Mounjaro

Weekly injection (pen) · Eli Lilly
PRESCRIPTION MEDICINE

Mounjaro is a weekly injection (pen) made by Eli Lilly that contains Tirzepatide 2.5 to 15 mg (several strengths). Tirzepatide is a weekly diabetes and weight-loss injection (gip/glp-1): lowers blood sugar in type 2 diabetes and helps weight loss by reducing appetite.

Ingredient (salt)Amount
Tirzepatide2.5 to 15 mg (several strengths)

What it is used for

Lowers blood sugar in type 2 diabetes and helps weight loss by reducing appetite.

How it works

A weekly injection acting on two gut hormones (GIP and GLP-1), giving strong sugar and weight reduction.

How to take it

Inject once a week on the same day; the dose is increased every 4 weeks.

Common side effects

  • Nausea
  • Diarrhoea
  • Vomiting
  • Constipation
  • Reduced appetite

Get medical help straight away if

  • Severe stomach pain (pancreatitis)
  • Gallbladder pain
  • Severe dehydration

Be careful

Nausea, vomiting and diarrhoea are common at first. Not for people with a family history of medullary thyroid cancer.

Other medicines and interactions

May make the contraceptive pill less reliable for 4 weeks after starting or dose increases; use a barrier method. Low sugar more likely with insulin or sulfonylureas.

Pregnancy and breastfeeding

Not for use in pregnancy or while breastfeeding; stop at least a month before trying to conceive.

Common questions

What is Mounjaro?

Mounjaro is a weekly injection (pen) by Eli Lilly containing Tirzepatide 2.5 to 15 mg (several strengths).

What is Mounjaro used for?

Lowers blood sugar in type 2 diabetes and helps weight loss by reducing appetite.

How should I take Mounjaro?

Inject once a week on the same day; the dose is increased every 4 weeks. Always follow the dose your doctor or the pack gives.

What are the side effects of Mounjaro?

Common side effects include: Nausea, diarrhoea, vomiting, constipation, reduced appetite. Get medical help straight away for: Severe stomach pain (pancreatitis), gallbladder pain, severe dehydration.

Does Mounjaro need a prescription?

Yes. In India it is a prescription (Schedule H) medicine, so a pharmacist should sell it only with a doctor's prescription.

Can I take Mounjaro in pregnancy or while breastfeeding?

Not for use in pregnancy or while breastfeeding; stop at least a month before trying to conceive.

What are the substitutes for Mounjaro?

We have no other brand with exactly the same composition and strength in our list yet. Ask your pharmacist for an equivalent.

Sources and further reading

NHS (UK National Health Service) and MedlinePlus (US National Library of Medicine) are free, reviewed medicine guides. Brand names and doses there may differ from India.

Composition checked against pack details from large Indian online pharmacies. Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. This page is a plain-language summary written from standard prescribing information and the public guides linked below. Brands sometimes change their formula, so always check the composition printed on the pack. Doses here are typical adult doses; yours may differ. Do not start, stop or change a medicine without your doctor or pharmacist, and keep all medicines away from children. In an emergency, call 112 (India) or your local emergency number.