Weight Loss & Metabolic Health
What Medications Cause Weight Gain?
Last reviewed: May 2026 · Haute MD Editorial Team
Many widely prescribed medications can cause weight gain as a side effect — sometimes substantially. Recognizing medication-related weight gain is important because alternative drugs are often available, and dietary or activity changes alone rarely fully counteract the effect. Always discuss alternatives with the prescribing physician before stopping any medication.
Common categories that cause weight gain
Frequent culprits include certain antidepressants (paroxetine, mirtazapine), antipsychotics (olanzapine, quetiapine), mood stabilizers (lithium, valproate), corticosteroids (prednisone), some diabetes medications (insulin, sulfonylureas), beta-blockers, and hormonal contraceptives in some patients.
How these medications drive weight gain
Mechanisms vary: increased appetite (steroids, antipsychotics), altered metabolism (beta-blockers), fluid retention (steroids), changes in fat storage (insulin), and reduced energy/activity (some antidepressants).
What to do
Discuss weight-neutral or weight-loss-favoring alternatives with your physician. For example, bupropion is weight-neutral or weight-reducing among antidepressants; metformin and GLP-1s favor weight loss in diabetes care. Never stop prescribed medications without medical guidance.
Frequently Asked Questions
Which antidepressant is best for weight?
Bupropion is most weight-favorable; fluoxetine and sertraline are relatively neutral.
Do birth control pills cause weight gain?
Most evidence shows minimal impact; some women experience modest gain or water retention.
Can steroids be replaced?
Sometimes — discuss with your physician; alternatives exist for many conditions.
Does weight return after stopping the medication?
Often, but not always — addressing the gain promptly improves the chance of full recovery.
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