What BMI Qualifies for Prescription Weight Loss in Singapore?

The short answer: a BMI of 30 kg/m² or above, or a BMI of 27 kg/m² or above if you have at least one weight-related health condition such as Type 2 Diabetes, high blood pressure, or dyslipidaemia. These are the internationally recognised thresholds used by doctors in Singapore to determine whether prescription weight loss treatment is medically appropriate.

If you fall below these thresholds and have no obesity-related conditions, lifestyle changes — diet and exercise — remain the recommended first-line approach.

What Is BMI and Why Does It Matter?

Body Mass Index (BMI) is calculated by dividing your weight in kilograms by your height in metres squared (kg/m²). It is the primary screening tool used to classify weight status:

Singapore and most Asian countries use lower BMI cut-offs than Western guidelines, reflecting higher cardiometabolic risk at lower body weights in Asian populations. Under these locally applied criteria, obesity is defined from 27.5 kg/m² onwards.

It is worth noting that medication eligibility thresholds — derived from international prescribing criteria — use a slightly lower figure of 27 kg/m² when comorbidities are present. This means a patient with a BMI between 27.0 and 27.4 who has a condition such as hypertension or Type 2 Diabetes may still qualify for prescription treatment, even though they fall just below the local Asian obesity threshold. Your doctor will assess your individual risk profile to determine whether treatment is appropriate.

Who Qualifies for Prescription Weight Loss Treatment?

You are likely eligible if you meet either of the following criteria:

• BMI ≥ 30 kg/m² — regardless of whether you have other medical conditions
• BMI ≥ 27 kg/m² with at least one of the following: Type 2 Diabetes, hypertension, dyslipidaemia, obstructive sleep apnoea, or non-alcoholic fatty liver disease

You should also have made a reasonable attempt at lifestyle modification — diet changes and increased physical activity — without achieving sufficient weight loss.

Who Does Not Qualify?

Prescription weight loss treatment is generally not appropriate if you:

• Have a BMI below 27 kg/m² with no weight-related health conditions
• Are seeking weight loss for cosmetic reasons alone without medical indication
• Have specific contraindications, including a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 (relevant to GLP-1 medications)
• Are pregnant or planning to conceive in the near term

A doctor will assess your full medical history before prescribing.

What Medications Are Used?

The most commonly prescribed weight loss medications in Singapore are GLP-1 receptor agonists:

• Semaglutide — administered once weekly
• Liraglutide — administered once daily

Tirzepatide, a dual GLP-1/GIP receptor agonist is also available. All require a prescription and medical supervision.

Both work by suppressing appetite, slowing gastric emptying, and improving blood glucose regulation. They are most effective when combined with dietary changes and increased physical activity.

What Are the Risks and Limitations?

These medications are effective for many patients but come with important caveats:

• Common side effects: nausea, vomiting, diarrhoea, and constipation — most prominent when starting or increasing the dose, and usually improve over time
• Weight regain: the majority of patients regain a significant proportion of lost weight after stopping medication, meaning long-term or indefinite use may be necessary for sustained results
• Variable response: not all patients achieve clinically meaningful weight loss; a trial period is typically used to assess response
• Cost: GLP-1 medications are not subsidised under standard public healthcare pathways in Singapore and represent a significant ongoing expense (see below)

How Much Does It Cost in Singapore?

The fees for weight loss management would depend on the type of programme (exercise sessions/ health coaching) and the type of medication prescribed.

It may range from a $300 to $1400 per month.

What Happens at Your Appointment?

At an initial weight management consultation, your doctor will:

1. Record your height, weight, and calculate your BMI
2. Take a medical history and assess for obesity-related conditions
3. Review previous weight loss attempts
4. Screen for contraindications to medication
5. Discuss realistic treatment goals and expected outcomes
6. Initiate a prescription if criteria are met, or recommend lifestyle measures if they are not

Follow-up visits are typically scheduled every 4–8 weeks during the early phase of treatment to monitor response and manage side effects.

Frequently Asked Questions

Do I need to fast before starting treatment?

Fasting is not required to start the medication itself, but may be required if baseline blood tests (lipids, glucose, renal and liver function) are done.

How long does treatment last?

There is no fixed duration — this is typically a long-term treatment. Most patients use these medications for at least 12 months; many continue indefinitely given the risk of weight regain on stopping. Treatment duration is guided by individual goals, response, and ongoing medical review.

Can I stop the medication once I reach my target weight?

You can, but most patients experience weight regain after stopping. Your doctor will discuss a long-term maintenance plan with you.

Is prescription weight loss suitable for seniors?

It can be, depending on overall health status, kidney function, and existing medications. Older adults may need more careful dose titration and monitoring.

Are these medications the same as diabetes medications?

Semaglutide and liraglutide were originally developed for Type 2 Diabetes management. At higher doses, they are approved for weight management. Your doctor will clarify which indication and formulation applies to your situation.

If you are considering a weight loss or weight management solution, services are available at Minmed Clinics. Speak to our doctors to understand which option is suitable for you and your family.

🔗 Find out more about Minmed weight loss program

Medical Review & Authorship

This page is medically reviewed by:
Dr Yap Jun Jie Julian
MBBS, GDFM
Minmed Group Medical Doctor

The information provided is for general educational purposes and does not replace an individual medical consultation.

Last updated: September 2026