Norethisterone and Rifampicin: Drug Interaction Guide
Quick answer: This is a major interaction — avoid combining Norethisterone and Rifampicin unless specifically directed by your doctor.
How Norethisterone interacts with Rifampicin
Rifampicin strongly induces CYP3A4 and other metabolic pathways, substantially lowering norethisterone exposure and reducing contraceptive efficacy.
What you should do
Do not rely on norethisterone contraception during rifampicin treatment. Use a contraceptive method unaffected by enzyme induction and continue additional precautions for the recommended period after rifampicin stops.
Key facts
Severity
Major — avoid combination
Mechanism
Rifampicin strongly induces CYP3A4 and other metabolic pathways, substantially lowering norethisterone exposure and redu...
Action
Do not rely on norethisterone contraception during rifampicin treatment. Use a contraceptive method unaffected by enzyme...
Frequently asked questions
Can I take Norethisterone and Rifampicin together?
No — this combination should generally be avoided. Do not rely on norethisterone contraception during rifampicin treatment. Use a contraceptive method unaffected by enzyme induction and continue additional precautions for the recommended period after rifampicin stops.
What is the severity of this interaction?
The interaction between Norethisterone and Rifampicin is classified as Major — avoid combination. Rifampicin strongly induces CYP3A4 and other metabolic pathways, substantially lowering norethisterone exposure and reducing contraceptive efficacy.
What should I do if I'm prescribed both?
Do not rely on norethisterone contraception during rifampicin treatment. Use a contraceptive method unaffected by enzyme induction and continue additional precautions for the recommended period after rifampicin stops. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.