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Metformin for weight loss (Fortamet, Glumetza)

Metformin is a medication prescribed to treat type 2 diabetes by managing blood sugar levels.1 However, many people misuse metformin to lose weight, though it’s not approved for stand-alone weight loss treatment. Taking metformin as a diet pill or miracle weight loss drug can be harmful to your health, increase your risk of disordered eating, or indicate the presence of an active eating disorder.

 minute read
Last updated on 
June 12, 2024
Can you overdose on metformin?
In this article
Can you overdose on metformin? Although uncommon, metformin overdoses are possible and have occasionally resulted in death.2

What is metformin?

Metformin, which is sold under the brand names Fortamet, Glumetza, Glucophage, and Riomet, is a prescription medication approved by the Food and Drug Administration (FDA) to treat type 2 diabetes, although it has many off-label uses, including:3

  • Prevention of type 2 diabetes
  • Treatment and prevention of polycystic ovary syndrome (PCOS)
  • Gestational diabetes
  • Antipsychotic-induced weight gain

What are the risks of taking metformin?

Although metformin is a prescription medication for type 2 diabetes, people without this condition have begun taking it to lose weight. Misusing metformin for weight loss can be risky and cause dangerous consequences, especially since it isn’t approved for this purpose.6

Moreover, it could either indicate disordered eating practices or increase a person’s risk of engaging in disordered eating behaviors. That’s because misusing this drug to lose weight is connected to dieting, diet culture, fatphobia, internalized body ideals, and body dissatisfaction, all of which may influence an unhealthy relationship with food, eating, and movement.

If you or someone you know may be suffering from an eating disorder, discreet and effective treatment is available from the comfort of your own home.

Learn more

Metformin risks and side effects

Taking metformin can cause various side effects, including:1

  • Constipation
  • Gas
  • Stomach pain
  • Bloating
  • Diarrhea
  • Heartburn
  • Metallic taste in mouth
  • Muscle pain
  • Skin flushing
  • Headache

Serious metformin risks may include chest pain or a rash, which could indicate an allergic reaction.1 If you experience a dangerous adverse effect, call 911 or your doctor immediately. 

Can you overdose on metformin?

It is possible to overdose on metformin, although metformin overdoses tend to be relatively rare. That said, they can cause devastating consequences, including death.2

Metformin overdose symptoms may resemble hypoglycemia symptoms, such as:1

  • Nausea and vomiting
  • Severe fatigue or weakness
  • Rapid or slow heartbeat
  • Dizziness and lightheadedness
  • Shortness of breath
  • Rapid breathing
  • Feeling very cold

Severe metformin intoxication or an overdose can also cause severe lactic acidosis (or severe metabolic acidosis), which can cause a host of symptoms, such as:4

  • Severe abdominal pain
  • Nausea and vomiting
  • Low blood pressure
  • Rapid heart rate
  • Rapid breathing

Furthermore, overdosing on metformin can also impair kidney function due to poor blood flow.2

If you suspect someone has overdosed on metformin or has metformin poisoning, call 911 immediately. Stay on the line and answer all the operator’s questions to the best of your ability. Once they hang up, remain with the person until first responders arrive. 

The connection between metformin and eating disorders

Taking metformin for weight loss could be a sign of disordered eating or even a clinical eating disorder, such as anorexia, bulimia, or binge eating disorder, especially if you experience other eating disorder symptoms. Depending on the condition, these symptoms may include:5

  • Fasting
  • Severe food restriction
  • Cutting out entire food groups or food types
  • Distorted body image
  • Poor self-esteem
  • Self-inducing vomiting
  • Laxative misuse
  • Compulsive exercise
  • A pathological fear of gaining weight

In one case study, a woman with anorexia-binge purge type misused metformin, which she’d bought on the black market online. She used metformin as a form of purging behavior, which has rarely been reported but is extremely life-threatening.6

Another case study revealed that a woman with body dysmorphic disorder had been misusing high doses of metformin for three years, which led to a myriad of overdose symptoms and toxicity episodes, including kidney damage, heart issues, dangerously low sodium levels, low blood cell count, and more.7

Why metformin is misused

Misusing medications like metformin is popular because of the massive influence diet culture, healthism, and weight stigma have over our society.6 Diet culture, which is present virtually everywhere, has convinced us that there is an “ideal” body type we must achieve—and people often seek quick fixes or miracle weight loss drugs to help. 

Weight stigma and fatphobia are even present in healthcare, including diagnostic and treatment settings. Doctors may prescribe metformin for “pre-diabetes,” meaning someone is at risk for developing type 2 diabetes, based on their weight or BMI (which is outdated, an inaccurate predictor of health, and actively harmful). However, it may not be safe or beneficial to take this prescription medication when you aren’t actually at risk for type 2 diabetes. Understanding weight bias and the principles of Health at Every Size (HAES) can help prepare you for discriminatory physicians and potential metformin risks.

Getting help for an eating disorder

If you are taking medication like metformin or are engaging in disordered eating behaviors, professional treatment can help, especially from a treatment program that is inclusive and follows the HAES approach. Although in-person care in an inpatient or outpatient treatment setting can be helpful for many, more and more people are considering virtual care, given its flexibility and accessibility.

Effective treatment at home

At Within Health, we offer a comprehensive and individualized virtual eating disorder treatment program that can help you recover from conditions like binge eating disorder, anorexia, and bulimia from wherever you are most comfortable.

Get a free consultation

Disclaimer about "overeating": Within Health hesitatingly uses the word "overeating" because it is the term currently associated with this condition in society, however, we believe it inherently overlooks the various psychological aspects of this condition which are often interconnected with internalized diet culture, and a restrictive mindset about food. For the remainder of this piece, we will therefore be putting "overeating" in quotations to recognize that the diagnosis itself pathologizes behavior that is potentially hardwired and adaptive to a restrictive mindset.

Disclaimer about weight loss drugs: Within does not endorse the use of any weight loss drug or behavior and seeks to provide education on the insidious nature of diet culture. We understand the complex nature of disordered eating and eating disorders and strongly encourage anyone engaging in these behaviors to reach out for help as soon as possible. No statement should be taken as healthcare advice. All healthcare decisions should be made with your individual healthcare provider.


  1. Metformin. (2020). National Library of Medicine. Retrieved May 9, 2023. 
  2. Suchard, J. R., & Grotsky, T. A. (2008). Fatal metformin overdose presenting with progressive hyperglycemia. The Western Journal of Emergency Medicine, 9(3), 160–164.
  3. Corcoran, C., Jacobs, T. F. (2022). Metformin. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing. 
  4. Blough, B., Moreland, A., & Mora, A. (2015). Metformin-induced lactic acidosis with emphasis on the anion gap. Proceedings (Baylor University. Medical Center), 28(1), 31–33. 
  5. Eating Disorders. (2023). National Institute of Mental Health. Retrieved May 9, 2023. 
  6. Geer, B., Gibson, D., Grayeb, D., Benabe, J., Victory, S., Mehler, S., & Mehler, P. (2019). Metformin abuse: A novel and dangerous purging behavior in anorexia nervosa. The International Journal of Eating Disorders, 52(3), 319–321. 
  7. Hajsadeghi, S., Mesgarha, M., Mohammad, A., Shahrbabaki, A., & Talebi, A. (2022). A concealed history behind the disaster: Extremely rare presentations of metformin toxicity in a patient with body dysmorphic disorder. Toxicology Reports, 9, 848-851. 
  8. Lisdexamfetamine. (2021). National Library of Medicine.Retrieved May 9, 2023. 
  9. Dyatlova, N., Tobarran, N. V., Kannan, L, et al. (2023). Metformin-Associated Lactic Acidosis (MALA). In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing.


Is metformin used for weight loss?

Metformin is not typically prescribed for stand-alone weight loss, and if it is, it’s an off-label use, meaning metformin isn’t FDA-approved as a weight loss medication. However, it can be used to help people with type 2 diabetes lose weight.1

Is metformin safe?

If you have type 2 diabetes and are prescribed metformin, it is generally considered safe to take.1 However, if you misuse metformin as a diet pill or weight-loss drug, it can cause dangerous side effects and consequences.

What are the side effects of metformin?

Metformin affects everyone differently, but common side effects may include headache, flushing of the skin, muscle pain, heartburn, diarrhea, bloating, stomach pain, gas, and constipation.1 In some cases, metformin-associated lactic acidosis may also occur.9

Can you take metformin for binge eating?

Metformin is not FDA-approved to treat binge eating disorder nor is it commonly prescribed off-label. The only FDA-approved medication for binge eating disorder is Vyvanse.8

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Further reading

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