Mounjaro & Wegovy: a doctor's guide to weight-loss medications

What are Mounjaro and Wegovy?

Mounjaro (مونجارو — tirzepatide) and Wegovy (ويغوفي — semaglutide) are once-weekly injectable medications that treat obesity by acting on the gut hormones that control appetite and blood sugar. Wegovy mimics one hormone (GLP-1); Mounjaro mimics two (GLP-1 and GIP). They are prescription medicines that belong inside a medical program — not products to buy and self-inject.

How do these medications cause weight loss?

They act on the appetite centres of the brain and slow stomach emptying, so you feel satisfied with much smaller portions and think about food less. They also improve how the body handles sugar. In simple terms, they turn down the "hunger noise" that makes dieting so difficult.

How much weight can I expect to lose?

In large clinical trials, patients on semaglutide (Wegovy) lost around 15% of total body weight on average, and patients on tirzepatide (Mounjaro) lost around 20% — with lifestyle support, over roughly 16 months. Individual results vary considerably; some lose more, some less, and the medication dose is adjusted gradually.

Who is a good candidate for these medications?

Guidelines generally support them for people with a BMI of 30 or above, or 27 and above with a weight-related condition such as diabetes, hypertension or sleep apnea. They are also very useful for weight regain after bariatric surgery — an area where Professor Jamal was among the first worldwide to publish research on Mounjaro after sleeve gastrectomy.

What are the common side effects?

The most common are nausea, constipation or diarrhoea, bloating and reflux — usually mild and most noticeable when the dose increases. Starting low and increasing slowly, eating smaller meals and staying hydrated controls most of it. Serious side effects are uncommon; your doctor screens for conditions (such as a personal or family history of medullary thyroid cancer or pancreatitis) that make these medications unsuitable.

What happens when I stop the medication?

Appetite returns, and studies suggest much of the lost weight returns within a year if nothing else changes — because obesity is a chronic disease, not a temporary problem. This is why these medications work best inside a long-term plan that includes nutrition, muscle-preserving exercise, and a strategy for maintenance, which may mean continuing the medication.

Are these medications a replacement for surgery?

They are different tools for different situations. Surgery still produces larger, more durable weight loss for severe obesity, while medications suit lower BMI ranges, patients not ready for surgery, and weight regain after surgery. Professor Jamal published one of the region's first studies comparing tirzepatide with bariatric surgery — the honest answer is that the best choice depends on your case.

Will I lose muscle on these medications?

Any rapid weight loss includes some muscle unless you actively protect it. Adequate protein intake and resistance exercise two to three times a week preserve muscle and keep your metabolism healthy. A proper program monitors body composition, not just the number on the scale.

Why should these medications be supervised by a specialist?

Because dosing, side-effect management, screening, nutrition and the maintenance plan all determine whether the result lasts. Professor Jamal holds the American Board of Obesity Medicine — among the first cohort certified worldwide — and runs a dedicated obesity-medications clinic, including a separate clinic for adolescents where these medications are used in carefully selected cases.

How do I get started?

Book a consultation at Professor Jamal's obesity medications clinic, Kuwait Hospital, Sabah Al-Salem — WhatsApp +965 60621662 or phone +965 22207777 — or online from anywhere via the DAWI app.

This article is educational and does not replace personalized medical advice.