About Our Weight Management Doctors
  • Dr Siaw Tung Yeng
    Family Physician
    MBBS (NUS, Singapore) 1991, M Med (Family Med) (NUS, Singapore) 1996

    Siaw Tung Yeng has been a practising physician for more than 30 years and has been a senior consultant in family medicine since 2005.

    Dr Siaw is different from many doctors in one key respect. He has been complementing his work as a physician with IT for over 20 years. He worked with Singapore’s Ministry of Health implementing IT in the 1990s. He has also been a director at Gloco Malaysia, which provides health IT since 2006 and a director of United Vision Holdings, which operates seven family medicine clinics across Singapore for 15 years.

  • Dr Rachel Teoh Pui Pui
    Family Physician
    MBBS (Spore 2002), Postgraduate Diploma, DIP (Derm UK, 2007)

    Dr Rachel Teoh Pui Pui graduated with Bachelor of Medicine and Bachelor of Surgery from National University of Singapore in 2002. A surgeon by training, she is a member of National ATLS Committee and trainer for Advanced Trauma Life Support for American College of Surgeons Committee on Trauma in 2005. She now pursues her broader interest in Family Medicine with special interest in Dermatology and Public Health, with full accreditation from Aesthetic Dermatology Educational Group (ADEG) and American Academy of Aesthetic Medicine (AAAM). Dr Rachel Teoh served as frontline medical doctor in Tan Tock Seng Hospital during SARS in 2002 and COVID-19 in 2020.

    She is a Medical Doctor with strategic foresight for the future of healthcare. She is pioneer in Telemedicine in Singapore and co-founded MaNaDr in 2018 with a vision of equitable healthcare for all. In 2020, she led a group of medical doctors, working closely with Ministry of Health, to form the front line forward triage medical care to Migrant Workers residing in the dormitories during the peak of Covid-19 outbreak in the dormitories in 2020. She represented doctors on migrant worker-related health issues in our national pandemic response. Working closely with Migrant Workers' Centre, she spearheaded island-wide roll out of Tele-Monitoring devices to dormitories as part of the Chronic Care Management and Disease Surveillance.

  • Dr Siaw Seng Taat Nathan
    General Practitioner
    MBBS (NUS, Singapore) 2018

    Dr Siaw Seng Taat, Nathan graduated from the National University of Singapore with a Bachelor of Medicine and Bachelor of Surgery (MBBS). As an undergraduate, he participated in various Ophthalmology symposiums and conferences. One of his research papers was also chosen to be presented at the 32nd Asia-Pacific Academy of Ophthalmology Congress (APAO), where he presented his research findings on amblyopia, to the international community.

    Dr Nathan has also gained extensive experience across various institutions including Singapore National Eyecare Centre (SNEC), Changi General Hospital (CGH), Tan Tock Seng Hospital (TTSH) and National University Hospital (NUH). As a recognition of his contributions, he has also been awarded the Singapore Health Quality Service Awards in 2021.

    As a keen advocate for primary eye care, Dr Nathan currently works in the National University Hospital as well as maintains his research presence with Singapore National Eyecare Center and Singapore Eye Research Institute (SERI).

    Dr Nathan is fluent in both English and Mandarin. In his free time, Dr Nathan often volunteers both locally and abroad. He also spends time creating educational videos for the public, in hopes of achieving medical education in a fun and entertaining manner.

    Check out his Instagram here: Dr.Nate (@docnatesg) •(put hyperlink)

  • Dr Wong Choo Wai
    Senior Family Physician
    MBBS (NUS, Singapore) 1995

  • Dr Jeremiah Pereira
    Internal Medicine
    MBBS (S'pore) MRCP (UK) M.Med (Int Med)

    Dr. Pereira studied at the National University of Singapore on a SingHealth Undergraduate Medicine Scholarship and graduated with an MBBS in 2018. They subsequently completed their MRCP (UK) and M.Med (Int Med) in 2021. Prior to joining MaNaDr, they were part of the SingHealth Internal Medicine Programme. As part of their training, they rotated through and gained diverse experiences in various medical subspecialties. Their main areas of interest are in sexual health as well as gender-affirming care. Dr. Pereira strongly believes in providing inclusive and evidence-based care to their patients.

  • Dr Nam Min Fern Alvina
    Family Physician
    MBBS (NUS, Singapore) 1992, Dip OM (NUS, Singapore) 2000

    Dr Alvina Nam graduated from the National University of Singapore with a M.B.B.S degree. As part of the requirements after graduation, she worked in various departments in the government hospitals, including Accident and Emergency, General Surgery and Paediatrics. Subsequently, she left the Public Service and worked as a General Practitioner, first in the HDB heartlands and then the Orchard Road belt for about 10 years before finally setting up Clinic@Costa. During this time, Dr Nam had obtained several postgraduate diplomas, namely Post Graduate Diploma in Family Medicine (GDFM), Diploma in Occupational Medicine (D.O.M), Postgraduate Diploma in Palliative Medicine as well as Diploma in Aesthetic medicine.

About Our Weight Management Doctors
Our medical doctors are certified Family Physicians with the latest accreditation at the Basic Obesity Management Accreditation 2 (BOMA 2) Family Practice Skills Course conducted by the Singapore Association for the Study of Obesity (SASO) and College of Family Practitioners Singapore (CFPS) in 2022. You can directly seek consultation with our medical doctors for medical advice for weight-related issues you wish to seek help with.
Our Weight Loss Treatments
Experience the convenience and comfort of receiving medical advice, prescriptions, and ongoing support from a licensed doctor in the privacy of your own home.

An oral prescription medicine that acts as an appetite suppressant. It may also help with weight loss by increasing your resting energy.

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An injectable prescription medicine. Similar to Phentermine, it helps with weight loss by regulating your appetite through increased feelings of fullness and decreased feelings of hunger.

Refill Now

An oral, pharmacy-only medicine that breaks down fats in food. When taken with a meal, about one-third of the fat you consume does not get digested and is passed out in your stools.

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You're Not Alone!
There are 600 million overweight adults and 100 million overweight children worldwide. Its prevalence has doubled from 5.1% in 1992 to 10.8% in 2010. Whether you’re actively trying to lose weight, seeking assistance to maintain your progress, or looking for guidance before beginning a weight loss program, our doctors are here to support you every step of the way. Let us help you achieve your weight loss goals and live a healthier, happier life.
Weight issues affecting your confidence?
Speak with a doctor to determine if prescription weight loss medication is suitable for you

How to Consult a Weight Management Doctor Online?

Follow These Simple steps to Begin
Online doctor
  • 1

    Connect to Our Service

    Book a weight management teleconsultation through the “MaNaDr for Patient” App or our website.
  • 2

    Consult a MaNaDr Provider

    Consult with our trusted doctor and get the most effective treatment for you.

  • 3

    Receive Medication

    Receive your prescribed weight loss medication, if applicable. (4-hour medication delivery island-wide)
Our Lifestyle Diary Assists you in your Weight Management Journey
Our Lifestyle Diary Assists you in your Weight Management Journey
  • The Lifestyle Diary feature is designed to help you achieve your weight management goals.
  • With our user-friendly interface, you can easily track your progress, set personal weight goals, and access tools such as a BMI calculator to help you better understand your health status.
  • Whether you’re trying to maintain a healthy weight or reach a new weight goal, our app is the perfect companion to keep you on track and motivated.

Frequently Asked Questions about the Weight Management Program

  • 01

    What is Obesity?

    Obesity indicates abnormal physiology where there is a surplus intake of energy resulting in elevated body weight, the set point of which is now dysfunctional. A mismatch of 3% can lead to up to 1-2kg of weight gain per year. Our body weight is tightly regulated by a complex homeostasis where deviation from the set point triggers a compensatory response in the opposite direction trying to restore this set point. This compensatory response can persist for years further predisposing an individual to further weight regain beyond the initial weight loss.
  • 02

    How do Doctors Treat Obesity?

    During your consultation, a doctor will inquire about your diet and lifestyle to gain insight into your situation. Based on this information, the doctor will provide advice and support to help you achieve your weight loss goal. In addition to nutrition and a healthy lifestyle, the doctor may consider prescribing medications such as appetite suppressants or enzyme blockers to further enhance the effectiveness of your weight loss or weight management plan
  • 03

    What is the Main Goal of the Weight Treatment Journey?

    The main goal of weight treatment therapy is to treat and prevent weight-related complications. The optimal treatment will be based on individual risk and severity of weight-related complications such as Diabetes Mellitus, Osteoarthritis, Ischemic Heart Disease, Non-Alcoholic Fatty Liver Disease, and Obstructive Sleep Apnea.
  • 04

    How does Prescription Weight Loss Medication Support Me?


    Prescription weight loss medications can offer several benefits when used appropriately under the guidance of a healthcare professional. Some of the benefits include:

    • Prescription weight loss medications can help boost weight loss efforts by suppressing appetite, reducing cravings, or blocking the absorption of fat. These medications can assist individuals in achieving more weight loss compared to lifestyle changes alone.
    • Health Benefits: Losing weight can have numerous positive effects on overall health. By achieving weight loss goals with the assistance of medication, individuals may experience improvements in conditions related to obesity, such as high blood pressure, high cholesterol, and type 2 diabetes.
    • Personalized Approach: Prescription weight loss medications can be tailored to an individual's specific needs and circumstances. Healthcare professionals consider factors such as medical history, current medications, and individual goals to determine the most suitable medication option.
    It's crucial to consult with a healthcare professional to determine the appropriate medication and ensure its safe and effective use.

  • 05

    How much does our weight management program cost?


    The costs for online consultations may vary, starting from $13.10. The final payment amount can be influenced by different surcharges, which depend on various factors, including:

    • Timing of Consultation: The surcharge may fluctuate based on the time of day you schedule your consultation. Specifically, peak hours or late-night consultations may result in higher charges.
    • Weekends and Public Holidays: Consultations conducted on weekends or public holidays may incur an additional surcharge.
    • Provider Qualifications: Healthcare providers with more experience or higher qualifications may apply a higher surcharge to their services.
  • 06

    How long does it take to deliver my medication?


    Typically, meds will be delivered to your place within 4 hours.

    However, in certain scenarios, it may take more than 4 hours; refer to the delivery schedule below:

    • Medicine ordered 12 AM - 8 AM will be delivered on the same day between 10 AM to 2 PM.
    • Medicine ordered 12 am - 8 am will be delivered on the same day between 10 AM to 2 PM.
    • Medicine ordered between 8 AM - 8 PM will be delivered within 4 hours.

  • 07

    What do I need to prepare before a weight loss consultation?


    Ensure that you have a physical copy of your identity card with you ready for verification.

    Find a noise-free environment.

    Ensure that your microphone and camera are enabled and working properly. This is to ensure that you have a smooth online consultation.

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Take care of your weight to achieve your healthy living!