Antidepressants and weight
What antidepressants tend to do to weight, which ones differ, and how to think about it.
The honest picture
In the short term, most antidepressants are roughly weight-neutral. Over the longer term, some are associated with modest weight gain for some people.
The amount is usually modest, and it is highly individual. Two people on the same medication can have different experiences. Depression itself also affects appetite and weight, in both directions, which makes the picture harder to read. A change on the scale may reflect the medication, the illness improving, or ordinary life, and untangling that takes a clear-eyed look over time.
Which medications differ
Some medications are more associated with weight gain. Mirtazapine is one, because it directly increases appetite. Paroxetine is another, and it is more linked to weight gain than other SSRIs. Some other SSRIs and SNRIs can also be associated with modest gain for some people over the longer term.
Most SSRIs and SNRIs are roughly weight-neutral in the short term. Bupropion tends to be weight-neutral or linked with mild weight loss. That is one reason it is sometimes chosen when weight is a concern.
Why it happens
Why antidepressants affect weight is not fully understood. It can involve changes in appetite, in how the body handles food, and in activity levels as mood changes.
For mirtazapine, the increase in appetite is a direct effect of the medication. For other medications the picture is less clear and likely involves a mix of factors. This is part of why the effect is so individual.
What you can do
Do not stop a medication on your own because of weight. Raise it with a prescriber instead.
If weight is a concern, the choice of medication can take that into account, either at the start or as a change later. It also helps to watch the trend over time rather than week to week, since weight fluctuates day to day. Attending to diet and activity makes a difference. And it is worth weighing any change against how well the medication is helping, because the value of feeling better is part of the same decision.
Sources
This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes.
- National Institute of Mental Health. Mental health medications.
- MedlinePlus, U.S. National Library of Medicine.
- American Psychiatric Association. Practice guideline for the treatment of patients with major depressive disorder.
Managing a medication needs a prescriber
Any psychiatric medication has to be started and adjusted by a clinician who can follow you over time. If you don't have a prescriber, our guides section explains the options, including in-person care and telepsychiatry, and how to choose between them.
This guide is for general education. It is not medical advice and is not a substitute for evaluation, diagnosis, or treatment by a qualified clinician. Never start, stop, or change a medication without talking to your prescriber. If you are in crisis or thinking about harming yourself, call or text 988 in the U.S. to reach the Suicide and Crisis Lifeline.