Can Mounjaro affect your libido?

Quick answer

There is no strong evidence that Mounjaro directly raises or lowers sexual desire. Nausea, fatigue, mood, other medicines and health changes can affect libido; seek a review if a change persists or troubles you rather than changing treatment yourself.

Your sex drive may change while taking Mounjaro, but there is not good evidence that it directly increases or reduces libido. Changes in energy, mood, body confidence, illness or side effects may contribute. Persistent or distressing changes deserve a review of your health and medicines, rather than assuming weight is the only explanation.

What is libido, and what is it not?

Libido means sexual desire. It is different from erections, vaginal lubrication, orgasm and fertility, although these can influence one another. There is no single normal level of desire: what matters is whether a change troubles you. You do not need to lose weight to deserve care for sexual difficulties.

Could better metabolic health make a difference?

Better management of diabetes, sleep problems or limited mobility may help some people feel more comfortable and energetic. Changes in self-image may also matter. These are plausible indirect effects, not proof that tirzepatide acts as a sexual-desire treatment. Improvement in erectile function in a study would not, by itself, demonstrate improvement in libido.

Why might desire fall during treatment?

Nausea, fatigue, discomfort, dehydration or eating too little may make sex less appealing. Stress, depression, relationship difficulties, vaginal dryness and menopause are other common explanations. Antidepressants and some other medicines can affect desire too. A symptom occurring after a new prescription is worth investigating, but timing alone cannot show which factor caused it.

What evidence supports using Mounjaro for low desire?

Mounjaro is not licensed to treat low libido. Robust trials specifically measuring sexual desire with tirzepatide are lacking. Research about weight change, sexual function or other medicines cannot reliably predict what will happen to your desire. Reports online may be genuine experiences, but they cannot establish the frequency or cause of a drug effect.

What should you do if your libido changes?

Tell your prescriber when the change began, whether it followed a dose increase, and whether you also have pain, poor sleep, low mood or reduced food intake. They can review other medicines and consider targeted investigations when the history suggests a hormonal or other medical cause. Do not stop an antidepressant or alter your injection schedule yourself. Treatment may involve addressing dryness, mental health or relationship concerns, not another weight prescription.

When should you seek help sooner?

Seek review if the change persists or causes distress, or if you have new erectile difficulties, painful sex or genital symptoms. Seek urgent medical help for severe persistent abdominal pain, repeated vomiting or inability to keep fluids down. If you feel unsafe or at risk of harming yourself, seek immediate crisis or emergency support.

Does changed desire affect contraception advice?

Desire is not a measure of fertility. Use effective contraception if pregnancy is possible. Tirzepatide can reduce pill effectiveness: switch to a non-oral contraceptive or add a barrier method for four weeks after starting and after every dose increase. Follow contraceptive instructions if vomiting or diarrhoea occurs. Stop tirzepatide at least one month before attempting pregnancy and seek a planned medication review.

Sources & further reading

Reviewed by

Dr Chinnadorai Rajeswaran

Specialist Endocrinologist · MBBS MRCP FRCP

Last Reviewed: November 2026

Read about erectile dysfunction and related care.