THE SHORT VERSION
- Pill users need additional barrier protection or a non-oral method at specified times.
- Vomiting and diarrhoea can create a separate contraception problem.
Put the precaution dates in your calendar
MHRA and CoSRH advice is to use barrier contraception, such as condoms, for four weeks after starting tirzepatide and four weeks after each increase, or switch to a non-oral method. This matters for both combined and progestogen-only pills.
Ask the contraception service when a new method becomes effective so you avoid a gap. Record the dates alongside prescription changes. Continuing your usual pill alone does not provide the extra precaution.
Act promptly if protection may have failed
If you have vomiting or severe diarrhoea, check the instructions for your exact contraceptive pill and seek advice about missed-pill precautions. Timing differs between pill types.
If you had sex without reliable protection, contact a pharmacist or sexual-health service promptly about emergency contraception. Tell them you take tirzepatide, when you last took your pill and whether you have been sick. Do not wait for your next weight-management review. If pregnancy is possible, arrange a test and seek advice about treatment rather than assuming changed periods explain it.
Sources you can check
- CoSRH/FSRH: GLP-1 medicines and oral contraception
- MHRA: GLP-1 medicines safety guidance
- Mounjaro KwikPen: current UK patient leaflet
Editorial presentation updated 24 October 2026. This is general information, not individual medical advice or a claim of independent clinical review. Read the linked source and the leaflet supplied with your medicine for the full context. Suggest a correction.