How much weight do people gain on Paxil?

There is no single number. For those who gain, references describe it as more likely than with other SSRIs and often a few to several pounds over months, with a wide range. Some gain more over long-term use; others change little. Track your own trend.

Why does Paxil cause more weight gain than other SSRIs?

Paroxetine appears to increase appetite for more people and has properties some references link to its higher weight-gain profile within the SSRI class. The return of a normal appetite as mood improves can add to the effect.

Is there an antidepressant like Paxil that doesn't cause weight gain?

Several antidepressants are more weight-neutral, including bupropion and some other SSRIs. The best alternative depends on your symptoms and history, so discuss options with your prescriber rather than switching on your own.

Will the weight come off if I stop Paxil?

It varies, and you should not stop on your own. Paroxetine has notable discontinuation symptoms. If weight is a concern, talk to your prescriber about a supervised plan or alternative instead of stopping abruptly.

Does Paxil Cause Weight Gain?

By Mustafa Bilgic · Updated June 2026 · Reviewed against drug information from MedlinePlus (NIH), Mayo Clinic, the FDA-approved label, and Drugs.com.

Educational information, not medical advice. This page summarizes what drug references say in general terms. It is not a substitute for advice from your doctor or pharmacist, and not a recommendation to start, stop, or change any medication. Do not stop Paxil on your own — it has notable discontinuation symptoms, and stopping abruptly can cause withdrawal and a return of symptoms. Operator: Mustafa Bilgic.

Paxil (generic paroxetine) is a selective serotonin reuptake inhibitor (SSRI) used for depression and anxiety disorders. Among the SSRIs, Paxil stands out: it is the one references most consistently single out as most likely to cause weight gain. So the answer here is closer to "yes, more than other SSRIs" — though it still isn't guaranteed and remains manageable. Here is what the references say.

The short answer

Yes — of the SSRIs, Paxil (paroxetine) is the one most often associated with weight gain. Mayo Clinic and drug references repeatedly name paroxetine as the SSRI most linked to weight gain, especially with longer-term use. It still isn't certain — many people don't gain meaningfully — but the risk is higher than with most other SSRIs. MedlinePlus advises telling your doctor about unusual weight change.

Key point: If avoiding weight gain is a high priority for you, paroxetine is the SSRI references flag most often. That is worth discussing with your prescriber, since several other antidepressants are more weight-neutral and may treat your symptoms just as well.

What the evidence shows

Paroxetine's prescribing information lists weight gain and increased appetite among possible side effects, and the broader research literature and Mayo Clinic specifically identify paroxetine as the SSRI most associated with weight gain — more so than sertraline, citalopram, or fluoxetine, which is more often linked to early weight loss. The effect tends to emerge over longer-term treatment and varies considerably between people.

How much weight are we talking about?

For those who do gain on paroxetine, references describe it as more likely and sometimes a bit more than with other SSRIs — commonly a few to several pounds over months, with a wide individual range. Some people gain more over long-term use, while others see little change. As always, your own tracked trend matters more than any average number.

Why it tends to happen

Appetite changes. Paroxetine appears to increase appetite for more people than other SSRIs, which can raise intake.
Mild anticholinergic and other effects. Paroxetine has properties some references link to its higher weight-gain profile within the SSRI class.
Appetite recovery. As depression or anxiety eases, a suppressed appetite returns — a recovery effect common to antidepressants.
Lifestyle shifts. Changes in energy, activity, and routine during treatment can affect weight too.

Timeline: when weight tends to change

Any weight gain on paroxetine tends to be gradual and more associated with longer-term use rather than the first few weeks. Because individual responses differ widely, the most reliable approach is to weigh under similar conditions and watch the trend over a month or two rather than reacting to daily fluctuations.

What you can do if you're concerned

Track the trend, not the day. Weigh under consistent conditions and look at the multi-week pattern.
Mind appetite changes. If hunger rises, plan balanced meals and watch calorie-dense snacking.
Stay active. Regular movement supports weight stability and mood.
Tell your prescriber. If weight is a priority, ask about more weight-neutral options.
Never stop on your own. Paroxetine has notable discontinuation symptoms; any change should be supervised.

If your goal is intentional, healthy weight management, our calorie calculator can help you understand your numbers — coordinate any plan with your clinician.

How Paxil compares to other antidepressants

Within the SSRI class, paroxetine is the standout for weight gain, while fluoxetine (Prozac) is more often linked to modest early weight loss, and sertraline and citalopram sit in between. Across classes, bupropion (Wellbutrin) is more weight-neutral, while tricyclics like amitriptyline are more linked to gain. See the antidepressants overview and our weight-neutral options page.

Mustafa Bilgic

Operator of WeightGain.us, based in Adıyaman, Türkiye. Mustafa is an independent publisher, not a medical professional; every clinical statement here is attributed to the cited authorities (MedlinePlus/NIH, Mayo Clinic, the FDA label, Drugs.com). For personal advice about Paxil, consult your own doctor or pharmacist.

Important: Do not stop or change your dose of Paxil based on this article. Paroxetine is known for discontinuation symptoms, and stopping suddenly can cause dizziness, irritability, flu-like feelings, and a relapse of depression or anxiety. Any change should be supervised by your prescriber.

When to call your doctor

Contact your doctor or pharmacist for rapid or significant weight change, changes that bother you, or any new or worsening symptoms. Seek urgent help for serious side effects described in the label or any thoughts of self-harm, which require immediate medical attention.

Frequently asked questions

Does Paxil cause weight gain?: More than other SSRIs, yes. Mayo Clinic and drug references name paroxetine (Paxil) as the SSRI most associated with weight gain, especially over longer-term use. It still isn't guaranteed, but the risk is higher than for most other SSRIs.
How much weight do people gain on Paxil?: There is no single number. For those who gain, references describe it as more likely than with other SSRIs and often a few to several pounds over months, with a wide range. Some gain more over long-term use; others change little. Track your own trend.
Why does Paxil cause more weight gain than other SSRIs?: Paroxetine appears to increase appetite for more people and has properties some references link to its higher weight-gain profile within the SSRI class. The return of a normal appetite as mood improves can add to the effect.
Is there an antidepressant like Paxil that doesn't cause weight gain?: Several antidepressants are more weight-neutral, including bupropion and some other SSRIs. The best alternative depends on your symptoms and history, so discuss options with your prescriber rather than switching on your own.
Will the weight come off if I stop Paxil?: It varies, and you should not stop on your own. Paroxetine has notable discontinuation symptoms. If weight is a concern, talk to your prescriber about a supervised plan or alternative instead of stopping abruptly.

Related guides

References

Sources: MedlinePlus (NIH) — Paroxetine · Mayo Clinic — Antidepressants and weight gain · Drugs.com — Paxil · U.S. FDA — Drugs · NIMH — Depression.