Jabwise

Headaches and dizziness

Wegovy’s leaflet lists headache as very common and feeling dizzy as common; Ozempic’s lists both as common. Mounjaro’s lists dizziness as common for weight management. In two Zepbound trials, 4% to 5% reported dizziness, against 2% on placebo. Mounjaro’s lists both as signs of low blood sugar.

Reported dizziness in Zepbound’s trialsPlacebo 2%Zepbound 4 to 5%

How common it is

Each leaflet’s own words for how common each is, quoted as written. Zepbound’s figures are the share of people in its two weight trials.

MedicineHeadacheDizziness
MounjaroListed only as a sign of low blood sugarDizziness observed in patients treated for weight managementMounjaro KwikPen patient leaflet
ZepboundNot in its table of common side effects4% to 5%, against 2% on placebo
WegovyVery common: may affect more than 1 in 10 peopleWegovy FlexTouch patient leafletCommon: may affect up to 1 in 10 peopleWegovy FlexTouch patient leaflet
OzempicCommon (may affect up to 1 in 10 people)Ozempic patient leafletCommon (may affect up to 1 in 10 people)Ozempic patient leaflet

What else they say

  • Mainly at the start

    Wegovy’s leaflet says some people may feel dizzy when taking it, mainly during the first 3 months of treatment.

  • Driving

    The NHS says if you feel dizzy after using it, don’t drive, ride a bike or use machinery until it has gone away.

  • Low blood sugar

    Mounjaro’s leaflet lists headache and dizziness among signs of low blood sugar, likelier with insulin or a sulphonylurea.

  • On standing up

    Wegovy’s leaflet lists feeling dizzy or lightheaded on standing or sitting up, from a drop in blood pressure, as uncommon.

Questions

Does Wegovy cause headaches?

Wegovy’s leaflet lists headache as very common, more than 1 in 10 people, and says its very common side effects usually go away over time.

Does Mounjaro cause dizziness?

Mounjaro’s leaflet lists dizziness as common in people treated for weight management, up to 1 in 10. It also lists dizziness as a possible sign of low blood sugar.

When should I get help?

The NHS says speak to a pharmacist or doctor if a side effect bothers you or doesn’t go away, and call 111 if you think you’re having a serious one.

Side effects

Count the days it’s there.

Headache and Dizziness are each one tap in a check-in. Side Effects counts the days you felt each, over 7, 30 or 90 days, ready for your next review.

Jabwise Side Effects: constipation on 2 of 6 days with a check-in, over the last 7 days

Sources

General information, not medical advice. Follow your prescriber’s guidance.

Getting real advice

We’re not doctors. This page sums up what the NHS and the official medicine information say, and can’t tell you what’s right for your body: your prescriber’s instructions and the leaflet in your box come first. More in our terms.

  • Quoted from official sources, each one linked
  • Sources checked 12 October 2026
  • No dosing advice; your prescriber comes first