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Anyone getting dizziness or “brain zaps” on mounjaro?

15 replies

purpledaze24 · 05/07/2025 11:24

I’m at the end of the third week of 2.5mg MJ. I’ve been feeling lightheaded on and off for the past week but this morning I’ve woken up and I feel absolutely awful. Dizzy, and everytime I turn my head I get what I’d describe as a brain zap (I’ve had them before when coming off antidepressants) it’s like a kind of zap feeling in my brain and makes me feel very dizzy for a second. I have also come on my period today so there’s a small chance it could be that instead but I doubt it. I’ve never had anything like this without it being related to medication before. Anyone experienced similar?

OP posts:
Doggymummar · 05/07/2025 11:26

I get light headed if I'm dehydrated or not eaten enough

SecretSquirrel703 · 05/07/2025 12:08

Could be dehydrated &/or need electrolytes

Anyone getting dizziness or “brain zaps” on mounjaro?
KillingMeWithSilence · 05/07/2025 12:27

I have been on it a while. Started getting dizzy a while ago. Dr said it is BPPV, didnt equate it to the jab. Might do a bit of research as the dizziness is still there

10storeylovesong · 05/07/2025 14:46

This reply has been withdrawn

Withdrawn at poster's request

TheNinthLock · 05/07/2025 14:56

I had this in my third week of 2.5. But only twice, in that third week.
Now in week 12 (and on 5mg) and have not had them again.

perimenopoppet · 05/07/2025 16:10

Dizziness yes but no brain zaps. Orthostatic (Postural) hypotension is a known side effect - I had this for a few weeks a couple of days after the jab with my second pen. I got dizzy when I stood up from lying or crouching down and my vision went for a second. It’s not happened for a while though.

Koinophobia · 05/07/2025 16:27

I had dreadful brain zaps during perimenopause. In fact reading this has reminded me I haven't had one for a couple of years.

Histoscientist · 05/07/2025 19:06

Mounjaro lowers blood pressure and blood sugar so it could be either of them. Make sure you drink often and eat little and often regularly throughout the day. It does wear off after your first few weeks/month. Having more protein helped me out with it.

Faintonmounj · 24/02/2026 02:15

I have just finished my second week and had two fairly significant faint feelings when driving which really scared me, am concerned about taking the next dose as i drive alot

runadun · 24/02/2026 07:29

What have you been eating? Both dizziness and brain zaps are likely due to extreme change in diet rather than the medication itself.

SexyFrenchDepression · 24/02/2026 07:42

I was like that during my periods for the first 2 times. Only other times was if I hadnt eaten enough.

StrongLikeMamma · 24/02/2026 08:04

I get dizzy at the gym - need to make sure I eat and hydrate well beforehand.

HappyWineDay · 24/02/2026 09:14

Faintonmounj · 24/02/2026 02:15

I have just finished my second week and had two fairly significant faint feelings when driving which really scared me, am concerned about taking the next dose as i drive alot

Are you sure you’re eating enough and getting enough fluids? You do need to be careful as these WLIs can make it easy to eat and drink too little, which may be what is happening to you.

Woo383040 · 24/02/2026 10:47

I had dizziness along with lightheadedness when I first started. No brains zaps though. My suppression was extreme and after trying 2.5mg, I decided to halve my dose. That made a massive difference to me. I had a gap before I tried the half dose. Everybody seems to react differently. If I couldn’t have lowered the dose, I would’ve stopped. It would have been too horrible to continue.

Faintonmounj · 25/02/2026 02:01

I agree, I haven't taken the third dose as I just feel crap all the time

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