Mounjaro® Injectable Pen

Images are for illustration purposes only.

Begin your journey to treat Weight Loss with our online assessment. Once completed, you can review and select from the most suitable treatment options.

Mounjaro® Injectable Pen

GLP-1 Injectables Pens

From
£169.99

Treatment options

£169.99

Order before 11:00 AM to get it by in 2 Days* using Express delivery

  • Dual-action GIP & GLP-1 formula
  • Simple once-weekly injection
  • Up to 20% weight loss in studies
  • Easy, prefilled pen design
  • No subscriptions, lowest price guarantee
We maintain the highest possible regulation for a UK online pharmacy, ensuring your experience is safe, and confidential.

Buy Mounjaro® (Tirzepatide) Weight Loss Injection Pen Online – Once-Weekly Treatment for Effective Results

Mounjaro® (tirzepatide) is a once-weekly injectable treatment clinically proven to help reduce body weight and improve blood sugar control. It works by targeting both GIP and GLP-1 receptors, helping to regulate appetite, slow digestion, and support long-term weight management.

Each prefilled Mounjaro® pen delivers a precise dose designed for safe, easy self-injection. Start with a low dose and gradually increase as advised to minimise side effects while maximising results.

Ideal for adults managing weight or type 2 diabetes, Mounjaro® offers an advanced, doctor-approved approach to achieving sustainable weight loss.

Image

Table of contents

Description
How To Use
Ingredients
Side Effects & Warning

About Mounjaro® Injectable Pen

About Mounjaro® (Tirzepatide) Injectable Pen

Mounjaro® contains tirzepatide, a once-weekly injectable medicine used to help manage type 2 diabetes and, in some cases, weight management in adults. It works by improving blood sugar control and supporting weight loss when combined with diet and lifestyle changes.

What the medicine is

  • Pre-filled, single-use injectable pens available in strengths from 2.5 mg to 15 mg.
  • Each pen delivers one dose of tirzepatide for subcutaneous injection.

How it works

  • Tirzepatide is a dual GIP and GLP-1 receptor agonist.
  • It helps regulate blood sugar by increasing insulin release and lowering glucagon levels in response to meals.
  • Slows gastric emptying and reduces appetite, which supports weight reduction.

What it is used for

  • Improving glycaemic control in adults with type 2 diabetes, alongside diet and exercise.
  • May also be prescribed for weight management in eligible adults.

Benefits

  • Once-weekly dosing with a simple pen device.
  • Improves blood sugar control and supports weight loss.
  • Shown in trials to reduce cardiovascular risk factors in people with type 2 diabetes.

How to Use Mounjaro® Injectable Pen

Directions for Use

  • Mounjaro is injected once weekly, on the same day each week, under the skin (subcutaneous) in the abdomen, thigh, or upper arm.
  • Rotate injection sites each week.
  • Starting dose is usually 2.5 mg once weekly, increasing gradually every 4 weeks (to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and up to 15 mg) as tolerated and directed by your doctor.
  • The pen is single-use and pre-filled — inject the full dose then dispose safely.

Special advice

  • Can be taken with or without food.
  • If using contraception, use an additional method for 4 weeks after starting or increasing dose (due to delayed absorption of oral contraceptives).

Missed dose

  • If less than 4 days (96 hours) late, take the missed dose as soon as remembered, then continue as normal.
  • If more than 4 days late, skip the dose and resume with the next scheduled injection.

Storage

  • Store in a refrigerator (2–8°C) until use; can be kept at room temperature (<30°C) for up to 21 days.
  • Do not freeze. Protect from light.

When to seek medical review

  • If you experience persistent or severe gastrointestinal side effects.
  • If you develop severe abdominal pain (possible pancreatitis).
  • If your blood sugars remain uncontrolled despite treatment.

Ingredients

Ingredients

Active ingredient: Tirzepatide (2.5 mg, 5 mg, 7.5 mg, 10 mg, 12.5 mg, or 15 mg per dose, depending on pen strength).

Other ingredients: Water for injections, buffers, and stabilisers (may include citric acid, sodium hydroxide).

Each pre-filled pen is single-use and delivers one subcutaneous injection.

Side Effects & Warnings

Warnings and Side Effects

Do not use if you:

  • Are allergic to tirzepatide or any ingredient in the pen.
  • Have a personal or family history of medullary thyroid carcinoma or MEN2 syndrome.

Seek medical advice before use if you:

  • Have pancreatitis or a history of severe gastrointestinal disease.
  • Have severe kidney or liver problems.
  • Are taking insulin or sulfonylureas (risk of hypoglycaemia may increase).
  • Are pregnant, planning pregnancy, or breastfeeding.

Important interactions

  • May slow stomach emptying, which can affect absorption of other oral medicines (especially contraceptives, antibiotics, thyroid hormones).

Possible side effects

  • Very common: Nausea, diarrhoea, reduced appetite.
  • Common: Vomiting, constipation, abdominal pain, tiredness, indigestion.
  • Uncommon: Gallstones, injection site reactions, dizziness.
  • Rare/serious: Pancreatitis (severe abdominal pain), severe allergic reactions, hypoglycaemia (especially if combined with insulin or sulfonylurea).

Seek urgent help if you develop severe abdominal pain (possible pancreatitis), swelling of face/lips, breathing difficulties, or signs of a severe allergic reaction.

Frequently asked questions

Everything you need to know about the product and billing.

Clinically proven treatments delivered discreetly to your door.