Does Wegovy Make You Tired?

Many people are seeing impressive results on Wegovy. Not just for losing weight, but improving their overall health.

So, if you’re feeling more tired since starting Wegovy, you might be concerned. Isn’t a healthy lifestyle supposed to give you more energy?

Here, we explain whether tiredness is a side effect of Wegovy and why you might feel tired. And give you advice on what you can do to manage it and when to get help.

Is Feeling Tired on Wegovy Normal?

Yes, it can be. Fatigue is listed among the common side effects on the patient information leaflet. However, this doesn’t mean everyone will feel tired while taking Wegovy (semaglutide).

Some patients will feel more tired in the first few weeks of treatment. For others, they’ll feel more fatigued after their dose increases. In most cases, feeling tired isn’t a sign that something is seriously wrong.

“It’s usually temporary and settles with time,” explains Simple’s Chief Clinical Officer Abdal Alvi. “If you are concerned, make sure to speak with one of our clinical team.”

“It’s important to make sure you are eating enough to maintain energy levels and that treatment isn’t too effective for you.”

What Causes Wegovy Fatigue?

Wegovy works by mimicking a natural hormone called glucagon-like peptide-1 (GLP-1). The GLP-1 hormone is responsible for regulating your appetite. This can change how your body uses energy, which might explain the dip in your usual energy levels.

However, there’s no single cause for tiredness on Wegovy. A few factors can play a role.

Reduced Calorie Intake

Like other GLP-1 weight loss medications, Wegovy suppresses your appetite and helps you stay fuller for longer.

This means you’re likely eating less and taking in fewer calories – and calories are your body’s main energy source. This dip in energy intake can make you feel more tired until your body has fully adapted to these changes.

Blood Sugar Changes

Semaglutide is approved to treat type 2 diabetes as well as for weight management. That’s because it can affect how your body releases insulin and processes sugar.

If your blood sugar levels drop lower than normal, you might feel sluggish, lightheaded, or drained.

Digestive Side Effects

Nausea, vomiting, and diarrhoea are common in the early weeks of treatment. They can lead to dehydration or reduced food intake. Both can contribute to tiredness.

Dose Adjustments

Many people notice an increase in fatigue when they move up a dose. It should settle as your body adapts to the dose.

This is why your healthcare provider will increase your dose gradually – it helps you to build tolerance.

Other Health Factors

The tiredness you feel may not be caused by Wegovy.

Poor sleep, high stress and other medications can also leave you feeling drained. So can underlying medical conditions such as anaemia (low iron levels) or thyroid problems, according to the NHS.

That’s why it’s important to let your healthcare provider know about any persistent fatigue. They can help identify the cause, rule out other health issues, and make sure you’re getting the right treatment or support.

Does Wegovy Fatigue Go Away?

For many people, yes. Fatigue often improves within a few weeks once your body adjusts to the medication and your new eating habits.

If your tiredness is linked to dose increases, it may settle again after a short adjustment period. Some people find the tiredness goes away completely. Others notice they still tire more easily than before but can manage it with lifestyle changes.

However, if your tiredness is severe, persistent, or getting worse, it’s worth speaking to your healthcare provider. There may be another cause, or your dose or treatment plan may need adjusting.

Practical Tips to Manage Wegovy Tiredness

If you’re feeling more tired than usual, there are some simple steps you can take:

• Stay Hydrated: Even mild dehydration can sap your energy. Aim to drink two to three litres of water throughout the day – and more if you’ve had vomiting or diarrhoea.

• Eat a Balanced Diet: Try to include a mix of protein, healthy fats, and slow-release carbohydrates. This keeps your blood sugar steady and avoids energy crashes.

• Don’t Skip Meals: While it’s tempting to eat much less, skipping meals entirely can make fatigue worse. Small, regular portions are usually better for energy levels.

• Adjust Activity Gradually: Exercise can help boost energy in the long term. Light walks, stretching, or low-impact activities may feel better than intense workouts. Listen to your body in the early stages of treatment.

• Get Quality Sleep: Aim for a consistent bedtime routine, a cool dark room, and limited screen time before bed. Good sleep is one of the most effective “energy boosters” you can give yourself.

• Monitor Other Symptoms: Watch for dizziness, fainting, a rapid heartbeat, or severe nausea. Contact your healthcare provider or a GP if you experience these symptoms.

When to Seek Support

Contact your GP, pharmacist, or treatment provider if:

• Your tiredness is stopping you from carrying out daily activities.
• You also have ongoing nausea, vomiting, or diarrhoea that prevents you from eating or drinking enough.
• You experience dizziness, fainting, chest pain, or shortness of breath.
• You suspect another medical condition might be causing your fatigue.

If you bought Wegovy privately, your provider should review your side effects at regular check-ins. At Simple, our clinicians review each patient’s treatment and offer tailored advice.

Key Takeaways

• Fatigue is a Common Side Effect of Wegovy: Official prescribing information lists it as a side effect. While not everyone experiences fatigue, it is normal.
• Causes of Tiredness on Wegovy Vary: The medication slows stomach emptying, which reduces food intake. Blood sugar changes, dehydration and dose adjustments may also play a role.
• The Feeling is Often Temporary: It will likely improve as your body adapts to treatment.
• Simple Lifestyle Steps Can Help: Balanced meals, hydration, and quality sleep can all make a noticeable difference.
• Seek Medical Advice: If tiredness is severe, persistent, or comes with other worrying symptoms.

References

Wegovy 0.25 mg, FlexTouch solution for injection in pre-filled pen – Summary of Product Characteristics (SmPC) – (emc) | 13799. (n.d.). https://www.medicines.org.uk/emc/product/13799/smpc.

NICE. (2023, March 8). Overview | Semaglutide for managing overweight and obesity | Guidance | NICE. https://www.nice.org.uk/guidance/ta875.

Website, N. (2025, May 1). Tiredness and fatigue. nhs.uk. https://www.nhs.uk/symptoms/tiredness-and-fatigue/.

NICE. (2025, January 14). Overview | Overweight and obesity management | Guidance | NICE. https://www.nice.org.uk/guidance/ng246.

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