Can You Mix Weight Loss Drugs and Alcohol?
Obesity or weight loss drugs may be prescribed in the short-term or the longer-term in addition to diet and exercise to treat weight gain. But even if you are losing weight with medications, you might still want to have a beer, a glass of wine or a cocktail every once in a while. So the question is - do weight loss drugs have interactions with alcohol?
The short answer is - it depends. Many weight loss drugs can interact with alcohol, but a few don't. That's why you should check for alcohol drug interactions with your healthcare provider.
Weight loss medications, such as the amphetamine derivatives like phentermine work in the brain (also known as the central nervous system or CNS). Adding alcohol to weight loss medications can lead to side effects with both drugs.
The effects of adding alcohol to certain weight loss medications can include:
- dizziness
- mental depression
- problems with concentration, judgement or thinking
- drowsiness, sedation or altered mental alertness which can make driving or other hazardous activities dangerous
- serious heart side effects
- seizures
- liver toxicity
- changes in blood sugar levels
Heart disease
The use of CNS stimulant weight loss drugs should be avoided with the use of alcohol, especially in patients with heart disease. When these amphetamine-like drugs are combined with alcohol, dangerous cardiovascular (heart) side effects such as rapid heart rate, chest pain, and blood pressure changes can occur.
Many weight loss or obesity drugs are also controlled substances, have addictive potential and can be misused.
Diabetes
Alcohol may affect blood glucose (blood sugar) levels in patients with diabetes. In general, moderate alcohol consumption generally does not affect blood sugar levels if your diabetes is under control. You should avoid using alcohol if your diabetes is not well controlled.
However, both hypoglycemia (low blood sugar) and hyperglycemia (high blood sugar) may occur, based on how much you drink and how often. Avoid drinking alcohol on an empty stomach or following exercise, as it may increase the risk of hypoglycemia.
Many diabetes medications may lead to hypoglycemia as well, so it's best to ask your doctor about drinking alcohol if you have diabetes.
Seizure risk
Drinking alcohol during treatment with bupropion and naltrexone (Contrave) should be minimized or avoided altogether due to reports of adverse nervous system and liver side effects. Contrave should not be used in patients undergoing an abrupt discontinuation of alcohol. Combining alcohol with bupropion or abruptly stopping alcohol use can increase the risk of a seizure.
If you frequently or excessively consume alcohol, discuss this with your doctor before starting treatment with bupropion and naltrexone (Contrave).
Liver toxicity
Liver toxicity may be increased if you combine alcohol with naltrexone (a component of Contrave). Signs of liver toxicity can include fever, chills, skin rash, nausea, unusual bleeding or bruising, dark-colored urine, pale (clay-colored) stools, yellowing of the skin or eyes, or stomach-area pain.
Learn More: Guide to Weight Loss Drugs
Table 1: Common Weight Loss Drugs
Generic Name | Common Brand Names | Drug Class / Schedule |
---|---|---|
amphetamine | Evekeo, Evekeo ODT | CNS Stimulant, CII |
benzphetamine | brands discontinued | CNS Stimulant, CIII |
bupropion and naltrexone | Contrave | Anorexiant |
diethylpropion | brands discontinued | CNS Stimulant, CIV |
liraglutide | Saxenda | GLP-1 Agonist |
orlistat | alli, Xenical | Peripherally-acting antiobesity agent |
phendimetrazine | Bontril PDM | CNS Stimulant, CIII |
phentermine | Adipex-P, Lomaira | CNS Stimulant, CIV |
phentermine and topiramate | Qsymia | CNS stimulant, anorexiant, CIV |
semaglutide | Wegovy | GLP-1 Agonist |
tirzepatide | Zepbound | GIP / GLP-1 Agonist |
*This is not a complete list; always check with your doctor or pharmacist for drug interactions.
Do all weight loss drugs interact with alcohol?
No, not all weight loss drugs have drug interactions with alcohol. For example, orlistat (alli, Xenical) does not list alcohol drug interactions in their product labeling. alli is a weight-loss agent available over-the-counter, while Xenical is the prescription strength version.
Wegovy and Zepbound do not list alcohol as a potential drug-drug interaction in the labeling, but if you have type 2 diabetes, the use of alcohol might further increase your risk for low blood sugar.
Always check for drug interactions with your pharmacist or doctor to determine if it's safe to combine alcohol with any medicine.
Related: drugclasses.com Drug Interaction Checker
Types of Drug Interactions With Alcohol
- ADHD Medications and Alcohol
- Allergies, Cough/Cold Medications and Alcohol
- Antibiotic Medications and Alcohol
- Antidepressants and Alcohol Interactions
- Antipsychotic Medications and Alcohol
- Anxiety Medications and Alcohol
- Bipolar Medications and Alcohol
- Birth Control Pills and Alcohol
- Blood Thinners and Alcohol: A Dangerous Mix?
- Caffeine, Energy Drinks and Alcohol: A Wise Choice?
- Can You Mix Alcohol with Stomach Medicines?
- Cholesterol Medications and Alcohol: Can You Mix Them?
- Diabetes Medications and Alcohol
- Do blood pressure drugs interact with alcohol?
- Do Erectile Dysfunction (ED) Drugs Interact with Alcohol?
- Enlarged Prostate (BPH) Medications and Alcohol Interactions
- Herbal Supplements and Alcohol
- Illicit Drugs and Alcohol: Should You Mix Them?
- Is it safe to drink alcohol with acne medicines?
- Motion Sickness Drugs and Alcohol Interactions
- Seizure Medicines and Alcohol: Do They Mix?
- Should you mix muscle relaxants with alcohol?
- What are the dangers of mixing sleeping pills with alcohol?
- What are the risks of mixing pain medications and alcohol?
Learn more
- FDA-Approved Weight Loss Drugs: Can They Help You?
- How to Calculate Your Body Mass Index (BMI)
- Side Effects of Weight Loss Drugs
- Surgery for Weight Loss: What Are Your Options?
- U.S. Childhood Obesity Epidemic: Treatment and Prevention
- Weight Loss Drugs: What Are Your Options?
- Which Drugs Cause Weight Gain?
Treatment options
- Medications for Unintentional Weight Loss (Underweight)
- Medications for Weight Loss (Obesity/Overweight)
Care guides
Sources
- Prescription Medications to Treat Overweight and Obesity. National Institutes of Health. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Last Reviewed March 2023. Accessed Oct 27, 2023 at https://www.niddk.nih.gov/health-information/weight-management/prescription-medications-treat-overweight-obesity
- Product Information. Contrave (bupropion and naltrexone). DailyMed. Accessed Oct 27, 2023 at https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=485ff360-32c8-11df-928b-0002a5d5c51b
- Mendelson J, Jones RT, Upton R, Jacob P. Methamphetamine and ethanol interactions in humans. Clin Pharmacol Ther 57 (1995): 559-68. Accessed Oct 27, 2023 doi: 10.1016/0009-9236(95)90041-1
- Product Information. Adipex-P (phentermine). Teva Pharmaceuticals, Sellersville, PA. Updated September 30, 2020. Accessed Oct 27, 2023. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=f5b2f9d8-2226-476e-9caf-9d41e6891c46
- Wegovy (semaglutide) product label. Novo Nordisk. Plainsboro, NJ. Revised: 07/2023. Accessed Oct 27, 2023 at https://www.novo-pi.com/wegovy.pdf
- Zepbound (tirzepatide) product label. Eli Lilly and Co. Indianapolis, IN. Revised 11/2023. Accessed Nov. 15, 2023 at https://uspl.lilly.com/zepbound/zepbound.html#pi
Further information
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.