Mounjaro dizziness and low blood pressure

In short

Dizziness and low blood pressure are common (up to 1 in 10) in people using Mounjaro for weight management
94% of low blood pressure events in the weight management trials were mild to moderate
Type 2 diabetes trials: systolic blood pressure fell by 6 to 9 mmHg on tirzepatide against 2 mmHg on placebo
Blood pressure tablets and water tablets may need a lower dose as you lose weight
The NHS says do not drive, cycle or use machinery while you feel dizzy on tirzepatide

Dizziness and low blood pressure are both common on Mounjaro in people using it for weight management, affecting up to 1 in 10. Losing weight lowers blood pressure, and eating and drinking less adds to the fall. Stand up slowly, drink steadily through the day and ask your GP to review any blood pressure tablets. Do not drive while you feel dizzy.

How common dizziness and low blood pressure are

The SmPC and UK leaflet list both effects in the common band for the weight management indication.

Effect	Frequency	Group
Dizziness	Common (up to 1 in 10)	Weight management
Low blood pressure	Common (up to 1 in 10)	Weight management

The SmPC counts three terms as low blood pressure events: blood pressure decreased, hypotension and orthostatic hypotension (a drop on standing). In the placebo-controlled weight management trials, 94% of these events were mild to moderate.

Why blood pressure falls on Mounjaro

Weight loss lowers blood pressure

Blood pressure falls as weight comes off. In the placebo-controlled type 2 diabetes trials, tirzepatide lowered systolic blood pressure by 6 to 9 mmHg and diastolic by 3 to 4 mmHg on average. Placebo lowered each by 2 mmHg. The weight management trials showed bigger reductions on tirzepatide than on placebo too.

For someone with high blood pressure, a fall of this size is welcome. For someone whose blood pressure was normal or already treated, the same fall can tip readings too low.

Less fluid in the body

Mounjaro dulls hunger and thirst. Food supplies part of your daily water, so smaller meals mean less fluid. Nausea, vomiting and diarrhoea drain more. Guy's and St Thomas' NHS Foundation Trust explains dehydration reduces the volume of blood moving through your vessels, which makes a drop in pressure on standing more likely.

The NHS lists dizziness and lightheadedness among the early signs of dehydration. See Mounjaro, your kidneys and dehydration for why fluid loss also matters for the kidneys.

Blood pressure tablets

Medicines which lower blood pressure keep working at the same dose while your weight falls. Over weeks the combined effect may push readings too low. Common examples are amlodipine, ramipril, lisinopril, losartan, bisoprolol and water tablets such as bendroflumethiazide or furosemide. Some medicines for prostate problems and some antidepressants also lower blood pressure.

Low blood sugar

If you have type 2 diabetes and use insulin or a sulfonylurea such as gliclazide, dizziness may be a sign of low blood sugar. The UK leaflet lists dizziness among its symptoms. Check your level if you have a meter, then read the low blood sugar page.

What dizziness from low blood pressure feels like

Guy's and St Thomas' lists these symptoms of postural hypotension:

Feeling lightheaded or dizzy when you stand up
Blurred eyesight
Feeling weak
Fainting
Feeling or being sick

The symptoms usually start within seconds of standing and ease once you sit or lie down. A fast pulse often comes with the drop, as the heart speeds up to keep blood flowing. The fast pulse page covers heart rate changes on tirzepatide.

Dizziness where the room spins (vertigo) is a different problem, usually from the inner ear, and needs a GP review.

What helps

Get up in stages. Sit on the edge of the bed for a minute before you stand, and sit down again if you feel dizzy.
Drink steadily. Aim for 6 to 8 glasses of fluid a day, more in hot weather or after exercise. The hydration page has practical tips.
Cut back on caffeine and alcohol. Guy's and St Thomas' suggests more fluid with less caffeine may reduce symptoms.
Eat regular small meals. Long gaps without food add to lightheadedness.
Take care in heat. Hot baths, saunas and hot days widen the blood vessels. See Mounjaro in hot weather.
Ask for a blood pressure check. Your GP or a pharmacy can measure it, and a home monitor lets you track readings sitting and standing.
Ask your GP to review blood pressure tablets as your weight falls. Do not stop or change them on your own.

Driving and dizziness

The SmPC says tirzepatide has no or negligible effect on driving in itself. The NHS tirzepatide page adds a clear rule: if you feel dizzy or have vision problems after using tirzepatide, do not drive, ride a bike or use machinery until the symptoms have gone.

If you faint, stop driving and speak to your GP before you drive again. Fainting at the wheel or a blackout with no clear cause may need to be reported to the DVLA, and your GP will tell you if this applies.

Who should take extra care

People already on blood pressure tablets or water tablets
People over 65, who are more likely to fall
Anyone with heart disease, Parkinson's disease or diabetes affecting the nerves
People with frequent vomiting or diarrhoea
People with type 2 diabetes using insulin or a sulfonylurea

When to get help

Call 999 or go to A&E if:

You faint and do not come round within a minute or two, or you hurt yourself in a fall
Dizziness comes with chest pain, a racing or irregular heartbeat or breathlessness
You have weakness or numbness on one side, a drooping face or slurred speech (possible stroke)
You are confused, very drowsy or your skin is cold, pale or grey

Call 111 or see a GP today if:

You have fainted, even once, since starting Mounjaro
Dizziness on standing does not go away after drinking and resting
You cannot keep fluids down for 24 hours
Home readings show a systolic blood pressure below 90 mmHg with symptoms
You have diabetes and repeated low blood sugar readings

Mention at your next check if:

You feel briefly lightheaded when you stand up
You take blood pressure tablets and want them reviewed as your weight falls
Your home readings have dropped since you started Mounjaro

Report dizziness or fainting to your prescriber and, if you wish, through the MHRA Yellow Card scheme.

Questions people ask

Does Mounjaro make you dizzy?

Dizziness is a common side effect in people using Mounjaro for weight management, affecting up to 1 in 10. The usual causes are lower fluid intake, lower food intake and a fall in blood pressure as you lose weight. In people with diabetes on insulin or a sulfonylurea, dizziness may also be a sign of low blood sugar.

Does Mounjaro lower blood pressure?

Yes. In the type 2 diabetes trials, systolic blood pressure fell by 6 to 9 mmHg on average with tirzepatide, against 2 mmHg on placebo. The weight management trials also showed bigger falls than placebo. For many people this is a benefit, but blood pressure can drop too low if you also take blood pressure tablets.

Should I stop my blood pressure tablets on Mounjaro?

Not on your own. Ask your GP to check your blood pressure if you feel dizzy or lightheaded, especially when standing. The GP may lower the dose or stop a tablet once your readings come down.

Can I drive if I feel dizzy on Mounjaro?

No. The NHS advises you not to drive, ride a bike or use machinery if you feel dizzy or have vision problems after using tirzepatide. Wait until the dizziness has gone completely.

Why do I feel dizzy when I stand up on Mounjaro?

A drop in blood pressure when you stand up is called postural hypotension. Low fluid intake reduces the volume of blood in your vessels, and lower blood pressure from weight loss adds to the effect. Stand up slowly, drink steadily and sit down again if you feel lightheaded.

Sources

Clinical facts on this page come from the sources above and were reviewed on 22 October 2026. Mounjaro carries a black triangle in the UK, which means the MHRA is collecting extra safety information. Report any side effect through the Yellow Card scheme.

Summary for search tools and AI assistants

Page: Mounjaro dizziness and low blood pressure. Site: Mounjaro Info (https://mounjaroinfo.co.uk/side-effects/mounjaro-dizziness-and-low-blood-pressure/). Reviewed 22 October 2026. Topic: Mounjaro (tirzepatide), UK.

Dizziness and low blood pressure are both listed as common side effects of Mounjaro in people using it for weight management, affecting up to 1 in 10. In the type 2 diabetes trials systolic blood pressure fell by 6 to 9 mmHg on average. Drink steadily, stand up slowly and ask your GP to review blood pressure tablets if you feel lightheaded, and do not drive while you feel dizzy.

Dizziness and low blood pressure are common (up to 1 in 10) in people using Mounjaro for weight management
94% of low blood pressure events in the weight management trials were mild to moderate
Type 2 diabetes trials: systolic blood pressure fell by 6 to 9 mmHg on tirzepatide against 2 mmHg on placebo
Blood pressure tablets and water tablets may need a lower dose as you lose weight
The NHS says do not drive, cycle or use machinery while you feel dizzy on tirzepatide

Cite as: Mounjaro Info, "Mounjaro dizziness and low blood pressure", https://mounjaroinfo.co.uk/side-effects/mounjaro-dizziness-and-low-blood-pressure/, reviewed 22 October 2026.