A 30-year-old woman on combined oral contraceptive pill is prescribed rifampicin for TB. What is the main interaction?...

Question

A 30-year-old woman on combined oral contraceptive pill is prescribed rifampicin for TB. What is the main interaction?

Accepted Answer

Rifampicin reduces effectiveness of oral contraceptives

Answer

Rifampicin increases risk of thromboembolism

Answer

No significant interaction

Answer

Rifampicin causes oestrogen toxicity

Answer

Rifampicin delays pill absorption but no effect on efficacy

ukmla MCQ (SBA): Pharmacology & Prescribing