The short answer: Yes, for most people Mounjaro (tirzepatide) lowers blood pressure, usually by about 4 to 8 points systolic more than placebo. Most of that drop comes from weight loss, and it tends to be largest in people who start with higher readings. Some people on blood pressure medicines end up needing a lower dose, but only your prescriber should make that change, based on your home and office readings.

How much does Mounjaro lower blood pressure?

The numbers depend on which trial you look at, because the people in each trial were different.

The same Heart analysis found that most of the drop happened in the first 24 weeks, then held steady. By week 72, 58.0% of people on tirzepatide had normal blood pressure, compared with 35.2% on placebo.

Mounjaro is approved for type 2 diabetes, not for high blood pressure. The blood pressure change is a side benefit seen in trials, not a labeled use. The FDA label for Mounjaro does not list blood pressure as an approved effect.

What did 24-hour blood pressure monitoring show?

Office readings can be thrown off by nerves or a single bad measurement. So researchers ran a 24-hour ambulatory monitoring substudy of SURMOUNT-1, published in the AHA journal Hypertension in 2024. People wore a cuff that took readings every 30 minutes by day and every hour at night.

Key results at 36 weeks:

  • 600 people enrolled, and 494 had valid readings at both the start and week 36.
  • Average 24-hour systolic pressure at the start was 124.6 mmHg, so most people were not badly hypertensive.
  • Compared with placebo, 24-hour systolic pressure fell 7.4 mmHg on 5 mg, 10.6 mmHg on 10 mg, and 8.0 mmHg on 15 mg.
  • Diastolic pressure fell 2.0 mmHg on 5 mg and 2.9 mmHg on 10 mg. The 15 mg change (0.5 mmHg) was not significant.
  • Daytime and nighttime readings both came down. Nighttime pressure is a strong predictor of heart risk.

This substudy only enrolled people whose blood pressure was under 140/90 and whose blood pressure medicines had been stable for at least 3 months. The results may not match what happens in people with uncontrolled hypertension.

Is the drop in blood pressure just from weight loss?

Mostly, but not completely. In the Heart analysis of SURMOUNT-1, weight loss explained 68% of the systolic drop and 71% of the diastolic drop. The 24-hour substudy put the share at about 70%.

The SURPASS analysis found the same general pattern in type 2 diabetes. It also found some drop that weight loss did not explain. In SURPASS-4, which enrolled people with heart disease, the part not tied to weight loss explained 33% to 57% of the gap compared with insulin glargine.

For a wider look at how Mounjaro affects heart risk factors, see our guide to Mounjaro and cholesterol and triglycerides. For typical weight loss by dose, see Mounjaro weight loss results.

What happens to heart rate on Mounjaro?

While blood pressure tends to go down, resting heart rate tends to go up a little. The Mounjaro prescribing information reports a mean rise of 2 to 4 beats per minute, compared with 1 beat per minute on placebo.

The label also reports episodes of fast heart rate (a rise of 15 beats per minute or more) in 4.3% on placebo, 4.6% on 5 mg, 5.9% on 10 mg, and 10% on 15 mg. The FDA calls the clinical relevance of this rise "uncertain."

The 24-hour substudy saw a similar pattern. Heart rate rose 2.1, 2.3, and 5.4 beats per minute more than placebo on 5 mg, 10 mg, and 15 mg. Tell your prescriber if you notice a racing heart at rest.

Can blood pressure drop too low on Mounjaro?

It can, but it was uncommon in trials. In the Heart analysis of SURMOUNT-1, 6.8% of people on tirzepatide had a blood pressure related side effect, compared with 3.3% on placebo. Dizziness was the most common (4.6% vs 2.3%). Low blood pressure was reported in 1.0% on tirzepatide and 0% on placebo.

The SURPASS analysis found that people starting above 140 mmHg had the biggest drops. People in the lowest quarter of starting pressure (under 122 mmHg) saw no further drop. That pattern lowers, but does not remove, the risk of going too low.

Dehydration is the bigger worry. The FDA label warns of acute kidney injury, sometimes needing dialysis, mostly in people who lost fluid through nausea, vomiting, or diarrhea. Fluid loss also lowers blood pressure, and diuretics add to the effect. Our side effects management guide covers ways to stay hydrated.

MedlinePlus defines low blood pressure as a reading of 90/60 or lower. It says low pressure is a problem mainly when it causes dizziness or fainting.

Will my blood pressure medicines need to change?

Maybe. Many people keep the same medicines, and some need less over time. There is no fixed rule, so the decision belongs to your prescriber.

In the trials, prescribers adjusted blood pressure medicines as they judged best. In SURMOUNT-1, people stayed on their usual medicines, and investigators could change them during the trial. The FDA label notes that in the SURPASS-CVOT heart outcomes trial, investigators were told to adjust heart medicines to meet local blood pressure targets.

The SURPASS analysis found that tirzepatide lowered systolic pressure about the same whether or not people were already taking blood pressure medicine. So if you take one, the two effects can add up.

Steps worth discussing with your prescriber:

  1. Check your blood pressure at home a few times a week, especially during dose increases.
  2. Keep a written log with the date, time, and reading.
  3. Report dizziness, lightheadedness when standing, or fainting right away.
  4. Ask what to do with a diuretic (water pill) on days you cannot keep fluids down.
  5. Do not stop or cut a blood pressure medicine on your own.

For broader guidance on managing high blood pressure, see hypertension.md.

The bottom line

Mounjaro lowers blood pressure in most people, by about 7 mmHg systolic in the largest obesity trial and up to about 11 mmHg in 24-hour monitoring. Most of the effect comes from weight loss. Heart rate rises a few beats. Low blood pressure is uncommon but more likely if you get dehydrated or already take blood pressure medicines. Track your readings and let your prescriber decide on any change.

Last updated: September 2026. This article is for informational purposes only and does not constitute medical advice. Talk to your prescriber before changing any blood pressure medicine or your Mounjaro dose.