IUD and Mounjaro: Does Tirzepatide Affect Your Coil? (October 2026)

01 · The core answer

Does Mounjaro affect an IUD?

The contraception warning for Mounjaro is specific: it can reduce the absorption of oral contraceptives, because tirzepatide slows how quickly the stomach empties.⁷² That is a problem for anything you swallow. A coil sits in the womb and is never absorbed through the gut, so the mechanism behind the warning has nothing to act on.

That is why the question is usually answered reassuringly. It is still sensible to tell the prescriber reviewing your treatment which contraception you use. Our guide on whether Mounjaro affects a Mirena coil covers the hormonal coil specifically.

02 · What to do next

What should you do if you have a coil and are considering Mounjaro?

Tell the prescriber about your coil during the consultation, then carry on as normal. If you also take a contraceptive pill, switch to a non-oral method or add a barrier method (such as condoms) for 4 weeks after starting Mounjaro and for 4 weeks after each dose increase. Our consultation is free and is reviewed by a GPhC-registered prescriber, and it asks about your medicines and health so that treatment is suitable for you.

If you use an IUD and have no other medical concerns, there is nothing you need to swap or add because of the stomach-emptying effect. If you also take a contraceptive pill alongside a coil, for example for period control, mention it, because the pill is the part the warning applies to.

03 · Why the warning exists

Why the contraception warning exists

Tirzepatide activates the GIP and GLP-1 receptors, which helps regulate appetite and slows how quickly the stomach empties.² Slower emptying is part of why people feel fuller sooner. It is also the reason for the contraception caution, because a tablet may be absorbed less reliably when it sits in the stomach for longer.⁷

This is a statement about absorption of medicines taken by mouth. It is not a statement that tirzepatide changes how hormones work in the body, and it does not say anything about devices placed in the womb. Reading the warning as 'Mounjaro affects all birth control' goes further than the guidance does.

04 · Hormonal and copper coils

Hormonal coils, copper coils and Mirena

A Mirena is a hormonal coil, and a copper IUD is hormone-free. Neither is taken by mouth, so the absorption concern behind the Mounjaro caution is not the relevant question for either type.⁷

People often assume a hormonal coil behaves like the pill. It does not reach the body through the gut in the same way, which is why the pill warning is not simply transferred across. Our page on Mounjaro and the Mirena coil goes into the hormonal device in more detail.

Your fitter or sexual health clinic can tell you how well your particular device protects you and when it is due for replacement.

05 · Pills versus coils

How coils compare with pills on Mounjaro

The practical difference is simple: a pill depends on absorption through the stomach and gut, while a coil does not. That is the whole reason guidance treats them differently.⁷

If you use a progestogen-only pill, our page on Mounjaro and desogestrel explains how the caution applies to that pill.

If you are on a pill and want to know whether a coil would suit you better, that is a conversation for your GP or a sexual health clinic. It is not something to change without advice.

06 · Emergency contraception

What about emergency contraception?

Some emergency options are tablets, and tablets fall under the same absorption concern as other oral medicines on Mounjaro.⁷

If you need emergency contraception while taking Mounjaro, speak to a pharmacist, sexual health clinic or GP promptly and tell them you use the medicine. They can advise on which option suits you.

07 · Weight and contraception

Weight loss, Mirena and hormonal contraception

Many readers ask whether a coil or hormonal contraception makes weight loss harder, or whether a coil causes weight loss.

In the SURMOUNT-1 trial of adults taking tirzepatide alongside diet and exercise, average weight loss was substantial over 72 weeks compared with lifestyle changes alone. These are trial averages and individual results vary.² Treatment works alongside a reduced-calorie diet and increased physical activity, not instead of them.

No contraceptive pill or coil is a weight-loss treatment. If you believe your contraception is affecting your weight, discuss it with your GP or a sexual health clinician rather than changing method on your own. For a broader view of how we support weight management, see our weight loss clinic.

08 · Pregnancy and conception

Conception, pregnancy and having a coil removed

Mounjaro is a weight-management and type 2 diabetes treatment, not a contraceptive, so it is not a substitute for contraception. It must not be used during pregnancy, and it should be stopped at least one month before trying to conceive. If you become pregnant during treatment, stop the medicine and tell your prescriber promptly.

If you plan to have a coil removed in order to try for a baby, or think you may be pregnant, tell your prescriber before continuing. Tirzepatide has a half-life of about five days, so after a final dose it takes roughly four to five weeks to clear the system, and nothing needs doing while it clears.² Your prescriber can advise on timing for your circumstances.

09 · Coil-related symptoms

New symptoms while on Mounjaro with a coil

If you notice something new, do not assume either cause.

Contact the clinician who fitted your coil, or your GP, for anything that worries you. If you have 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 the skin or eyes (possible gallbladder problems); or signs of a severe allergic reaction such as swelling of the face or throat and difficulty breathing, seek immediate medical help. Let your prescriber know too, so your treatment record is accurate. You can report a suspected side effect through the MHRA Yellow Card scheme.¹⁹

Some readers also ask about gynaecological conditions alongside treatment. Our page on Mounjaro and fibroids covers that topic, and Mounjaro and circulation covers questions about blood flow.

10 · Getting treatment safely

How to start Mounjaro if you use an IUD

Starting is straightforward: complete the free online consultation, where you can list your contraception, medicines and health history. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.

Approved orders are dispensed by our registered pharmacy (GPhC 9012878) and sent by free next-day tracked delivery in temperature-controlled packaging, with same-day dispatch when ordered by 3pm. Needles, a sharps bin and injection guidance are included, and monthly reviews and side-effect support continue after your first order.¹²

Mounjaro is a prescription-only medicine, used alongside a reduced-calorie diet and increased physical activity. Individual results vary, and this page is information rather than a substitute for medical advice.