Switching from 7.5mg Mounjaro to Wegovy: What the Transition Involves

Mounjaro and Wegovy are both once-weekly injectable medicines, but they are not interchangeable on a milligram-for-milligram basis. Understanding why matters if you are considering a switch.

Different active substances, different mechanisms

Mounjaro contains tirzepatide, which acts on both GLP-1 and GIP receptors. Wegovy contains semaglutide, which acts on GLP-1 receptors alone. Because the underlying mechanisms differ, the dose strengths cannot be mapped directly onto one another — 7.5 mg of tirzepatide does not correspond to a specific semaglutide dose in any straightforward way. Similarly, moving from the 5 mg Mounjaro stage to Wegovy involves the same principle: your prescriber determines the appropriate starting point based on your response and history, not a simple conversion formula.

What a switch actually involves

When moving between these medicines, a prescriber will typically consider factors such as how long you have been on your current dose, how your body has responded, and whether any side effects are relevant. According to guidance aligned with the Mounjaro to Wegovy dose considerations, there is no universally agreed conversion chart — clinical judgement is central. You can read more about the general titration approach on the Mounjaro dosing overview.

What the dose stages look like

For context, Mounjaro is commonly prescribed at increasing strengths — 2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg — with each step led by the prescriber. Wegovy follows a separate schedule, typically starting at 0.25 mg and escalating up to 2.4 mg. These figures are factual reference points; your own schedule is set by your prescriber and should not be adjusted without their guidance.

If you have questions about accessing your current prescription, that is best directed to your prescriber or a registered pharmacy in your country.

Whenever your treatment changes — whether that is a dose adjustment or a switch to a different medicine — having a clear, timestamped log of your journey becomes especially useful. GLP Trackr's dose logging feature lets you record each injection with its date, dose strength, and medicine name, so the transition from one treatment to another is captured accurately rather than relying on memory.

Alongside dose logging, the side-effect tracker lets you note how you feel in the days after each injection. Patterns that emerge — such as nausea timing or changes in energy — are exactly the kind of information that helps a conversation with your prescriber go further. You can generate a summary of your logged data to bring to appointments, giving your healthcare professional a fuller picture than recall alone can provide.

If you have been tracking consistently on Mounjaro, that history does not disappear when you switch — it stays in your log as a baseline to compare against as you settle into a new medicine.

Safety note: Any decision about switching medicines, adjusting your dose, or timing a transition must be made with your prescriber — never on your own. If you experience symptoms that feel severe or unexpected during or after a switch, contact your healthcare professional promptly. GLP Trackr helps you record what is happening so you can discuss it clearly; it is not a substitute for clinical advice.

Keep a detailed record of your transition and take that data to your next appointment — download GLP Trackr on the App Store or Google Play and start your free 7-day trial today.