Pharmacology The 5a reductase inhibitor that has been found to be effective both in benign prostatic hyperophy and male pattern baldness is: A Flutamide B Finasteride C Prazosin D Minoxidil 💡 Explanation The 5a reductase inhibitor that has been found to be effective both in benign prostatic hyperophy and male pattern baldness is: ✓ Correct Answer: B. Finasteride