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Antidepressants, antipsychotics, insulin, beta-blockers, steroids and more can add real weight — and for most there is a weight-neutral alternative in the same class. Here is the honest list, and what actually helps.
| Drug class | Effect | Examples |
|---|---|---|
| Antidepressants (some) | Weight gain | paroxetine (Paxil), mirtazapine, amitriptyline; sertraline & citalopram more mildly |
| Antipsychotics | Weight gain | clozapine and olanzapine (most), risperidone, quetiapine, lithium |
| Insulin & sulfonylureas | Weight gain | insulin, glipizide, glyburide, pioglitazone (a TZD) |
| Beta-blockers | Weight gain | propranolol, metoprolol, atenolol |
| Seizure & nerve-pain drugs | Weight gain | valproate/divalproex, gabapentin, pregabalin, carbamazepine |
| Corticosteroids | Weight gain | prednisone, dexamethasone (especially longer courses) |
| Hormonal contraceptives | Roughly neutral | the pill, the shot (DMPA) |
| Metformin | Weight loss | metformin |
| Bupropion | Weight loss | Wellbutrin, and the Contrave combination |
| SGLT2 inhibitors | Weight loss | empagliflozin (Jardiance), dapagliflozin (Farxiga) |
| GLP-1 / GIP agonists | Weight loss | semaglutide (Wegovy), tirzepatide (Zepbound) |
The exception matters: bupropion (Wellbutrin) is the antidepressant that tends to be weight-neutral or mildly weight-reducing. If weight is the problem, that is the swap to ask about.
Among the largest medication-driven weight effects there is. Metformin and topiramate are the evidence-backed add-ons used to blunt it, rather than stopping a drug that is working.
A cruel loop in type 2 diabetes: the drug controls sugar but adds weight. This is exactly where GLP-1s and SGLT2 inhibitors changed the picture — they lower sugar and weight together.
A few pounds for many people, partly by lowering resting metabolism. Not all blood-pressure drugs do this — ACE inhibitors and ARBs are generally weight-neutral.
Notably, topiramate and zonisamide — also seizure drugs — go the other way and cause weight loss, which is why topiramate ended up in an FDA-approved weight-loss combination.
Drives appetite and fluid retention, and redistributes fat. Short courses matter less; the effect builds with dose and duration.
Genuinely overstated for most combined pills — good studies show little true effect. The injectable (Depo-Provera) is the one with more consistent weight-gain evidence.
Modest, real weight loss — a few pounds for many, not a weight-loss drug. Often the first thing tried, and used off-label to counter antipsychotic weight gain.
The weight-friendly antidepressant. Raises dopamine and norepinephrine, curbs appetite; paired with naltrexone in an FDA-approved weight drug.
Diabetes drugs that spill glucose into the urine — modest weight loss as a side benefit, and weight-neutral-to-negative unlike insulin.
The only medications where weight loss is the point, not a side effect — 15% and ~21% average in trials. If your other medications are driving weight, this is the class built to counter it.
Do not stop a prescription on your own. Several of these drugs are dangerous to stop abruptly (steroids, antidepressants, seizure medication), and most are treating something that matters more than a few pounds. The move is to take the specific drug and dose to your prescriber and ask about a weight-neutral alternative, a lower dose, or — if it has to stay — whether a GLP-1 fits.
Not typically — and if anything it tends slightly the other way. Spironolactone is a potassium-sparing diuretic, so it makes you shed water rather than retain it, which usually shows up as a small drop on the scale, not a rise. People often blame it for weight gain because the conditions it is prescribed for (PCOS, hormonal acne, heart failure) can themselves affect weight, but the drug itself is not a classic weight-gain medication. If the scale is moving on spironolactone, the cause is more likely the underlying condition than the pill.
Yes, modestly. Metformin produces a few pounds of weight loss for many people — real, but a fraction of what a GLP-1 does. It is not a weight-loss drug; it is a diabetes drug that happens not to add weight (unlike insulin or sulfonylureas) and nudges it down a little. It is also used off-label to blunt the weight gain from antipsychotics. If you are hoping metformin alone will drive significant weight loss, set expectations low.
Bupropion (Wellbutrin). It is the antidepressant that tends to be weight-neutral or mildly weight-reducing, where paroxetine and mirtazapine are among the most likely to add weight. If an antidepressant is driving weight gain, the honest move is not to stop it but to ask your prescriber whether a switch to bupropion — or an add-on — fits your situation. Never stop or swap a psychiatric medication on your own.
First, and this matters: do not stop it yourself. Many of these drugs are treating something serious, and abruptly stopping some (steroids, antidepressants, seizure drugs) is dangerous. What you can do is take the specific drug and dose to your prescriber and ask three questions: is there a weight-neutral alternative in the same class (there often is — bupropion for antidepressants, an ACE inhibitor for a beta-blocker, an SGLT2 or GLP-1 pathway in diabetes); can the dose come down; and if the medication has to stay, does a GLP-1 make sense to counter the weight it is adding. The weight gain is real and worth addressing — just not by quietly quitting a drug that is doing its job.