Medically Supervised Weight Loss That Works
Struggling with weight loss despite diet and exercise? You're not alone. Obesity and difficult-to-manage weight is a significant health challenge affecting millions. Traditional dieting often fails because our bodies actively resist weight loss through hormonal signals that drive hunger and appetite. This is where weight loss injections come in.
At Lambert Medical Practice in Surbiton, we offer a comprehensive, medically supervised weight loss injection programme using Mounjaro (tirzepatide) and Wegovy (semaglutide). These are safe, proven GLP-1 and GIP receptor agonists that work with your body's natural regulation of appetite and metabolism. Combined with our professional guidance on nutrition and lifestyle, these injections deliver real, sustained weight loss results.
What Are Weight Loss Injections?
Weight loss injections are medications that belong to a class called GLP-1 receptor agonists (and in the case of Mounjaro, also GIP receptor agonist). Originally developed to treat type 2 diabetes, these medications have been shown to produce significant weight loss in people with obesity.
How Do They Work?
- Appetite suppression: The medication signals your brain that you're fuller, reducing hunger and cravings.
- Slower stomach emptying: Food moves more slowly through your digestive system, keeping you feeling satisfied longer.
- Better blood sugar control: Improved glucose metabolism supports overall metabolic health.
- Reduced cravings: Many patients report decreased desire for sugary and fatty foods.
Mounjaro vs Wegovy
| Feature |
Mounjaro (Tirzepatide) |
Wegovy (Semaglutide) |
| Receptor targets |
GLP-1 and GIP agonist (dual action) |
GLP-1 agonist only |
| Average weight loss |
Up to 21% of body weight |
Up to 15% of body weight |
| Frequency |
Once weekly injection |
Once weekly injection |
| Cost |
Usually higher per injection |
Slightly lower than Mounjaro |
| Suitability |
Excellent for those seeking maximum weight loss |
Good option for moderate weight loss goals |
Am I Eligible for Weight Loss Injections?
Weight loss injections are prescribed based on medical criteria, not just a desire to lose a few pounds. Your GP will assess whether you're eligible based on:
BMI and Health Status
- BMI of 30 or above (generally considered obese), OR
- BMI of 27–29.9 (overweight) with weight-related health conditions such as:
- Type 2 diabetes
- High blood pressure (hypertension)
- Heart disease or high cholesterol
- Sleep apnoea
- Joint pain related to excess weight
- Fatty liver disease
Medical Suitability
You must be suitable for the medication. Your GP will check for contraindications such as:
- Personal or family history of medullary thyroid cancer or multiple endocrine neoplasia syndrome (MEN) — these are contraindications
- Severe kidney disease
- Pregnancy or breastfeeding (not suitable)
- Poorly controlled type 1 diabetes
What Does Our Weight Loss Injection Programme Include?
We believe in comprehensive, medically supervised weight loss. Our programme includes:
1. Initial Assessment (£65.98)
- Detailed medical history and review of weight loss attempts
- Assessment of weight-related health conditions
- Blood tests (liver and kidney function, blood glucose, cholesterol)
- Height, weight, and BMI measurement
- Discussion of realistic goals and expectations
- Screening for contraindications to the medication
2. Prescription Issued
Once approved, we issue your private prescription for Mounjaro or Wegovy. You take it to a pharmacy to collect the weekly injection pens. The cost of the medication itself varies (typically £150–250+ per month depending on dose).
3. Monthly Review Appointments (£65.98 each)
- Ongoing monitoring of weight loss progress
- Assessment of any side effects and advice on managing them
- Motivational support and encouragement
- Nutrition and lifestyle guidance
- Adjustment of doses as needed (gradual dose escalation is standard)
- Discussion of medication continuation, timing, and goals
4. Professional Guidance
- Evidence-based advice on nutrition and healthy eating
- Tips for managing side effects (nausea management, hydration)
- Lifestyle modifications (gentle activity, habit change)
- Support and motivation throughout your weight loss journey
What Results Can I Expect?
Results vary by individual, but clinical trials show impressive weight loss outcomes:
Semaglutide (Wegovy) Clinical Data
- Average weight loss of 10–15% of body weight over 68 weeks
- Some patients achieved up to 18% weight loss
- Approximately 70% of patients achieved at least 5% weight loss
- Improvements in blood glucose control and cardiovascular risk factors
Tirzepatide (Mounjaro) Clinical Data
- Average weight loss of 15–22% of body weight over 72 weeks
- Some patients achieved up to 24% weight loss
- Approximately 85% of patients achieved at least 5% weight loss
- Superior results compared to semaglutide in head-to-head trials
Timeline
- Weeks 1–2: Appetite suppression begins; nausea may occur
- Weeks 3–4: Noticeable appetite reduction; initial weight loss
- Months 2–3: Significant weight loss becomes apparent (5–10 lbs)
- Months 4–6: Continued steady weight loss; lifestyle benefits emerge
- Months 6–12: Cumulative weight loss plateaus at 10–21% depending on medication and compliance
Weight Loss Injection Programme Pricing
- Initial comprehensive assessment: £65.98 (includes full GP review, blood tests, and suitability screening)
- Monthly review appointments: £65.98 (includes progress monitoring, dose adjustment, and lifestyle guidance)
- Prescription cost: Varies by medication and pharmacy; typically £150–250+ per month
Note: GP consultation and review costs are separate from the medication cost. All prices are transparent with no hidden fees.
Why GP Supervision Matters
It's tempting to buy weight loss injections online without medical oversight, but medical supervision is crucial for safety and success:
Safety Screening
- Your GP checks for contraindications (e.g. personal/family history of certain cancers)
- Blood tests ensure your liver and kidneys can safely process the medication
- Assessment of drug interactions with any medications you're taking
Side Effect Management
- Nausea and vomiting are common early on; your GP provides practical management strategies
- Constipation can be managed with dietary and lifestyle adjustments
- Monitoring for rare but serious side effects
Optimised Outcomes
- Regular monitoring ensures you're on the right dose for your needs
- Professional guidance on nutrition and lifestyle maximises weight loss
- Motivation and support increase compliance and results
Frequently Asked Questions About Weight Loss Injections
Most patients begin feeling appetite suppression within the first week. Noticeable weight loss typically appears within 4 weeks, though some patients lose weight within the first 2 weeks. More significant results (5–10% of body weight) become apparent by 3 months. Maximum weight loss is usually achieved by 6–12 months of consistent treatment combined with healthy lifestyle changes.
Common side effects include nausea, vomiting, and constipation, particularly in the first few weeks. Most of these improve as your body adjusts. Loss of appetite is expected and desired. Serious side effects are rare when the medication is used appropriately under medical supervision. Your GP will discuss all potential side effects and provide management strategies during your reviews.
Yes, weight loss injections can be used long-term (12 months, 2 years, or longer) with ongoing medical supervision. Many people continue treatment to maintain their weight loss. However, regular review appointments with your GP are essential to ensure the medication remains appropriate and to monitor for any emerging health concerns.
Weight regain is common if lifestyle changes are not maintained after stopping the injections. The medication works by suppressing appetite and slowing stomach emptying, but these effects stop once treatment ends. Long-term weight maintenance requires continued commitment to healthy eating and regular activity. Discuss long-term strategies with your GP during your reviews.
NHS access to weight loss injections is very limited and varies significantly by region. Some areas offer these treatments only for patients with severe obesity or diabetes, but most require private funding. Private treatment at Lambert Medical Practice offers immediate access, comprehensive assessment, regular monitoring, and flexibility — without waiting lists or regional restrictions.