How to Track Your Mounjaro Injections — A Complete UK Guide

Keeping an accurate injection log is one of the most important habits you can build on Mounjaro (tirzepatide). Whether you're prescribed it via the NHS, a private clinic, or a self-pay pharmacy, tracking your doses helps you stay safe, consistent, and in control of your health journey.

Why Tracking Your Injections Matters

Mounjaro is a once-weekly subcutaneous injection. Missing a dose, taking one too early, or losing track of which injection site you last used can affect both your safety and your results. The MHRA-approved prescribing information for Mounjaro emphasises consistent weekly dosing for optimal blood glucose and weight management outcomes.

Tracking your injections allows you to:

• Confirm your next injection date accurately
• Rotate injection sites to prevent lipohypertrophy (fatty lumps under the skin)
• Monitor how long each pen lasts and plan ahead for reorders
• Share a reliable medication history with your GP, pharmacist or specialist
• Spot patterns between dose days and side effect peaks

What Information Should You Record?

For each Mounjaro injection, you should ideally log the following:

• Date and time — so you know exactly when your next dose is due (7 days later)
• Dose strength — Mounjaro comes in 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg, and 15mg pens
• Injection site — abdomen, upper thigh, or upper arm (rotate each week)
• Pen batch/expiry — important for storage safety
• Any immediate reactions — redness, swelling, or discomfort at the site

The Mounjaro Dose Escalation Schedule

Mounjaro follows a structured dose escalation schedule. In the UK, prescribers typically follow the NICE-approved pathway:

• Weeks 1–4: 2.5mg once weekly
• Weeks 5–8: 5mg once weekly
• Dose increases in 2.5mg increments every 4 weeks thereafter
• Maximum dose: 15mg once weekly

Your prescriber may adjust this schedule based on tolerance. Keeping a clear injection log helps your clinical team make informed titration decisions.

What If You Miss a Dose?

If you are unsure what to do after a missed dose, follow the instructions in the medicine leaflet and contact your pharmacist or prescriber for advice.

Pen Stock Management

Mounjaro shortages have been a recurring issue in the UK. Being proactive about pen stock management can prevent gaps in treatment. Your log should track how many pens you have remaining and flag when you need to reorder. Most UK pharmacies and prescribing services recommend ordering a minimum of 2 weeks before your last pen runs out.

Using WeightWise-UK to Track Injections

WeightWise-UK includes a dedicated injection tracker designed specifically for UK GLP-1 patients. It allows you to log every dose, set weekly reminders, rotate injection sites systematically, and monitor your pen stock — all built around the clinical realities of NHS and private Mounjaro prescribing.

You can even share your injection history as a PDF summary with your prescribing team — something that genuinely differentiates this app from generic health trackers.