Does GLP-1 Increase Libido? (October 2026)

01 · The core answer

Does GLP-1 increase libido? The honest short answer

Mounjaro is licensed for weight management in adults and for type 2 diabetes.¹ Sexual desire is not one of its licensed purposes.¹ Changes in sex drive are not listed as a side effect in the UK patient leaflet.¹³

That does not mean your experience is imaginary. Sex drive is shaped by sleep, stress, mood, relationships, other medicines, alcohol, general health and how you feel about your body. Starting any new treatment, changing what you eat and losing weight can all shift several of those together.

Our wider GLP-1 and libido guide and our page on Mounjaro and sex drive cover the same ground from other angles.

If the question you are really asking is why the same medicine seems to do opposite things to different people, the answer is that it probably is not the medicine alone. Our page on whether these medicines affect libido looks at that uncertainty in more depth.

If you are considering treatment and worried about sex drive, you do not need to settle the question first. A reviewed consultation lets you raise it with a prescriber who sees your full health picture. Tell them about any medicines you take, any existing concerns about desire, and your mood and sleep. That conversation is more useful than any online claim.

If you are already on treatment and notice a change, keep taking notes on when it started, what else changed that week, and how severe it is. Then talk to your prescriber rather than stopping or adjusting anything on your own. Our page on loss of libido walks through that conversation.

Mounjaro is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. It is used alongside a reduced-calorie diet and increased physical activity. Individual results vary, and this page is information, not a substitute for medical advice.

02 · What the evidence says

What the evidence says about GLP-1 and libido

Mounjaro's licensed uses are weight management and type 2 diabetes.¹ A change in libido is not listed as a side effect in the patient leaflet.¹³

Libido is not a listed effect, so nobody can say the medicine raises or lowers desire. It does not prove that nobody has ever experienced a change while on treatment.

That is why the Yellow Card scheme exists. If you notice a new symptom after starting treatment, whether or not it appears in the leaflet, you can report it through the MHRA Yellow Card scheme.¹⁹

You will find plenty of material online, from forum threads to social posts to articles with confident headlines, claiming a so-called happy side effect or the reverse. They cannot tell us whether the medicine caused the change, whether something else did, or how often it occurs. A person who feels more confident after weight loss and a person who feels more tired after a restricted diet are both telling the truth about their experience, but neither is telling us about the medicine's effect on desire.

In practical terms, treat libido as a quality-of-life matter to raise with your prescriber, not as a benefit to expect or a risk to fear.

03 · Mechanism and desire

How the mechanism relates to sex drive

Tirzepatide is the first treatment of its kind to activate two natural gut-hormone receptors at once: GIP and GLP-1.¹ Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin.¹ In practice, most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet.¹

Nothing in that description mentions desire, arousal or sexual response.

People often ask about the brain, and specifically about reward and dopamine, because appetite and pleasure feel connected. That is a reasonable curiosity, and we have a separate page on whether GLP-1 increases dopamine. The point to hold on to is that interest in a mechanism is not the same as an established effect.

It is also worth remembering that slowing stomach emptying and reducing hunger change daily life in ways that can be felt.

If you want a general explainer of how gut hormones behave, our guides on how to increase natural GLP-1 and how to increase GLP-1 cover the appetite side.

Treat any claim that bridges the two with caution.

04 · Weight loss and wellbeing

Weight loss, confidence and indirect effects

Some people feel more comfortable in their body as weight comes down, and that can plausibly change how they feel about intimacy, but it cannot be promised. That is a possibility, not an outcome you should plan around.

In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone.² These are trial averages, and individual results vary.² Trial averages do not predict your own result.

It helps to think about the pathways separately. Weight change might affect how you feel about your body. Changing your eating might affect your energy. A new routine, a new injection habit and a new set of expectations might affect your mood. Each of those could push desire up or down for different people, and they can also cancel each other out. That is why a mixed picture is what you would expect, even if the medicine itself does nothing directly.

There is also the reverse possibility. Some people feel tired, low or preoccupied during dose changes, and tiredness is a common reason for lower interest in sex whatever its cause. If that sounds like you, it is worth mentioning at your monthly review, because your prescriber may be able to look at your dose, your diet and your wellbeing together.

Weight loss treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.² Treat any change in desire, up or down, as something to observe and discuss, not something to chase.

05 · If your libido changes

What to do if your libido changes on treatment

If your sex drive changes after starting treatment, tell your prescriber and keep taking the medicine as directed until you have spoken. Do not stop, skip or change a dose on your own because of a hunch. A conversation lets someone who knows your history weigh up the possible causes with you.

Before the conversation, it helps to gather some simple information. Note when you noticed the change and whether it came on gradually or suddenly. Think about whether you changed dose around the same time. Consider what else was different that week, such as sleep, stress, alcohol, new medicines, illness or relationship pressures. Mention whether the change is bothering you, because that affects how worth exploring it is.

Ongoing monthly reviews, dose-titration and follow-up assessments by the prescribing team are included, with side-effect support. That is the right place for this topic, and nothing you say about sexual wellbeing is out of scope. Repeat orders re-check suitability, so there is a regular point at which your circumstances are looked at again.

You can also report the change through the MHRA Yellow Card scheme.¹⁹ In fact, new or unlisted symptoms are exactly what the scheme is for.

Some people find the change goes the other way and they feel more interested than before. That is also worth mentioning if you are curious, and it is equally unproven as an effect of the medicine. You do not need to feel awkward about either direction.

If you feel very low, anxious or distressed, speak to a prescriber or your GP promptly. If you have thoughts of harming yourself or ending your life, get help straight away: call 999 or go to A&E if you are in immediate danger, call NHS 111 and choose the mental health option, or call Samaritans free on 116 123, day or night. Libido is rarely the only thing going on when someone is struggling.

06 · Other causes of low desire

What else could be affecting your sex drive

A change in desire during treatment often has causes that are unrelated to the medicine, and it is worth looking at them before drawing conclusions.

Stress and tiredness are among the most common influences on desire. A busy period at work, disrupted sleep, caring responsibilities or worries about money can all make intimacy feel less appealing. Starting a new treatment can itself be a source of pressure, because you may be changing your eating, your routine and your expectations at the same time.

Mood matters too. Feeling low or anxious can reduce interest in many things, including sex. If your mood has changed, that deserves its own attention, and you should not assume it is down to any medicine. A prescriber or your GP can talk it through with you.

Relationships are another factor. Changes in how you feel about your body, how your partner responds, or how much time and privacy you have together can all shift desire. These are real influences even though they cannot be measured in a trial.

Other medicines and substances can play a part as well. Alcohol, some prescription medicines and some over-the-counter products can affect how you feel. That is why it is important to tell your prescriber about everything you take.

General health also counts. Long-term conditions, pain, illness and recovery from illness can all lower desire. Long-term conditions, including type 2 diabetes, for which Mounjaro is also licensed,¹ can affect wellbeing generally, which is another reason to raise concerns openly.

Finally, remember that desire varies naturally across a lifetime and from week to week. There is no single age or level that counts as normal, and comparing yourself with a headline or a stranger's post is rarely useful. What matters is whether the change is bothering you. If it is, ask for support, and if it is not, there is nothing to fix.

Looking at these influences together is the sensible approach. It lets you and your prescriber decide whether the medicine deserves a closer look or whether the explanation lies elsewhere.

07 · Libido boosters and quick fixes

Libido boosters, quick fixes and why we are cautious

We do not recommend adding a libido booster to weight-loss treatment on your own initiative.

The first concern is safety. Whether something is safe for you depends on your health, your other medicines and your history. That is a decision for a prescriber who knows you, not for a list.

The second concern is counterfeits and unregulated sellers. Products marketed online as natural libido enhancers, or sold by sellers offering to supply without a consultation or prescription, carry risks because you cannot be sure what is in them. Dramatic claims should make you more suspicious, not less. Always check that a pharmacy is on the GPhC register; ours is GPhC 9012878.

The third concern is the timing of the advice. If your libido has changed, the useful first step is to understand why, not to cover it with a product.

The fourth concern is expectation. Marketing for supplements and so-called boosters often implies dependable results. Treatments for sexual function, where they are appropriate, are prescribed after an assessment, and results still vary between people.

If you simply want to understand your options, bring the question to your monthly review or to your GP, and ask what is appropriate for you. That route is slower than a headline but far more likely to help.

08 · Reporting and review

Reporting side effects and getting the most from reviews

Reporting an unexpected change and discussing it at review are the two most useful things you can do. They protect you and help others, and neither requires you to prove the medicine caused anything.

The Yellow Card scheme is run by the MHRA, and anyone can use it, including patients.¹⁹ You can report a suspected side effect even if it is not listed in the leaflet, even if you are unsure of the cause, and even if the symptom seems minor or embarrassing. Describe what happened, when it started, which medicine you take and your dose.

At your monthly review, the prescribing team can talk through how treatment is going, including dose and wellbeing. Mounjaro is taken once weekly, starting on 2.5mg, with at least 4 weeks on each dose depending on how you respond.¹ If a change in desire seems to coincide with a step up, tell your prescriber, because that detail helps them think it through.

Remember the timeline too. Tirzepatide has a half-life of about five days, so after a final dose it takes roughly 4–5 weeks to clear the system, and there is no way to speed this up.¹ That means stopping does not produce an immediate change in the body, and it is another reason to talk before you decide to stop. If you do stop with your prescriber's agreement, nothing needs doing while the medicine clears.

Keep a short note of changes over time. A simple log of mood, energy, sleep and desire gives you a clearer picture than memory, and it makes review conversations more productive.

Support is available Monday to Friday, 9am to 5pm, by email at support@everydaymeds.co.uk, through the account portal chat, or by phone on 0333 207 0413. You are welcome to raise sensitive topics, and you will be treated with discretion.

09 · Serious side effects

Serious side effects: when to get help straight away

Serious side effects are uncommon but need urgent attention. Seek immediate medical help for: severe, persistent stomach pain that may spread to your back, with or without vomiting (possible pancreatitis); pain in the upper right abdomen, fever or yellowing of skin/eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing. If you take insulin or a sulfonylurea alongside Mounjaro, watch for low blood sugar (shakiness, sweating, confusion) — your prescriber may need to adjust those medicines.¹

10 · NHS and private routes

Getting treatment: NHS and private routes

Mounjaro is available on the NHS, but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the NHS primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴⁵ Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment rather than waiting.

If you are on the NHS route, raise any concern about libido with your GP or the clinician managing your treatment. If you choose a private route, make sure the pharmacy is registered and that a prescriber reviews you. Ours is a GPhC-registered pharmacy, and the Mounjaro we supply is genuine, sourced through official LillyDirect supply from Eli Lilly's UK distribution.

Ordering follows a short, clear sequence. You complete a free online consultation, which is a short health questionnaire with no charge and no obligation. A GPhC-registered prescriber reviews it; payment is taken when you place the order, and if the prescriber decides the treatment is not suitable, the order is refunded automatically in full. Then your order is dispensed by our registered pharmacy, with same-day dispatch when ordered by 3pm, and delivered free next day in discreet, temperature-controlled packaging. Saturday delivery is £14.99.

Needles, a sharps bin and injection guidance come with every order. Repeat orders re-check suitability, and there is no auto-shipping and no subscription. You can pay by Visa, Mastercard or Klarna, with pay-monthly options.

Wegovy is another licensed option, and NHS access to Wegovy runs through specialist weight-management services, so ask your GP.