Fat Loss Injections in Portsmouth: Clinic Jabs vs Mounjaro (October 2026)

01 · Decide

Which fat loss injection is right for you?

It depends on your goal: fat-dissolving injections are aimed at a small, stubborn area, whereas Mounjaro is a medicine for weight management across the whole body. Local clinics in the Portsmouth area advertise treatments such as Aqualyx for areas like the chin, abdomen, flanks and thighs. We are an online pharmacy and do not provide those treatments. Ask any clinic about the practitioner's qualifications, what the product is, and what the risks are before booking.

If your aim is to lose weight overall, a local injection to one area is not designed for that. If you want to lose weight overall and meet the criteria, the Mounjaro pen is the route we offer. See our guide on whether fat loss injections work and our page on fat loss injection safety for more.

02 · Cost

What Mounjaro costs and how ordering works

Each pen lasts four weeks, and the standard price rises with the dose. A new customer saves £40 on their first order at any dose with code FIRST40, and every later order is £25 off the standard price (code DOSE25). If you step up after 4 weeks on each dose, your first four pens (2.5mg to 10mg) cost £959.96 at standard prices. A first year costs £2,711.88 if you settle at 5mg, up to £3,599.88 at 15mg, before discounts. All six doses are in stock.

Compare this with the wider picture on our page for Mounjaro fat loss injection prices. Across the UK pharmacies we track, starting pens range from £143.96 to £179.99 (checked 11 October 2026).

Ordering takes three steps:

• Complete the free online consultation, a short health questionnaire with no obligation.
• A GPhC-registered prescriber reviews it. Payment is taken when you place the order; if the prescriber decides the treatment is not suitable, the order is refunded automatically in full.
• We dispense and dispatch, with same-day dispatch when ordered by 3pm and free next-day tracked delivery in temperature-controlled packaging.

Start your free consultation from anywhere in Portsmouth, Southsea, Fareham or Gosport. Support is available Monday to Friday, 9am to 5pm.

03 · What Mounjaro is

What Mounjaro is and how it works

Mounjaro is the brand name for tirzepatide, a once-weekly injectable prescription medicine made by Eli Lilly. In the UK it is licensed for weight management in adults and for type 2 diabetes. It comes as a pre-filled multi-dose pen (KwikPen) in six strengths: 2.5mg, 5mg, 7.5mg, 10mg, 12.5mg and 15mg.¹

Tirzepatide activates two natural gut-hormone receptors at once, GIP and GLP-1. Together these help regulate appetite, slow how quickly the stomach empties, and improve the way the body responds to insulin. Most people feel fuller sooner and less hungry between meals, which supports a reduced-calorie diet.¹

It is not a spot treatment. It does not target one area, so we cannot promise belly, chin or arm fat will change first. For area-specific questions see our pages on chin fat loss injections and fat loss injections for arms.

04 · Evidence and pace

What the evidence shows

In the SURMOUNT-1 trial of 2,539 adults, people taking tirzepatide alongside diet and exercise lost on average 15% of their body weight on 5mg, 19.5% on 10mg and 20.9% on 15mg over 72 weeks, compared with 3.1% with lifestyle changes alone.² These are trial averages and individual results vary. For someone starting at 100 kg, 20.9% is about 21 kg.

At 72 weeks, 85% of participants on 5mg, 89% on 10mg and 91% on 15mg had lost at least 5% of their body weight. Half of participants on 10mg and 57% on 15mg lost at least 20%.²

Weight loss is gradual by design. The first weeks on 2.5mg are an adjustment phase and losses are usually modest. Most measurable progress builds from 5mg onward, month by month, so think in months, not days. If you have lost less than 5% of your starting weight after 6 months on the highest dose you can tolerate, your prescriber will discuss whether continuing or stopping is right for you.¹

05 · Who can use it

Who can use Mounjaro

Mounjaro is licensed for weight management in adults with a BMI of 30 or above, or a BMI between 27 and 30 with at least one weight-related condition such as high blood pressure, high cholesterol, obstructive sleep apnoea, cardiovascular disease, prediabetes or type 2 diabetes. It must be used alongside a reduced-calorie diet and increased physical activity. A prescriber will assess your BMI, medical history and current medicines before deciding whether it is suitable.¹

On the NHS, Mounjaro is available but access is being phased in over several years. NICE recommends it for adults with a BMI of at least 35 plus at least one weight-related condition, and the primary-care rollout began in June 2025 with the highest-need groups first, initially BMI 40+ with four or more qualifying conditions.⁴⁶ Full rollout is expected to take years, which is why many people who meet the licensed criteria choose regulated private treatment.

06 · Dosing and injecting

Dosing, injecting and storage

Everyone starts on 2.5mg once a week. This starting dose is about letting your body adjust, not about weight loss itself. After at least 4 weeks the dose increases to 5mg, then can step up by 2.5mg at minimum 4-week intervals to a maximum of 15mg weekly. Many people settle at 5mg, 10mg or 15mg; higher is not automatically better.¹

Mounjaro is injected under the skin once a week, on the same day each week, at any time of day, with or without food. Licensed sites are the stomach area (at least 5cm from the belly button), the front of the thigh, or the back of the upper arm if someone else gives the injection. Rotate the site each dose. Each KwikPen contains four weekly doses.¹

Keep pens in a fridge at 2–8°C and never freeze them. Once in use, a pen can be kept not above 30°C for up to 30 days, then discarded.¹³ Needles, a sharps bin and injection guidance come with every order.

07 · Safe supply

Buying safely in Portsmouth

Only buy weight-loss injections from a registered pharmacy that requires a consultation and prescription. Be wary of anyone offering to supply without a consultation or prescription, as counterfeit medicine alerts are published by the MHRA.⁷ We are GPhC-registered (9012878), which you can check on the GPhC register,¹² and our Mounjaro comes through official LillyDirect supply as genuine KwikPens.

Report any suspected side effect through the Yellow Card scheme.¹⁹ Browse all weight loss treatments, or see local guides to weight loss injections in Portsmouth and tirzepatide injections in Portsmouth. Our online prescription guide and the blog on fat loss pills and tablets add more context.

Mounjaro (tirzepatide) is a prescription-only medicine, supplied only after an online consultation reviewed by a GPhC-registered prescriber. It is used alongside a reduced-calorie diet and increased physical activity. Individual results vary. This page is information, not a substitute for medical advice.

08 · 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