Is It Safe to Use GLP-1 for Weight Loss?

GLP-1 receptor agonists work by acting on appetite-regulating pathways in the body, increasing feelings of fullness and reducing appetite. Tirzepatide (Mounjaro) also acts on GIP receptors, making it a dual receptor agonist. Both types are taken as once-weekly injections and are typically started at a low dose, with any adjustment made by a prescriber over time.

Commonly reported side effects

The most frequently reported side effects are gastrointestinal — nausea, vomiting, diarrhoea, constipation, and indigestion are all commonly noted, particularly in the early weeks of treatment or after a dose change. Other commonly reported effects include fatigue, headache, dizziness, burping, and injection-site reactions. For many people, these settle as the body adjusts, though experiences vary significantly from person to person.

Who these medicines are not suitable for

These are not medicines suitable for everyone. Suitability depends on individual health history, other conditions, and any other medicines being taken. People with a personal or family history of certain thyroid conditions, a history of pancreatitis, or those who are pregnant, trying to conceive, or breastfeeding should discuss this carefully with their prescriber before use. This is not an exhaustive list — your prescriber is best placed to assess your full picture.

When to contact a healthcare professional promptly

If you experience severe or persistent abdominal pain, significant vomiting, signs of an allergic reaction, or any symptom that feels serious or unusual, contact your healthcare professional promptly. Bothersome side effects should always be reported — many countries have national reporting schemes for this (such as the UK's Yellow Card scheme) and your prescriber can guide you on local options.

For a broader look at how GLP-1 medicines are used for weight loss, including what to expect on your journey, that page covers the wider context. You may also find it helpful to read about tracking your weight-loss progress as part of staying informed and in control.

One of the most practical things you can do while on a GLP-1 medicine is keep a consistent record of how you feel — and that is exactly what GLP Trackr is built for.

The side-effect tracker lets you log symptoms like nausea, fatigue, or digestive changes each day, so you can see patterns over time rather than relying on memory. When you have a prescriber appointment, you can arrive with a clear, structured picture of what you have experienced — and when. This makes those conversations more useful for both of you.

Alongside side-effect logging, the daily check-in captures mood, energy, sleep, and food noise in about 30 seconds each morning. Over weeks, these data points build into a personal insight you simply cannot get from weighing yourself alone. The weight and body tracking features add a visual layer — charts and weekly progress summaries that show your journey honestly, without overpromising what the scale will do on any given day.

GLP Trackr helps you record what is happening so you can discuss it with your prescriber — it is not a substitute for their advice, and any concerns about your safety or suitability should always go to a qualified healthcare professional first.

If you are comparing options or want to understand what makes different GLP-1 medicines distinct, the page on choosing a GLP-1 for weight loss covers the factual differences — always with the reminder that the right choice is your prescriber's to make with you. For a different angle on supporting your journey, some people also explore hypnotherapy alongside weight-loss programmes as a complementary approach.

Start logging how you feel from day one — GLP Trackr is available free on the App Store and Google Play, with a 7-day trial so you can see whether it fits your journey before committing.