The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
Weight Loss On Citalopram — What You Need to Know
Citalopram is an SSRI antidepressant that can sometimes affect weight. If you're taking citalopram and concerned about weight gain or weight loss, you're not alone — many people experience weight changes with antidepressant medication. The good news is that if you need additional weight management support in the UK, prescription weight loss options are available for eligible adults. This guide explains how weight management works alongside antidepressant treatment, and what prescription options may be available to you.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
UK-Licensed Weight Loss Medications for Adults
If you're taking citalopram and want to explore prescription weight loss medication, the UK has three licensed options: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). These are GLP-1 and GIP/GLP-1 receptor agonist medications that may help with weight management uk through appetite regulation and reduced food cravings. Eligibility depends on your BMI and health profile: adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions, may qualify for prescription weight loss medication. Before starting any new medication alongside citalopram, you must inform your GP or prescriber about all medications you're currently taking. Drug interactions are carefully assessed during clinical evaluation. Use our free BMI calculator to check where your current weight falls, and discuss weight loss injections uk options with your healthcare provider.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private Weight Loss Treatment in the UK
NHS access: Weight loss medication through the NHS is available via specialist tier 3 weight management services, typically following a GP referral. Availability varies significantly by region, and waiting lists can be lengthy. Private access: Private prescription weight loss uk is available through GPhC-registered online pharmacies following an online clinical assessment — no NHS referral needed. Your GP can advise on NHS waiting times and may support either route. When discussing nhs weight loss options with your doctor, mention your citalopram use explicitly. Your prescriber will check for interactions and ensure any new weight loss medication is safe alongside your current antidepressant. Track your progress with our free progress tracker once you begin any new weight management approach.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
Can I take weight loss injections while on citalopram?
Potentially, yes — but this requires specific clinical assessment. Your prescriber will review all your medications, including citalopram, before prescribing any weight loss medication. Always inform any healthcare provider that you take citalopram. Some drug interactions are possible, so professional evaluation is essential. Never start new medication without informing your prescriber of existing treatments.
Does citalopram cause weight gain?
Citalopram can affect weight in different ways for different people. Some people experience weight gain, others experience weight loss or no change. Weight changes with SSRIs are linked to appetite changes, metabolism shifts, and sometimes fluid retention. If you're concerned about weight changes on citalopram, discuss this with your GP — they may adjust your dose or explore other options.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are prescription weight loss injections available in the UK. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist with average weight loss around 15–21% in clinical trials. Wegovy (semaglutide) is a GLP-1 agonist with average weight loss around 15%. Both are once-weekly injections. Your prescriber will assess which may be more suitable for your individual health profile.
How do I find out if I'm eligible for prescription weight loss treatment in the UK?
Check your BMI using our free BMI calculator on this page. If your BMI is 30 or above, or 27–29.9 with weight-related health conditions, you may be eligible. Contact your GP to discuss referral to specialist weight management services, or explore private options through GPhC-registered providers. A clinical assessment will confirm eligibility.
Will weight loss medication interact with my citalopram?
Possible interactions exist between some weight loss medications and citalopram, though they are not absolute contraindications. The prescriber assessing you will specifically review your citalopram dose and the proposed weight loss medication. This is why clinical assessment before prescription is essential. Never combine medications without professional review.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.