Citalopram is not an antipsychotic. It belongs to a class of antidepressants called selective serotonin reuptake inhibitors (SSRIs) and is approved to treat depression. The confusion is understandable, though, because citalopram is sometimes prescribed for symptoms that antipsychotics also target, like agitation in people with dementia. Despite that overlap in use, the two drug classes work very differently in the brain and carry different side effect profiles.
What Citalopram Actually Is
Citalopram is one of the most commonly prescribed SSRIs, a family of antidepressants that also includes fluoxetine (Prozac), sertraline (Zoloft), and paroxetine (Paxil). Its job is narrowly focused: it blocks the reabsorption of serotonin in the brain, leaving more of it available between nerve cells. This gradual increase in serotonin activity is what helps regulate mood over time.
How selective is it? Citalopram is roughly 1,500 times more active on serotonin pathways than on norepinephrine, and about 3,900 times more selective for serotonin than for dopamine. That extreme selectivity is a defining feature. It means citalopram has almost no direct effect on dopamine, the neurotransmitter that antipsychotics primarily target.
The standard starting dose for adults is 20 mg once a day, taken in the morning or evening, with a maximum of 40 mg per day. For older adults, the dose stays at 20 mg. It typically takes one to two weeks before any improvement in symptoms, and four to six weeks to feel the full benefit. The NHS advises giving it at least six weeks before judging whether it’s working.
How Antipsychotics Differ
Antipsychotics and antidepressants treat fundamentally different problems through different mechanisms. Antipsychotics are designed primarily to manage conditions like schizophrenia and other psychotic disorders. They work largely by blocking dopamine receptors in the brain, which reduces symptoms like hallucinations, delusions, and disorganized thinking. Some newer (atypical) antipsychotics also act on serotonin receptors, but dopamine blockade remains their core mechanism.
Antidepressants like citalopram, by contrast, do not block dopamine receptors in any meaningful way. They restore the balance of serotonin (and sometimes norepinephrine) to ease depression, anxiety, and related mood disturbances. The side effect profiles reflect these differences. Antipsychotics can cause movement disorders, significant weight gain, and metabolic changes tied to their dopamine-blocking activity. Citalopram’s side effects tend to be milder and relate to serotonin changes: nausea, sleep disruption, sexual dysfunction, and headaches are the most common.
Why the Two Get Confused
One reason people wonder whether citalopram is an antipsychotic is that both drugs sometimes get prescribed for the same condition, particularly agitation in dementia. Antipsychotics have long been the go-to pharmacological option for managing agitation and behavioral symptoms in people with dementia. But concerns about their side effects in older adults have pushed clinicians to look for alternatives.
Citalopram has emerged as one of those alternatives. A systematic review and network meta-analysis published in Frontiers in Aging Neuroscience found that citalopram significantly reduced agitation scores in dementia patients compared to placebo, and was better tolerated than both typical and atypical antipsychotics. The researchers concluded that among the antidepressants studied, citalopram was “probably the only optimal intervention” for dementia-related agitation, with no statistically significant difference in safety compared to placebo. That kind of overlap in prescribing can easily lead someone to assume citalopram must be an antipsychotic, when it’s actually being used as a safer substitute for one.
When Citalopram Is Used Alongside Antipsychotics
In some cases, citalopram is prescribed not instead of an antipsychotic but in addition to one. People with schizophrenia, for example, sometimes take an SSRI alongside their antipsychotic medication. The rationale is that boosting serotonin may help with cognitive difficulties and negative symptoms (like emotional flatness and social withdrawal) that antipsychotics alone don’t fully address.
Research published in the Journal of Clinical Psychopharmacology explored this combination and noted an important practical detail: citalopram does not appear to change the blood levels of commonly used antipsychotics when taken together. That makes it a relatively safe add-on in terms of drug interactions. Still, being prescribed alongside an antipsychotic doesn’t make citalopram one. The two medications are doing different things in the brain, each targeting a different piece of the clinical picture.
The Bottom Line on Drug Class
Citalopram is an SSRI antidepressant, not an antipsychotic. It works almost exclusively on serotonin, has no significant dopamine-blocking activity, and is approved for treating depression. Its occasional use for agitation or as an add-on to antipsychotic therapy reflects its versatility, not a change in what it fundamentally is. If you’ve been prescribed citalopram and were expecting an antipsychotic, or vice versa, the distinction matters because the two classes treat different symptoms, work through different brain pathways, and carry different risks.