Does Wegovy Cause Headaches?
Yes, headaches are a reported side effect of Wegovy (semaglutide), occurring in clinical trials at rates up to 14% among users, compared to 10% on placebo. They typically appear early in treatment and may decrease over time.[1][2]
How Common Are Headaches on Wegovy?
In the STEP trials supporting FDA approval:
- 9-14% of Wegovy patients reported headaches, versus 6-10% on placebo.
- Frequency was dose-dependent, higher at 2.4 mg weekly doses.
Most cases were mild to moderate and resolved without stopping treatment.[2][3]
Why Do Headaches Happen with Wegovy?
Semaglutide mimics GLP-1, slowing gastric emptying and affecting blood sugar and blood pressure. Headaches may stem from:
- Dehydration from nausea/vomiting (common initial side effects).
- Blood sugar fluctuations or vascular changes.
- Rapid weight loss altering electrolyte balance.
Not all users experience this; risk factors include starting at full dose without titration.[2][4]
How Long Do Wegovy Headaches Last?
Headaches often start within the first 4 weeks as the body adjusts to weekly injections. They usually subside after 1-2 months, but persistent cases may signal dehydration or low blood sugar—hydrate and monitor glucose.[1][3]
What Should You Do If Wegovy Gives You Headaches?
- Drink plenty of water and eat small, frequent meals to counter GI effects.
- Take over-the-counter pain relievers like acetaminophen if approved by your doctor.
- Contact a provider if headaches are severe, accompanied by vision changes, or last >1 week—dose adjustment or pause may be needed.
- Avoid NSAIDs if you have GI risks, as Wegovy increases stomach issues.[1][4]
Are Wegovy Headaches Different from Ozempic or Mounjaro?
Wegovy and Ozempic (same drug, higher dose for weight loss) share identical headache rates (~10-14%). Mounjaro (tirzepatide, dual GLP-1/GIP) reports slightly lower at 7-12%, possibly due to less nausea.[2][5]
Sources
[1]: Wegovy Prescribing Information (FDA)
[2]: NEJM STEP 1 Trial
[3]: Novo Nordisk Wegovy Safety Data
[4]: Drugs.com Wegovy Side Effects
[5]: Mounjaro Prescribing Information (FDA)