What does Wegovy do to blood pressure?

Does losing weight on Wegovy bring blood pressure down?

The short answer is yes, for most people, and weight loss is the primary driver. When body weight falls, cardiac output drops, arterial stiffness tends to ease, and the kidneys excrete sodium more efficiently, all of which contribute to lower blood pressure. In the STEP 1 trial, published in the New England Journal of Medicine, participants taking semaglutide 2.4 mg lost around 15% of body weight over 68 weeks, and systolic blood pressure fell by roughly 5–6 mmHg compared with placebo. Diastolic pressure fell by a smaller margin.

There is also some evidence of a modest direct effect on blood pressure beyond weight loss alone, possibly related to GLP-1 receptor activity on the kidneys and sympathetic nervous system, though the clinical significance of this pathway in humans is still being studied. Practically speaking, the weight-loss effect dominates for most people. You can read more about whether Wegovy helps blood pressure in detail, including who saw the greatest reductions in trials.

It is important to hold the trial averages lightly. A 5–6 mmHg reduction is meaningful at population scale but some people see more, some see less, and a handful see no change. Hypertension is one of the weight-related conditions that can meet the private licence eligibility threshold (BMI 27 or above with a qualifying comorbidity), so it often features in consultations.

If my blood pressure is already controlled by medication, does Wegovy change anything?

Potentially, yes, and this is one of the more practical points for anyone already on antihypertensives. As blood pressure falls during treatment, a dose of amlodipine or ramipril that was well-calibrated before may start to do too much. Symptoms like lightheadedness on standing, tiredness, or feeling faint could be a sign your antihypertensive dose needs reviewing rather than a side effect of Wegovy itself.

NHS England's guidance on weight-management injections specifically flags this point: patients on blood pressure medicines should have their readings monitored and their prescriptions reviewed as weight changes. That review sits with your GP or the clinician managing your hypertension, not something to adjust without guidance. At nume, sorry. At nume, our prescribers ask about existing blood pressure medication at consultation and flag this for ongoing monitoring. Worth raising with your GP proactively once treatment is underway.

For a closer look at how readings tend to shift during treatment, the Wegovy effect on blood pressure page covers the week-by-week picture.

Can Wegovy cause blood pressure to drop too low?

Low blood pressure is not a common effect, but it can happen in specific circumstances. The most likely scenario is not a pharmacological one: significant nausea, vomiting, or reduced appetite can lead to dehydration, which drops blood pressure transiently. This tends to be most relevant in the first few weeks of treatment or after a dose step-up, when GI side effects are most prominent.

People who are already on the lower end of normal blood pressure, or who have a history of postural hypotension (pressure dropping when standing), should mention this during their consultation. A small number of people experience dizziness or lightheadedness that traces back to fluid intake rather than the medicine itself, drinking enough water, especially during warm weather or exercise, matters more than many people expect. If dizziness is persistent rather than occasional, that warrants a call to your prescriber or GP.

The relationship between semaglutide and low blood pressure has its own dedicated page for anyone who wants the fuller picture, and the guide to avoiding low blood sugar on Wegovy covers overlapping symptoms that are sometimes confused with a blood pressure dip.

What should I actually monitor, and how often?

If you have diagnosed hypertension or are on blood pressure medication, checking your readings every two to four weeks during the first few months of Wegovy treatment is sensible, your GP surgery or a home blood pressure cuff works equally well. Take the reading at the same time each day (morning, before food, after a few minutes sitting quietly, the same logic as keeping your weekly injection on the same day each week, tucked in the fridge door as a reminder). Log the numbers so your GP has a clear trend rather than a single data point.

If you do not have diagnosed hypertension and your starting blood pressure is normal, routine daily monitoring is not necessary. That said, if you develop persistent headaches, visual disturbance, or chest tightness at any point during treatment, seek medical attention promptly, do not wait for your next scheduled review.

Anyone thinking about starting semaglutide for weight management can get a thorough picture of the medicine on the semaglutide overview page, or explore treatment options more broadly on the weight-loss treatments page. If you have specific questions about blood pressure and high readings, the Wegovy and high blood pressure page addresses that context directly.