Accidentally Took a Double Dose of Mounjaro — What Should You Do?

Mounjaro (tirzepatide) is a once-weekly prescription-only injection. Each pen delivers a precise dose — commonly ranging from 2.5 mg up to 15 mg depending on where you are in your treatment — and that schedule is designed and overseen by your prescriber. Taking two doses in a short period, such as an accidental double dose of Mounjaro 5 mg or any other strength, is outside the intended schedule and may increase the likelihood of side effects such as nausea, vomiting, diarrhoea, or dizziness.

Because the right response depends on your individual health history, current dose strength, and timing, there is no single general answer that applies to everyone. Your prescriber or doctor can review your specific situation and advise on next steps, including whether and when your next scheduled dose should be taken. The patient information leaflet included with your pen also contains guidance on missed and extra doses — check it first, then contact your healthcare team.

The same principle applies if you have accidentally taken a double dose of Wegovy (semaglutide) — both are once-weekly injectables and both require clinical guidance in this situation rather than self-management.

If you experience any severe or persistent symptoms after a double dose — including prolonged vomiting, severe abdominal pain, or anything that feels serious — seek medical attention without delay.

If you are still getting to grips with your injection schedule, it may help to read about what to expect from your first Mounjaro injection or to review the guidance around Mounjaro dose stages and titration, which explains how the weekly schedule is structured.

One of the most practical ways to prevent an accidental double dose is to keep a clear, time-stamped record of every injection you give yourself — and that is exactly what GLP Trackr is built for. The app's dose logging feature lets you record each injection as soon as you give it, noting the date, time, and dose strength, so there is never any uncertainty about whether you have already taken this week's dose.

If a double dose does happen, you can log the incident in GLP Trackr and bring that clear record — including dates, times, and dose strengths — to your prescriber appointment or call. The app's doctor report feature pulls together your dose history in a format that is easy to share, which can help your healthcare professional understand exactly what happened and advise accordingly. GLP Trackr also supports dose reminders, so a gentle weekly prompt means you are far less likely to lose track of your schedule in the first place.

For more on how the dose titration schedule is structured, see the Mounjaro dose guide. You may also find it useful to read about whether doubling a Mounjaro dose is ever appropriate — the short answer is that any such decision belongs with your prescriber.

Always follow the guidance of your prescriber or doctor after any dosing error — they know your full medical history and are the right person to advise you. GLP Trackr records your journey and helps you have informed conversations with your healthcare team; it is not a substitute for their clinical judgement.

Keep your injection history accurate and accessible — download GLP Trackr on the App Store or Google Play and start your free 7-day trial today.