question: A 28 year old lady on OCPs takes tetracycline for periodontitis and become pregnant after 2 months. This is because?
opa: Tetracyclines induce metabolism of OCPs
opb: Tetracycline inhibits enterohepatic circulation causing increased excretion of OCPs
opc: Tetracycline inhibits metabolism of OCPs
opd: Tetracycline displaces OCPs from plasma protein binding site