Understanding GLP-1 Side Effects

Starting a medication such as Wegovy® (semaglutide) or Mounjaro® (tirzepatide) is an important step in your health journey.

These medications are designed to help regulate appetite, improve metabolic health, and support sustainable weight loss. Like all effective treatments, they can cause side effects — particularly during the early stages of treatment or when increasing your dose.

The good news is that most side effects are mild, temporary, and improve as your body adjusts.

At Medara, you're supported by a network of doctors and healthcare professionals throughout your treatment journey. Through regular clinical check-ins, ongoing monitoring, and access to medical support when needed, we're here to help you navigate treatment safely and confidently.

Why Do Side Effects Happen?

GLP-1 medications work by helping you feel fuller for longer, reducing hunger signals, and slowing the rate at which food leaves your stomach.

These effects are a key reason why medications such as Wegovy and Mounjaro can be so effective for weight management.

Because they change how your digestive system processes food, some gastrointestinal symptoms can occur, especially when starting treatment or increasing your dose.

For most patients, these symptoms improve over time.

Common Side Effects

Nausea

Nausea is the most commonly reported side effect when starting GLP-1 treatment.

You may notice:

·       Feeling full quickly

·       Mild stomach discomfort

·       Reduced appetite

·       Occasional queasiness

Many patients find that symptoms settle within the first few weeks.

Constipation

Some patients experience slower bowel movements while on treatment.

Helpful strategies include:

·       Drinking more water

·       Increasing fibre intake gradually

·       Staying physically active

·       Prioritising fruits, vegetables, legumes, and whole grains

Diarrhoea

Changes in bowel habits can occur, particularly after dose increases.

If this happens:

·       Stay well hydrated

·       Eat smaller, lighter meals

·       Avoid very rich, greasy, or spicy foods if they worsen symptoms

Reflux, Bloating and Indigestion

You may occasionally experience:

·       Heartburn

·       Burping

·       Bloating

·       A sensation of fullness after eating

These symptoms can often improve by eating smaller portions and avoiding large meals late at night.

Vomiting

Some patients may experience occasional vomiting, particularly during dose escalation.

If symptoms occur:

·       Take small sips of fluids regularly

·       Focus on hydration

·       Resume eating gradually once symptoms improve

Simple Ways to Improve Tolerance

Small adjustments can make a significant difference.

We generally recommend:

·       Eating slowly and stopping when comfortably full

·       Choosing smaller meals rather than large portions

·       Prioritising protein-rich foods such as eggs, fish, chicken, paneer, tofu, dal, sprouts, and Greek-style yoghurt

·       Drinking water consistently throughout the day

·       Limiting fried foods, heavy meals, and excessive alcohol

·       Continuing regular movement and physical activity where possible

Many patients find that symptoms improve substantially once they learn how their body responds to treatment.

Mounjaro vs Wegovy Side Effects

Mounjaro and Wegovy have very similar side effect profiles. Because Mounjaro works through two hormonal pathways (GIP and GLP-1), some patients may experience slightly more gastrointestinal symptoms during dose increases. However, many patients tolerate both medications very well.

Experiencing side effects does not necessarily mean the medication is unsuitable for you. In most cases, symptoms can be managed through dose adjustment, dietary changes, hydration, and clinical support.

Less Common but Important Side Effects

Serious complications are uncommon, but it is important to be aware of them.

These may include:

·       Gallbladder problems, including gallstones

·       Pancreatitis (inflammation of the pancreas)

·       Significant dehydration from prolonged vomiting or diarrhoea

·       Allergic reactions

Before starting treatment, your medical assessment helps identify factors that may increase your risk. Ongoing follow-up and clinical monitoring also help us identify concerns early and provide guidance when needed. Most patients will never experience these complications, but early recognition is important.

When to Contact the Medara Clinical Team

Please reach out through your Medara dashboard if you experience:

·       Persistent nausea that is affecting your ability to eat or drink

·       Repeated vomiting

·       Ongoing diarrhoea or constipation that is not improving

·       Symptoms of dehydration, including dizziness or reduced urination

·       Significant abdominal pain

·       New symptoms after a dose increase

·       Difficulty using your medication

·       Any side effect that is concerning or affecting your quality of life

You do not need to wait until symptoms become severe. Our clinical team can help assess your symptoms, provide practical recommendations, arrange medical review where required, and determine whether any changes to your treatment plan are needed.

You're Not Expected to Manage This Alone

Weight management is a long-term health journey, and support matters. One of the most important reasons Medara combines treatment with ongoing clinical follow-up is to help patients navigate challenges early, optimise results, and build sustainable habits over time.

Medication is only one part of the journey. Regular check-ins, personalised guidance, access to clinicians, and evidence-based care are all designed to help you feel supported every step of the way.

Key Takeaways

·       Mild digestive symptoms are common when starting Wegovy or Mounjaro.

·       Nausea, constipation, diarrhoea, bloating, and reflux are the most frequently reported side effects.

·       Most symptoms improve as your body adapts to treatment.

·       Eating smaller meals, prioritising protein, and staying hydrated can help reduce side effects.

·       Serious complications are uncommon but should be assessed promptly.

·       The Medara clinical team is available throughout your journey to answer questions, review symptoms, and provide medical support when needed. If you're ever unsure whether a symptom is normal, contact the Medara team through your dashboard. We're here to help.