Body treatments
Weight-Loss Injections in Knightsbridge: The Doctor-Led Guide to GLP-1 Treatment
How semaglutide and tirzepatide work, who qualifies under UK prescribing rules, realistic results, side effects and how to manage them, what a medically supervised programme costs, and how to protect muscle and skin while you lose fat.
By Fatemeh, Founder & Lead Practitioner, Levirgo Aesthetics Clinic 18 min read
Reviewed December 2025 
What GLP-1 weight-loss injections are
GLP-1 (glucagon-like peptide-1) is a gut hormone released when you eat. It tells the brain you are full, slows how fast the stomach empties, and helps regulate blood sugar. Semaglutide and tirzepatide are engineered versions that stay active for about a week, so a single weekly injection keeps appetite lowered. Tirzepatide also acts on a second hormone pathway (GIP), which is thought to explain its slightly larger average effect.
| Semaglutide | Tirzepatide | |
|---|---|---|
| Hormone targets | GLP-1 | GLP-1 + GIP |
| Injection frequency | Once weekly | Once weekly |
| Average 12-month weight loss | ~10–12% of body weight | ~15–21% of body weight |
| Titration period | 16–20 weeks to full dose | 16–24 weeks to full dose |
Figures are trial averages; individual results vary widely with dose reached, adherence, nutrition and activity.
Who can have them — UK prescribing rules
A prescriber must confirm the treatment is clinically appropriate. In practice that usually means:
- A BMI of 30 or above, or
- A BMI of 27–29.9 with a weight-related health problem such as type 2 diabetes, high blood pressure, obstructive sleep apnoea, prediabetes or dyslipidaemia.
- Adjusted thresholds may apply for some ethnic backgrounds where cardiometabolic risk rises at a lower BMI.
Not suitable if
You are pregnant, breastfeeding or planning pregnancy; you or a close relative have had medullary thyroid carcinoma or MEN 2; you have had pancreatitis; you have severe gastrointestinal disease or gastroparesis; or you have a current eating disorder. Several other conditions need caution — a full history is taken at consultation.
Realistic results and timeline
Illustrative average trajectory. Loss is fastest in the first few months, then slows as the body reaches a new set point.
Most people notice reduced appetite and smaller portions within the first two weeks, before meaningful scale movement. Weight loss becomes obvious by weeks 6–12 and continues for roughly 12–18 months before plateauing. Maintenance — either a lower dose or sustained habit change — is what protects the result.
Side effects and how they’re managed
| Effect | How common | Management |
|---|---|---|
| Nausea | Very common early on | Slow titration, smaller meals, less fat and alcohol; usually settles in 1–2 weeks per dose step |
| Constipation or diarrhoea | Common | Fibre, fluids, movement; occasionally a laxative |
| Reflux, burping, early fullness | Common | Smaller portions, not lying down after eating |
| Fatigue, headache | Common early | Adequate calories and protein, hydration |
| Gallstones | Uncommon | Linked to rapid weight loss; report persistent right-upper-abdominal pain |
| Pancreatitis | Rare | Stop and seek urgent care for severe persistent abdominal pain radiating to the back |
The golden rule of titration
Only move to the next dose when the current one is comfortable. There is no prize for reaching the top dose quickly, and most people get excellent results below the maximum.
Protecting muscle and metabolism
When you lose weight quickly, some of it is lean tissue. Studies suggest 20–40% of the total lost on GLP-1 therapy without intervention can be muscle. Losing muscle lowers your resting metabolism and makes regain easier, so a good programme builds in:
- Protein target
Roughly 1.2–1.6 g of protein per kg of target body weight per day, spread across meals — often the hardest thing to hit when appetite is suppressed.
- Resistance training
Two to three sessions a week. This is the single most effective way to keep lean mass while losing fat.
- Adequate calories
Not eating dangerously little. A moderate deficit preserves more muscle than a severe one.
- Monitoring
Periodic body-composition checks, not just scale weight, so muscle loss is caught early.
See if GLP-1 treatment is right for you
Book a confidential assessment with our prescriber. We’ll check eligibility, explain realistic results and side effects, and give you a written plan and price.
Skin changes with fast fat loss
Significant, rapid weight loss reduces facial fat pads and can leave skin on the face, arms, abdomen and thighs looser — the widely reported “Ozempic face”. Younger skin with good elasticity rebounds better. Where it doesn’t, non-surgical options are commonly combined with a weight-loss programme:
- Skin tightening (HIFU or radiofrequency) for mild-to-moderate laxity
- Polynucleotide or profhilo-type skin boosters to improve skin quality and hydration
- Collagen-stimulating treatments for facial volume support
- Realistic advice on when skin laxity would only respond to surgery
What a medically supervised programme involves
- Full consultation: history, medications, measurements, blood pressure, and bloods where indicated.
- Confirmation of eligibility and a discussion of alternatives and expectations.
- Starting dose prescribed with injection-technique teaching.
- Scheduled reviews (typically every 4 weeks) to check tolerance, progress and to titrate.
- Nutrition and activity guidance focused on protein and resistance training.
- A maintenance and, eventually, a step-down or exit plan.
Why supervision matters
Buying GLP-1 medication without review risks the wrong dose, missed contraindications, unmanaged side effects, muscle loss and rapid regain on stopping. It is also increasingly a source of counterfeit product.
What it costs in London
| Component | Typical range |
|---|---|
| Medication (dose-dependent) | £120–£280 / month |
| Consultation & titration reviews | Often included; £50–£120 if separate |
| Bloods / monitoring as needed | £40–£120 occasionally |
| Typical all-in monthly cost | £150–£350 / month |
Cost usually falls once you reach a maintenance dose. Your quote is confirmed after assessment.
How Levirgo runs weight-loss treatment
- Doctor and prescriber-led assessment against UK eligibility criteria — no treatment without a proper review.
- Slow, comfortable titration with reviews every four weeks and a 24-hour contact for side effects.
- Built-in protein and resistance-training guidance to protect muscle.
- Optional pairing with skin-tightening or skin-booster treatments if fat loss affects skin.
- A written maintenance and step-down plan — not an open-ended prescription.
- CQC-registered clinic in Knightsbridge; transparent, itemised pricing.
Frequently asked questions
How much do weight-loss injections cost in Knightsbridge?
A medically supervised private programme typically costs £150–£350 a month all-in, covering the medication, titration reviews and any monitoring. The medication portion is dose-dependent and usually falls once you reach a maintenance dose.
How much weight will I lose?
Trial averages are around 10–12% of body weight over a year with semaglutide and 15–21% with tirzepatide. Individual results vary with the dose you tolerate, your nutrition and activity, and how consistently you take it.
Do I qualify?
Usually you need a BMI of 30 or above, or 27–29.9 with a weight-related condition such as type 2 diabetes, high blood pressure or sleep apnoea. A prescriber confirms suitability at consultation. They are not prescribed for cosmetic “last few pounds” weight loss.
What happens when I stop?
Appetite returns and, without established habit change, most people regain a large share of the weight within a year. That’s why programmes include resistance training, protein guidance and a maintenance or step-down plan rather than an abrupt stop.
What are the most common side effects?
Nausea, constipation or diarrhoea, reflux and early fullness — mostly in the first week or two after each dose increase. Slow titration, smaller lower-fat meals and hydration manage most of it. Rare but serious effects include pancreatitis and gallstones.
Will I lose muscle?
Some of any rapid weight loss is lean tissue — potentially 20–40% without intervention. Hitting a protein target and doing two to three resistance sessions a week substantially reduces muscle loss and protects your metabolism.
Will it affect my face or skin?
Fast fat loss can leave facial and body skin looser, the so-called “Ozempic face”. Younger, more elastic skin rebounds better. Where it doesn’t, skin-tightening or skin-booster treatments are often paired with the programme.
How is the dose increased?
You start low and move up in steps every few weeks, only when the current dose is comfortable. Reaching the maximum dose isn’t the goal — many people get excellent results below it.
Can I get these injections without a consultation?
Not legally in the UK. They are prescription-only and require a clinical assessment. Sellers offering them without a proper review are operating outside the rules and are a known source of counterfeit product.
Can I take them with other medications?
Often yes, but some medicines — particularly those needing precise timing or absorption, and insulin or sulfonylureas in diabetes — need dose adjustment because GLP-1 drugs slow stomach emptying. Bring a full list of your medications to the consultation.
Levirgo Aesthetics Clinic · Knightsbridge
A medically supervised path to lasting weight loss
Proper screening, slow titration, muscle-preserving guidance and honest maintenance planning — in Knightsbridge. No obligation to proceed.
Sources & further reading
This article is general information about GLP-1 weight-loss medicines and is not medical advice. These are prescription-only treatments; eligibility, benefits and risks can only be assessed in a personal consultation with a prescriber. Do not start, stop or change a prescribed medicine based on this article. Prices are indicative London ranges for 2026 and are confirmed in writing after assessment.