A young woman who is taking rifampicin along with oral contraceptive pills (OCPs) becomes pregnant. What is the most likely reason for this contraceptive failure?

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Rifampicin induces liver enzymes, leading to increased breakdown of OCPs.Reduced absorption of oral contraceptive pills.Blockage of the fallopian tubes.Enhanced elimination of oral contraceptive pills from the body.None of the above.

Explanation

Rifampicin is known to induce hepatic enzymes, which accelerates the metabolism of oral contraceptive pills, thereby lowering their effectiveness and increasing the risk of unintended pregnancy.