Pharmacology A young lady taking rifampicin and OCP together become pregnant, most probable cause is A Rifampicin causes hepatic enzyme induction and increase metabolism of OCP's B Decreased absorption of OCP's C Obstruction of fallopian tubes D Increase excretion of OCP's 💡 Explanation A young lady taking rifampicin and OCP together become pregnant, most probable cause is ✓ Correct Answer: A. Rifampicin causes hepatic enzyme induction and increase metabolism of OCP's