Short answer: for most people, Celexa (citalopram) causes little or no weight gain in the first couple of months. In its original placebo-controlled trials, people taking it actually lost about half a kilogram on average. The bigger question is the long haul. Large health-record studies suggest a modest drift upward over one to two years, usually a few pounds, and a smaller group of people gain more than that. So the honest answer on celexa weight gain is “sometimes, usually slowly, and often less than people fear.”
Key takeaway: Citalopram is not one of the antidepressants most linked to weight gain (that title belongs to mirtazapine). But it isn’t weight-neutral over the long term either. Average changes are small; individual changes vary a lot.
This post sets the research out as an evidence ledger, split by time: what happens in the first weeks, what happens by six to twelve months, and what happens after two years or more. After that, you’ll find a comparison of common antidepressants, five plain reasons the scale moves, a 12-week plan for keeping your weight steady, and clear signs it’s time to talk to your prescriber. For a broader look at everything else this medicine can do, see our guide to Celexa side effects.
Celexa weight gain at a glance: the evidence ledger
Think of this like a household budget, with entries recorded at different points in time. Each column draws on a different kind of research, and each kind has its own strengths and blind spots. Short clinical trials are tightly controlled but brief. Long health-record studies follow huge numbers of real patients but can’t fully separate the drug’s effect from everything else going on in people’s lives.
| Time frame | Main evidence | What it found for citalopram | How much to trust it |
|---|---|---|---|
| Short term (first weeks) | Placebo-controlled trials in the FDA-approved Celexa label | Average weight loss of about 0.5 kg vs. no change on placebo; both “weight decreased” and “weight increased” listed as frequent events | High for the short window; says nothing about later months |
| Medium term (6-12 months) | Blumenthal et al., JAMA Psychiatry 2014 (about 19,000 patients); Petimar et al., Annals of Internal Medicine 2024 (183,118 patients) | Average gain of roughly 1-2 lb at 12 months; at 6 months, about 0.12 kg more than sertraline | Moderate; real-world data, but observational |
| Long term (2+ years) | Arterburn et al., J Clin Med 2016; Gafoor et al., BMJ 2018 (UK cohort of about 295,000 people) | Antidepressants as a group raised the risk of 5%+ weight gain; risk peaked in years 2-3 | Moderate; large and long, but can’t prove cause |
Now let’s open each column.
Column 1 — short term: what the Celexa label shows
The official Celexa prescribing information is the most tightly controlled evidence we have. In its controlled trials, people on citalopram lost an average of about 0.5 kg (a little over one pound), while people on placebo saw no change. That’s a small number, and it points in the opposite direction from what many people expect.
A few other label details help explain that early dip:
- Anorexia (loss of appetite) was reported in 4% of people on Celexa vs. 2% on placebo. Nausea in the early weeks can blunt appetite too.
- Both “decreased weight” and “increased weight” appear in the label’s list of frequent metabolic events. In other words, some people moved in each direction.
- Increased appetite is also listed as a frequent event, which hints at the minority who go the other way.
- Somnolence (drowsiness) affected 18% vs. 10% on placebo, and fatigue 5% vs. 3%. Tiredness matters for weight later on, because it quietly cuts daily movement.
The limitation is time. These trials ran for weeks, not years. They tell you that citalopram doesn’t typically pile on weight at the start. They can’t tell you what happens in month nine.
It’s also worth knowing that the first weeks are when the medicine is still settling in. Mood benefits usually take several weeks to build (our post on how long Celexa takes to work covers the typical timeline). That matters for weight, because appetite often changes as mood changes. More on that below.
Column 2 — medium term: 6 to 12 months
Once you move past the trial window, the data come from electronic health records: weights recorded at ordinary doctor visits for thousands of patients. Two studies stand out.
Blumenthal et al., JAMA Psychiatry, 2014
Researchers at Massachusetts General Hospital looked at health records for roughly 19,000 adults aged 18 to 65 who were prescribed an antidepressant, checking weight every three months for a year. Interestingly, they used citalopram as the reference drug, the yardstick everything else was measured against.
What they found, as summarized by Harvard Health Publishing: people on citalopram gained about one to two pounds over the year on average. Bupropion (Wellbutrin), amitriptyline and nortriptyline were linked to less gain than citalopram, with bupropion close to none. Most other antidepressants landed in a similar range to citalopram. The researchers described the differences between drugs as modest, and some patients lost a few pounds.
One more detail from MDedge’s report on the study: the gaps between drugs were weaker in people who stopped their medicine before the full 12 months. That fits the idea that any weight effect builds slowly with continued use.
Petimar et al., Annals of Internal Medicine, 2024
This much larger study followed 183,118 adults who started one of eight common antidepressants, using sertraline (Zoloft) as the reference. At six months, sertraline users had gained about half a pound on average. Compared with that, citalopram users gained about 0.12 kg more, a tiny difference. Escitalopram, paroxetine and duloxetine were linked to slightly more gain, and bupropion to slightly less. Harvard Health’s write-up notes that citalopram’s odds of weight gain didn’t differ meaningfully from sertraline’s.
If you’re deciding between those two, our Celexa vs. Zoloft comparison covers the other differences that usually matter more than a fraction of a kilogram.
Ledger entry, medium term: a small average gain, roughly in the middle of the SSRI pack.
Column 3 — long term: two years and beyond
This is where most worries about Celexa weight gain live, and where the evidence is thinnest for citalopram specifically.
Arterburn et al., 2016
Kaiser Permanente Washington researchers followed adults with depression for two years after starting a second-generation antidepressant, with fluoxetine (Prozac) as the yardstick. (This paper appeared in the Journal of Clinical Medicine, not the International Journal of Obesity as it is sometimes cited.) According to the NIH summary of the study, non-smokers on bupropion weighed about 7.1 pounds less than non-smokers on fluoxetine, who gained about 4.6 pounds on average. Sertraline users gained about 6 pounds more than fluoxetine users. Citalopram didn’t stand out from fluoxetine in a meaningful way.
Gafoor et al., BMJ, 2018
The biggest long-term picture comes from the UK. This BMJ cohort study used general practice records from 2004 to 2014 for nearly 295,000 adults. Among antidepressant users, new episodes of gaining at least 5% of body weight occurred at 11.2 per 100 person-years, compared with 8.1 in non-users. That’s about a 21% higher rate after adjustment.
Three findings matter for anyone on long-term citalopram:
- Timing: the extra risk peaked in the second and third years of treatment and faded after that.
- Scale: in the second year, about 27 people had to be treated for one year to produce one extra episode of 5%+ weight gain. Most people did not have that outcome.
- Drug differences: mirtazapine carried the highest risk of any antidepressant in the study. The headline finding, though, applied to antidepressants as a group, so it’s best read as a general caution for long-term users, including people on citalopram.
The authors were careful to say these links may not be fully causal. People who need antidepressants differ from people who don’t in sleep, stress, activity and other medicines, and that can’t be fully adjusted away.
Ledger entry, long term: a real but modest rise in the chance of meaningful weight gain, concentrated in years two and three. Worth watching, not worth panicking over.
Celexa weight gain vs. other antidepressants
No ranking is perfect, because studies use different reference drugs and follow-up times. But the overall pattern across the research is fairly consistent. A large 2010 meta-analysis in the Journal of Clinical Psychiatry found amitriptyline, mirtazapine and paroxetine linked to greater weight gain, with bupropion and (briefly) fluoxetine linked to some loss.
| Medicine | Typical weight pattern | Notes from the research |
|---|---|---|
| Bupropion (Wellbutrin) | Neutral to slight loss | Lowest gain in Blumenthal 2014, Arterburn 2016 and Petimar 2024 |
| Fluoxetine (Prozac) | Early slight loss, later neutral to mild gain | Early loss appears limited to the first phase of treatment |
| Sertraline (Zoloft) | Mild gain | Reference drug in Petimar 2024 (about 0.5 lb at 6 months) |
| Citalopram (Celexa) | Early slight loss, then mild gain | About 0.5 kg loss in trials; roughly 1-2 lb gain at 12 months in Blumenthal 2014 |
| Escitalopram (Lexapro) | Mild gain | About 0.41 kg more than sertraline at 6 months in Petimar 2024 |
| Paroxetine (Paxil) | Mild to moderate gain | Linked to more gain in the 2010 meta-analysis and Petimar 2024 |
| Duloxetine (Cymbalta) | Mild gain | About 0.34 kg more than sertraline at 6 months |
| Mirtazapine (Remeron) | Most likely to cause gain | In US label trials, 7.5% gained at least 7% of body weight vs. 0% on placebo; increased appetite in 17% |
Escitalopram is a close chemical cousin of citalopram, so people often ask whether switching between them changes weight. The data show only small differences; see Celexa vs. Lexapro for how the two compare on dosing, heart rhythm and side effects. And if you’ve wondered why some medicines push weight the other way, our post on whether Adderall causes weight loss explains how stimulants suppress appetite, a very different mechanism from antidepressants.
Five reasons the scale moves on citalopram
When someone notices Celexa weight gain, the drug is rarely the only story. Here are the five most common contributors, roughly in order of how often they show up.
1. Your appetite is coming back
Depression often flattens appetite. Food tastes like nothing, meals get skipped, and weight drops. When treatment starts working, hunger and enjoyment of food return. Some of the weight people “gain on Celexa” is really weight they lost while unwell. That’s recovery, not a side effect, though it can still overshoot.
2. Carbohydrate cravings
Some people notice they want more sweets, bread and snacks on an SSRI. Serotonin plays a part in appetite and fullness signals, and the label lists increased appetite as a frequent event. Cravings tend to be strongest in the evening and when tired.
3. Fatigue and less movement
Drowsiness was nearly twice as common on Celexa as on placebo in trials. Feeling sluggish adds up: fewer steps, more sitting, less energy for cooking. Sleep problems feed the same loop. Short or broken sleep raises hunger hormones the next day, and some people sleep poorly on citalopram. Our guide to Celexa and insomnia has practical fixes, such as timing your dose.
4. Metabolic and individual factors
Long-term SSRI use may have small effects on how the body handles energy, though the science here is unsettled. Age, genetics, thyroid function, menopause and starting weight all shape who gains. In the Petimar study, most participants were already overweight at the start, which is typical of real-world patients.
5. Other medicines and life changes
Many people on citalopram also take something else that affects weight: certain antipsychotics, mood stabilizers, steroids, some diabetes medicines, or hormonal birth control. Quitting smoking, a new desk job, an injury or a stressful season can all show up on the scale at the same time. Bring a full medicine list, including supplements, to your next appointment.
The 12-week weight-steady plan
This plan is about steadiness and heading off Celexa weight gain early, not weight loss. There are no calorie targets and no forbidden foods. The goal is to notice changes early and build habits that keep your energy, sleep and appetite in balance while the medicine does its job.
A note on eating disorders: If tracking food or weight makes you anxious, triggers restricting, bingeing or purging, or brings up past eating-disorder struggles, skip the tracking parts and talk to your care team first. The National Alliance for Eating Disorders runs a free helpline staffed by licensed therapists at 1-866-662-1235 (Monday to Friday, 9 a.m. to 7 p.m. Eastern). You can learn more about what happens when you call.
Weeks 1-4: set your baseline
- Pick one weigh-in rhythm. Once a week, same day, same time, similar clothes. Daily weigh-ins mostly measure water and can be discouraging.
- Write down how you feel, not just what you weigh. A two-line note on mood, energy and hunger helps you and your prescriber see patterns.
- Keep regular meals. Nausea in the first weeks can lead to grazing on crackers or sweets. Small, regular meals with some protein tend to settle the stomach better.
- Protect your sleep window. Aim for a consistent bedtime and wake time. If Celexa keeps you awake, ask your prescriber whether morning dosing makes sense for you.
Weeks 5-8: notice what’s changing
- Look for the craving window. If evening snacking has crept up, plan a satisfying dinner and a go-to option you actually enjoy, rather than trying to white-knuckle it.
- Add movement you’d do anyway. A 10-minute walk after meals, taking stairs, or stretching during TV time. Small and repeatable beats ambitious and abandoned.
- Check your drinks. Juice, sweet coffee drinks and alcohol add up quietly. Alcohol also worsens sleep and mood, and it doesn’t mix well with citalopram.
- Review the trend, not the number. A pound or two of drift is normal noise. A steady rise across four weekly weigh-ins is worth mentioning at your next visit.
Weeks 9-12: lock in and check in
- Keep the habits that stuck. Drop the ones that didn’t. Two or three solid routines are enough.
- Bring your notes to your follow-up. Mood, sleep, energy and weight trend together give your prescriber a much clearer picture than “I think I’ve gained.”
- Ask about routine checks. If you’ve gained steadily, your doctor may want to check things like thyroid function or blood sugar, depending on your history.
- Plan for the long haul. Since the BMJ data show risk peaking in years two and three, keep a monthly weigh-in going after the 12 weeks end.
If the plan feels like too much while you’re still depressed, that’s fine. Getting well comes first. Even one habit, such as regular sleep, does a lot of work.
When to talk to your prescriber about switching
Celexa weight gain that bothers you is a valid reason to raise your treatment plan. Many people stop antidepressants on their own because of weight, and that can backfire: stopping suddenly can cause discontinuation symptoms and a return of depression. Please don’t stop or lower your dose without talking to your prescriber first. Our guide to Celexa withdrawal explains why a planned taper matters.
Book an appointment, or send a portal message, if:
- You’ve gained about 5% of your starting body weight or more (for a 160-lb person, roughly 8 lb), especially within the first year.
- The gain is steady month after month, even with consistent habits.
- Weight worry is making you want to skip doses or quit.
- You have diabetes, prediabetes, sleep apnea, heart disease or another condition that weight gain could worsen.
- You notice other changes along with the weight, such as swelling, constant thirst, or extreme tiredness. These need checking for other causes.
Your prescriber has several options. They may review your dose (see our Celexa dosage guide for the standard range), look at other medicines you take, refer you to a dietitian, or discuss switching to a medicine with a lower weight effect, such as bupropion. Bupropion isn’t right for everyone; for example, it isn’t used in people with seizure disorders or certain eating disorders. Some people do best adding a second medicine rather than switching. That decision belongs to you and your prescriber together.
Mood check: Celexa carries a boxed warning about increased suicidal thoughts and behaviors in children, teens and young adults, especially when starting or changing a dose. If your mood worsens during a switch or at any time, call your prescriber right away. If you’re in crisis, call or text 988 (the Suicide & Crisis Lifeline in the US). For an emergency, call 911.
What the research can’t tell you
Averages hide individuals. A study reporting a one- to two-pound average gain includes people who lost weight, people who stayed the same and people who gained much more. Nobody can yet predict which group you’ll fall into before you start.
Most long-term evidence is observational. That means it shows links, not proof of cause. Depression itself, sleep changes, other medicines and life circumstances all affect weight. It’s also hard to know how many people in these studies were taking their medicine every day.
Finally, dose-specific data for citalopram’s weight effect are limited. The MedlinePlus citalopram page lists the common side effects most people notice, and weight change isn’t among the headline ones. That fits the overall picture: real for some people, but not a defining feature of this drug.
Frequently asked questions about Celexa and weight gain
How much weight do people gain on citalopram?
On average, not much. In short trials people lost about 0.5 kg, and in a large 12-month health-record study, citalopram users gained roughly one to two pounds. Some people gain more, especially over two to three years, while others lose weight or stay the same. Your own pattern can differ from the average, so tracking a monthly trend helps.
Does Celexa cause weight gain at 10 mg or 20 mg?
There isn’t solid research comparing weight change across specific citalopram doses. Lower doses aren’t proven to be weight-free, and higher doses aren’t proven to cause more gain. If you suspect your dose is affecting your weight, ask your prescriber before making any change, because adjusting the dose on your own can bring back symptoms or cause withdrawal effects.
Is Celexa or Lexapro worse for weight gain?
The difference is small. In a 2024 study of more than 183,000 adults, escitalopram (Lexapro) was linked to slightly more weight gain at six months than citalopram, both measured against sertraline. We’re talking about a few tenths of a kilogram. Other factors, such as heart rhythm risk and how well each one works for you, usually matter more when choosing.
Will I lose the weight if I stop taking Celexa?
Some people do, but not everyone, because the weight may be linked to recovered appetite, habits or other factors rather than the drug alone. Stopping also carries real risks, including withdrawal symptoms and relapse of depression. If weight is pushing you toward quitting, talk to your prescriber about a planned taper or a switch instead of stopping suddenly.
Which antidepressant is least likely to cause weight gain?
Bupropion (Wellbutrin) consistently shows the least weight gain, and sometimes slight loss, across several large studies. Mirtazapine sits at the other end, with the highest weight-gain risk. Citalopram falls in the middle with other SSRIs. Bupropion isn’t suitable for everyone, so your prescriber will weigh your full health history before recommending a switch.
The bottom line on celexa weight gain
Read across the ledger and a clear picture forms. In the short term, Celexa tends toward slight weight loss. Over six to twelve months, the average change is a pound or two of gain. Over two years and beyond, antidepressants as a group raise the odds of meaningful weight gain, with the risk peaking in years two and three, and citalopram sits in the middle of the pack rather than at the top. Celexa weight gain is real for some people, but it’s usually modest, often tied to recovery, and something you can watch for and manage.
If the scale is moving in a direction that worries you, keep taking your medicine as prescribed and bring your notes to your prescriber. Feeling better is the point of treatment. Weight is part of that conversation, not a reason to go it alone.
Medical disclaimer: This article is for general information only and isn’t a substitute for advice from your doctor, pharmacist or other qualified health professional. Don’t start, stop or change any medicine or dose without talking to your prescriber. If you think you’re having a medical emergency, call 911. If you’re having thoughts of suicide, call or text 988 in the US.
