HIV/AIDS and Antiretroviral Therapy Practice Test 2026 – Complete Exam Prep

Bioavailability is the fraction of an administered dose that reaches the systemic circulation. For Cogentin, the value you see typically refers to the parenteral routes (intramuscular or intravenous), which bypass the liver and result in near-complete absorption. In clinical practice, Cogentin given by IM or IV shows about 95% bioavailability, meaning most of the dose becomes available systemically. Oral administration, in contrast, undergoes first-pass metabolism and absorption that can lower systemic exposure, so its oral bioavailability would be lower than this value. Thus, 95% reflects the high, near-complete absorption characteristic of the parenteral route, making it the best answer.