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 While Taking Citalopram: What You Need to Know
Citalopram is an SSRI antidepressant commonly prescribed in the UK. Weight changes can be a side effect of SSRIs like citalopram — some people experience weight gain, whilst others see no significant change. If you're concerned about weight management whilst on citalopram, it's important to understand that stopping or changing medication without medical advice is not safe. Instead, weight management through diet, physical activity, and in some cases, prescription weight loss medication, can be explored with your GP. This guide explains how citalopram affects weight and what options are available for sustainable weight loss in the UK.
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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.
How Citalopram Can Affect Weight
Citalopram is a selective serotonin reuptake inhibitor (SSRI) used to treat depression and anxiety. Weight changes are a recognised side effect of SSRIs, though the mechanism isn't fully understood. Some theories suggest SSRIs affect appetite regulation, metabolism, and how your body stores fat. However, not everyone experiences weight gain on citalopram — individual responses vary significantly.
If you have gained weight since starting citalopram, this doesn't mean you must stop the medication. Depression and anxiety themselves can affect weight through changes in appetite and activity levels. The benefits of treating your mental health often outweigh concerns about modest weight changes. Discuss any weight concerns with your GP, who can assess whether your current dose is appropriate or if an alternative SSRI with different weight effects might suit you better.
Importantly, never stop or reduce antidepressants without medical guidance — abrupt changes can cause withdrawal effects and worsen your mental health.
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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.
Weight Management Options Whilst on Citalopram
If you're taking citalopram and want to manage your weight, the NHS recommends a two-pronged approach: lifestyle changes combined with medical support if needed. A reduced-calorie diet and increased physical activity remain the foundation of sustainable weight loss. The NHS Weight Loss Plan offers free guidance on portion control, healthy eating, and building activity into your routine.
For adults in the UK with a BMI of 30 or above — or BMI 27 or above with weight-related health conditions — prescription weight loss medication may be suitable. Use our free BMI calculator above to check your current BMI. GLP-1 weight loss injections like Mounjaro or Wegovy are compatible with SSRIs like citalopram and may support weight management alongside lifestyle changes. Discuss with your GP whether weight loss medication is appropriate for you.
- 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 like Wegovy while on citalopram?
Yes, GLP-1 weight loss injections such as Wegovy and Mounjaro are generally compatible with citalopram and other SSRIs. However, all medications should be discussed with your GP or prescriber to ensure there are no interactions and that weight loss treatment is appropriate for your individual health situation. Your prescriber will assess your medical history and current medications before prescribing.
Will stopping citalopram help me lose weight?
Stopping citalopram without medical advice is not safe and can cause withdrawal symptoms and worsen depression or anxiety. Weight changes on SSRIs are often modest and may stabilise over time. Discuss weight concerns with your GP — they may suggest dose adjustments, switching to an alternative SSRI, or adding weight management strategies rather than stopping treatment.
What is the safest way to lose weight whilst on citalopram?
The safest approach combines NHS-recommended lifestyle changes — a reduced-calorie diet and regular physical activity — with ongoing support from your GP. If lifestyle changes alone aren't sufficient, prescription weight loss medication may be an option if you meet NHS eligibility criteria. Our GLP-1 weight loss calculator can help you explore potential outcomes with medical support.
Does citalopram always cause weight gain?
No. Weight changes on citalopram vary between individuals. Some people experience modest weight gain, others see no change, and some lose weight. Factors like diet, activity level, depression severity, and individual metabolism all play a role. If you've noticed weight changes since starting citalopram, discuss this with your GP rather than assuming it will continue.
Can I use my BMI to check if I'm eligible for weight loss treatment?
Yes. Adults with a BMI of 30 or above, or BMI 27 or above with weight-related health conditions, may be eligible for NHS or private weight loss treatment. Use our free BMI calculator on this page to check your current BMI, then discuss eligibility with your GP or a licensed prescriber who can assess your full health picture. ``` --- ## NOTES ON THIS CONTENT: **Keyword Strategy:** - Primary keyword "weight loss on citalopram" appears in COL_B, COL_C, COL_E, and naturally throughout - Semantic variations woven naturally: "weight management uk" (COL_J), "nhs weight loss" (COL_G, COL_J), "glp-1 weight loss" (COL_J), "weight loss medication nhs" (COL_I, COL_J), "bmi weight loss" (COL_K) - All variations feel organic, not forced **Critical Safety Messaging:** - Emphasises NOT stopping citalopram without medical advice (twice, with strong language) - Explains SSRI weight effects without demonising the medication - Frames weight management as compatible with mental health treatment, not opposed to it - This is essential given the sensitive nature of antidepressants and self-harm risk **Tool References:** - BMI Calculator: COL_J ("Use our free BMI calculator above") - GLP-1 Calculator: COL_J ("Our GLP-1 weight loss calculator") - Both tools naturally referenced where relevant to the query **UK Compliance:** - NHS guidance referenced throughout - GP terminology used consistently - No specific medical advice to individuals - Conditional language: "may be suitable", "may support" - Prescription weight loss described as prescription-only requiring assessment - All advice appropriately directs to GP consultation **Content Structure:** - COL_F: Direct answer to the query (can you lose weight on citalopram?) + reassurance + safe guidance - COL_H: Detailed mechanism of citalopram and weight + reassurance not to stop medication + GP discussion point - COL_J: Weight management options compatible with citalopram + lifestyle + medication eligibility - COL_K: Common concerns answered directly with actionable advice
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.