Wegovy, libido and sexual health: what patients are asking

Step 1: Check what Wegovy's prescribing information actually says about libido

The first practical step when you notice a change in sex drive on Wegovy is to look at the official source. The Wegovy Summary of Product Characteristics (searchable on the Electronic Medicines Compendium (eMC)) lists the recognised side effects from clinical trials. Changes to libido do not appear there. That absence matters: it means the clinical trials did not identify a statistically consistent, drug-related pattern across the thousands of participants in the STEP programme.

That does not mean your experience is not real. Post-marketing surveillance and patient reports capture effects that trials, run over a defined period with specific endpoints, sometimes miss, particularly subjective experiences like sexual interest. The MHRA's Yellow Card scheme exists precisely for this gap: if you notice something unexpected, reporting it contributes to the ongoing safety picture for every patient who follows you.

So the honest starting point is: the medicine itself has not been shown to lower libido directly, but the clinical story does not end there. Several things happen during Wegovy treatment that can influence sex drive indirectly, and understanding them makes the experience easier to interpret. You can read a broader account of the side effects from Wegovy that have been reported across both trial data and patient experience on our dedicated page.

Step 2: Recognise the indirect routes, GI effects, fatigue and early-treatment adjustment

The side effects that do appear consistently in the trial data are gastrointestinal: nausea, loose stools, indigestion, bloating, and sometimes vomiting, particularly after a dose increase. These are the body adjusting to slower gastric emptying and altered gut-hormone signalling. For most people they settle within a week or two at a given dose, but while they are present they are genuinely draining.

Feeling nauseated, tired or physically uncomfortable is not a recipe for high libido. This is not a pharmacological action on sex hormones, it is a simple, human response to feeling unwell. If your interest in sex dropped in the weeks after starting or increasing your dose and has since recovered, that pattern fits the typical GI adjustment curve rather than a persistent drug effect. Our page on how long Wegovy side effects tend to last covers this timeline in more detail.

Fatigue, another reported experience during early treatment, can compound this. Eating significantly less while your body adapts means some people feel lower in energy before the metabolic benefits of weight loss come through. A one-minute habit worth building: check in with your energy level and mood each morning for the first four to six weeks and make a brief note. If you are curious whether what you are feeling is typical, it helps to understand what the Wegovy .5 starting dose commonly brings in terms of side effects for new starters. If you notice a consistent downward trend in mood rather than the fluctuation that tracks with nausea and tiredness, that is a conversation to have with your prescriber promptly, not something to wait out.

Step 3: Consider the other direction, libido may improve with weight loss

There is a body of evidence linking excess weight to reduced sexual function and lower libido in both men and women, through routes including testosterone levels, oestrogen balance, cardiovascular fitness, self-image and chronic inflammation. As weight falls on Wegovy (in the STEP 1 trial, participants lost around 15% of body weight on average over 68 weeks, a finding reported in the New England Journal of Medicine) many of these factors shift in a direction that can support sexual health rather than undermine it.

Some patients specifically report an improvement in libido over the course of treatment as weight falls, energy rises and self-confidence changes. The picture is genuinely mixed, and individual variation is large, and it is worth knowing that a meaningful proportion of people report no side effects on Wegovy at all, particularly once the early adjustment period has passed. What matters is that your own experience is noticed, tracked and discussed with the team overseeing your treatment. Our prescribers at nume welcome these conversations as part of the ongoing clinical review process.

When to get medical help, and what not to wait on

Most of what is described above sits in the category of something to monitor and discuss at your next review. Some things do not. Contact a doctor or call 111 the same day if you notice a sudden, marked change in your mood, feelings of depression, or thoughts of self-harm while on Wegovy. These are listed in the patient information leaflet as potential effects requiring prompt medical attention, and the NHS semaglutide medicines page sets out the full list of warning signs clearly.

Also seek prompt help for any severe or persistent abdominal pain that radiates to your back, which can signal pancreatitis, a known but infrequent risk with GLP-1 medicines that the MHRA highlighted in a January 2026 Drug Safety Update. Swelling of the face, throat or tongue, difficulty breathing or a rapid heartbeat suggest an allergic reaction: call 999.

For anything less urgent (changes in libido, persistent fatigue, mood that feels flat but not critical) use your aftercare contact. At nume, prescriber support is available seven days a week. You can also reach the team via our contact page or read answers to common questions in our FAQs. And if you are in the stage of thinking about whether Wegovy is the right choice for you, our clinical team profile at Mostafa Damghani's page gives a sense of who reviews each consultation.