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Does Semaglutide Make You Tired?

Dorianne Green
Author:
Dorianne Green
Medical Writer
Dr. William Grigg
Medical Reviewer:
Dr. William Grigg
DO
The medications listed on this website are provided for informational purposes only.
Their inclusion does not guarantee they will be prescribed to any individual, as treatment decisions are ultimately at the discretion of healthcare providers. Healthcare providers may prescribe other medications or recommend non-pharmacological treatment based on the patient’s unique health circumstances and needs. Read more

Semaglutide has a boxed warning[1] , the most serious type of warning from the Food and Drug Administration (FDA). Semaglutide is contraindicated in patients with personal or family history of thyroid C-cell tumors, including medullary thyroid carcinoma (MTC) or in patients with MEN 2. Remember to discuss the risks with your healthcare provider.

Highlights

  • Fatigue is a side effect of semaglutide (Wegovy) affecting 1 in 10 patients.
  • Semaglutide-related fatigue varies across individuals and may present as exhaustion, tiredness, physical weakness, lethargy, low energy, sleepiness, or mood swings.
  • Tiredness may occur when starting semaglutide treatment and during upward dose adjustments.

Semaglutide (Wegovy) is approved as a weight-loss medication and an obesity treatment under certain brand names, and is also used to manage blood glucose levels in patients with diabetes. It works by mimicking the action of the natural hormone glucagon-like peptide-1[2] (GLP-1), which plays a vital role in how the body responds to food and stores energy. 

Like all medications, semaglutide has side effects, and this article will discuss the possibility of fatigue as one of those. Let’s explore why and when it might occur, what helps, and when to seek help.

Get ongoing support and consult on any side effects throughout your weight loss journey online.

Does Semaglutide Make You Tired?

Semaglutide can cause fatigue; it’s a common side effect affecting between 6[3] and 11[4] out of every 100 people. Some individuals report extreme fatigue, whereas others report only low energy with semaglutide. Others are not affected at all.

Everyone might describe semaglutide drowsiness differently:

  • Physically, I’m exhausted.
  • I have no energy and don’t do much during the day.
  • I’ve become so lazy that I have problems starting things.
  • I’ve lost interest in doing the things I used to enjoy.
  • It just makes me feel terrible, especially when the dose increases again.
  • I’m not concentrating or thinking clearly.
  • I’m feeling weak and tired all the time; it’s not just my body, but my mind as well.
  • I have horrible mood swings; I can’t handle everyone’s nonsense.

Next, let’s look at why this is happening.

Why Am I So Tired on Semaglutide? Common Causes

There are several reasons you might be feeling tired on semaglutide. Some feel fatigued because of the medication’s weight-management effects, while in others, common side effects of semaglutide can exacerbate tiredness.

"Fatigue is one of the more common side effects patients may notice when starting semaglutide or increasing the dose. In many cases, it’s related to reduced calorie intake, changes in blood sugar regulation, or the body adjusting to the medication. The good news is that for most people, this tiredness is temporary and tends to improve as the body adapts."
William S. Grigg DO
Medical provider at MEDvidi

Reduced Caloric Intake

Semaglutide[5] helps you lose weight by:

  • Suppressing appetite
  • Making you feel full faster
  • Reducing your cravings for the unhealthy foods

So you’re taking in fewer calories and therefore have less energy than you used to, which can make you feel weak or exhausted.

Blood Sugar Changes

Your body processes food differently with semaglutide, resulting in stricter blood sugar control. When you eat, semaglutide stimulates insulin production, which may cause low blood sugar (glucose) levels, especially in people with diabetes. Glucose is the ‘fuel’ that your brain and muscles use, so if there isn’t enough of it, they under-perform and tire easily.

Dehydration

Approximately 1 in 3 people[4] experience nausea, vomiting, or diarrhea when taking semaglutide. Not only does this reduce energy intake and lower blood glucose levels, but it also causes dehydration, which is another contributor to semaglutide exhaustion.

Sleep Disruptions

Common semaglutide treatment side effects, such as nausea, diarrhea, constipation, headache, heartburn, bloating, and abdominal pain, are uncomfortable. This can disrupt sleep and reduce its quality, and a lack of quality sleep can make you tired.

Nutrient Deficiencies

If your appetite is severely affected or if you’re vomiting and not keeping food down for an extended time, you’re at risk of nutrient deficiencies[6] . You might lack protein and essential nutrients, like vitamin B12, potassium, and iron, that your body needs to function normally. In the case of such deficiencies, you may feel more tired.

Fatigue is a semaglutide side effect, but other side effects may worsen tiredness:

  • Nausea and vomiting
  • Diarrhea
  • Constipation
  • Headache
  • Bloating
  • Stomach pain
  • Heartburn

This may sound scary, but the side effects don’t last forever.

"When patients report feeling unusually tired on semaglutide, I encourage them to focus on hydration, balanced nutrition, and consistent sleep habits. Because appetite often decreases on this medication, it’s important to make every meal count nutritionally, so the body still gets the fuel it needs. If fatigue persists beyond a few weeks or interferes with daily life, it’s always worth discussing it with a healthcare provider."
William S. Grigg DO
Medical provider at MEDvidi

How Long Does Semaglutide Fatigue Last?

To minimize drowsiness and other common side effects, your healthcare provider will start you at a very low semaglutide dose and increase it slowly. Even so, with each increase in dose, fatigue may be worse for the first few weeks, then begins to ease as the body adjusts.

The expected adjustment period is approximately 2 to 4 weeks, although response is individualized. That is why you need to be on a dose for at least four weeks before the next increase. If the semaglutide-related fatigue lasts longer than expected, there are options to stay on the dose for longer or drop to a lower dose.

Most side effects are usually temporary[7] and settle after a few weeks on your maintenance dose.

Get an individualized weight loss plan online from a licensed healthcare provider.

How to Deal With Semaglutide Fatigue

  • Stick to Your Prescription. The ‘start low and go slow’ dosage changes are frustrating, but will reduce the risk of semaglutide fatigue. Don’t be tempted to self-adjust.
  • Eat a Balanced Diet. Because you’re eating less on semaglutide, you need to make sure your diet is providing sustained energy. Consult a nutritionist for advice on a healthy, balanced diet containing lean proteins, nutrient-dense meals, and foods with low glycemic index.
  • Have Light Physical Activity. Exercise burns energy; while you’re tapering up your semaglutide (Wegovy), walk and perform gentle resistance exercises instead of heavy cardiovascular training.
  • Learn the Sleep Basics. Although semaglutide can make you sleepy, avoid daytime naps, as this will further disrupt natural sleep patterns, causing a vicious cycle. Prioritize sleep hygiene practices such as ensuring a dark, cool bedroom, going to bed at the same time, and avoiding screens before bedtime.
  • Manage GI Side Effects. Almost every second person feels nauseous when taking semaglutide, so here are tips to try:
    • Eat smaller portions[8] more frequently
    • Eat bland, low-fat foods like crackers, toasts, and rice
    • Avoid spicy food and alcohol
    • Eat slowly[9]
    • Stop eating when you’re full
    • Don’t lie down after eating
  • Stay Hydrated. Avoid dehydration by drinking an average of 8 glasses of water per day. You might need more or less fluids, and an easy way to monitor your hydration is to check if your urine is clear and has a light yellow color. If you’re vomiting or experiencing diarrhea, ask your doctor if rehydration solutions containing electrolytes are appropriate.

If none of these strategies is helping with the exhaustion, it’s time to get medical advice.

When to Seek Medical Advice

Call your healthcare provider soon if fatigue persists beyond four weeks or interferes with your daily life; they may consider running additional blood tests to rule out other causes of tiredness. Fatigue can happen because of many reasons, from nutrient deficiencies and insufficient sleep to serious conditions like anemia and thyroid issues. Only after a detailed evaluation a provider will identify an underlying cause.

Seek urgent same-day care if you’re tired and:

  • You’ve fainted, collapsed, or are confused
  • You’re not able to get out of bed
  • Vomiting lasts longer than 24 hours
  • Diarrhea lasts longer than 48 hours
  • Stomach pain is severe, or you also feel it in your shoulder blade or back
  • Feeling unusually tearful, worried, or having mood swings
  • Having the urge of harming yourself

Conclusion

Semaglutide is an effective weight-management medication but it commonly causes fatigue when you start taking it and when the dose increases. Importantly, semaglutide fatigue doesn’t affect everyone, and usually it is temporary and manageable, settling soon after you’ve reached a maintenance dose.

For this reason, it’s important to start your weight loss journey with qualified healthcare professionals. The MEDvidi team provides online personalized weight loss plans and ongoing support, so schedule your virtual consultation today to get support.

Frequently Asked Questions

Typically, semaglutide causes fatigue as a common side effect and is unlikely to give you energy in the first months of treatment.

Yes, it can make you sleepy, drowsy or tired; fatigue is a common side effect when you start the medication and every time after the dose increases. It does settle after reaching the maintenance dose.

Yes, it can be normal to feel exhausted on semaglutide, especially in the first couple of weeks of starting it or after a dose increase. However, fatigue usually goes away over time; consult with your clinician if you feel severely exhausted or if this feeling doesn’t fade over time.

Yes, fatigue from semaglutide goes away over time, usually settling completely after taking the maintenance dose for a few weeks.
If you’re tired and need more energy while on semaglutide, make sure you eat a balanced diet, stay hydrated, prioritize light exercise, and get enough sleep. If these lifestyle changes don’t help, get personalized recommendations from your clinician.
Generally, tiredness is reported as worse (11%) in Wegovy package information because it is registered for weight loss at higher doses; Ozempic label mentions the prevalence of this side effects at 0.4%, and there is no fatigue listed in the Rybelsus label.
No, don’t stop semaglutide if you feel exhausted; it is a common side effect and usually temporary. Instead, contact your healthcare provider for advice.

Sources

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9 sources
  1. DailyMed - WEGOVY- semaglutide injection, solution.
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  2. Collins L, Costello RA. Glucagon-Like Peptide-1 Receptor Agonists. [Updated 2024 Feb 29]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-.
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  3. Ghusn W, De la Rosa A, Sacoto D, et al. Weight Loss Outcomes Associated With Semaglutide Treatment for Patients With Overweight or Obesity. JAMA Network Open. 2022;5(9):e2231982.
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  4. HIGHLIGHTS of PRESCRIBING INFORMATION.
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  5. Kommu S, Whitfield P. Semaglutide. PubMed. Published February 11, 2024.
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  6. Kiani AK, Dhuli K, Donato K, et al. Main nutritional deficiencies. Journal of Preventive Medicine and Hygiene. 2022;63(2 Suppl 3):E93-E101.
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  7. Fornes A, Huff J, Pritchard RI, Godfrey M. Once-Weekly Semaglutide for Weight Management: A Clinical Review. J Pharm Technol. 2022 Aug;38(4):239-246. doi: 10.1177/87551225221092681. Epub 2022 May 13. PMID: 35832567; PMCID: PMC9272494.
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  8. Das SR, Everett BM, Birtcher KK, Brown JM, Januzzi JL Jr, Kalyani RR, Kosiborod M, Magwire M, Morris PB, Neumiller JJ, Sperling LS. 2020 Expert Consensus Decision Pathway on Novel Therapies for Cardiovascular Risk Reduction in Patients With Type 2 Diabetes: A Report of the American College of Cardiology Solution Set Oversight Committee. J Am Coll Cardiol. 2020 Sep 1;76(9):1117-1145. doi: 10.1016/j.jacc.2020.05.037. Epub 2020 Aug 5. PMID: 32771263; PMCID: PMC7545583.
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  9. Davies MJ, Aroda VR, Collins BS, Gabbay RA, Green J, Maruthur NM, Rosas SE, Del Prato S, Mathieu C, Mingrone G, Rossing P, Tankova T, Tsapas A, Buse JB. Management of Hyperglycemia in Type 2 Diabetes, 2022. A Consensus Report by the American Diabetes Association (ADA) and the European Association for the Study of Diabetes (EASD). Diabetes Care. 2022 Nov 1;45(11):2753-2786. doi: 10.2337/dci22-0034. PMID: 36148880; PMCID: PMC10008140.
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Dorianne Green
Author:
Dorianne Green
Medical Writer
Dr. William Grigg
Medical Reviewer:
Dr. William Grigg
DO
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