Why Did I Get a Bruise From My Mounjaro Shot? (October 2026)

01 · Next steps

What should I do about a bruise from my Mounjaro shot?

Start by noting what you see: where the bruise is, how big it is, and whether it is painful or changing. Then read the section on injecting in the patient information leaflet¹³ that comes with your pen, and follow the pen's instructions every week.

Mounjaro is a prescription medicine, so any new effect after an injection is worth raising with the prescribing team.

If you want to report it, the Yellow Card scheme accepts reports of suspected side effects from patients.¹⁹

02 · Getting Mounjaro

If you are still deciding on treatment

The Mounjaro pen starts at £169.99 per month for the 2.5mg starter, and all six doses are in stock. Your first 2.5mg pen costs £129.99 with code FIRST40. Every later order is £25 off the standard price (code DOSE25). Prices checked 11 October 2026.

Ordering works in three steps:

• Complete a free online consultation. There is no charge and no obligation.
• A GPhC-registered prescriber reviews it. Unsuitable orders are refunded automatically.
• We dispense and dispatch, with free next-day tracked delivery. Same-day dispatch applies when you order by 3pm.

Needles, a sharps bin and injection guidance come with every order. You can start your free consultation whenever you are ready.

Related guide: Buy Mounjaro.

Related guide: Bruise from glp 1 shot.

03 · Reading your bruise

How do I tell a bruise from a haematoma?

A bruise and a haematoma can look similar, and only a clinician who examines the area can say which it is.

Useful details are the size, the colour, whether the area is raised or tender, and how it changes from day to day. A photo taken each day can help that conversation.

The leaflet¹³ and your prescriber are the right places for that.

04 · When to seek help

When should a bruise be checked?

Contact your clinical team if a reaction is spreading, hot, very painful, or lasts more than a week. Speak to your prescriber, your GP or NHS 111, and treat anything urgent as urgent.

If you are worried about infection or feel unwell, get medical help straight away.

You can also report a suspected side effect to the MHRA through the Yellow Card scheme.¹⁹ Our prescribing team also offers side-effect support as part of ongoing monthly reviews.

05 · Technique and other injection effects

How can I avoid bruising?

Rotate the injection site with each dose, and follow the injection steps in the patient information leaflet every week.¹³ That includes how to use the pen and where to inject. If you are unsure about a step, ask your prescriber or pharmacist to talk you through it instead of adjusting your technique yourself.

Tell your prescriber about every medicine you take, including anything you buy over the counter, so they can review your whole picture. They can then advise you on anything that is relevant.

Other injection questions have their own guides. See why a Mounjaro injection can hurt, why a shot may sting, and what to do if you miss a shot.

06 · 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