Citalopram is not a benzodiazepine. It is a selective serotonin reuptake inhibitor (SSRI), a completely different class of medication that works through a different brain system, carries a different risk profile, and is not a controlled substance. The confusion is understandable because both citalopram and benzodiazepines are commonly prescribed for anxiety, but they are fundamentally different drugs.
How Citalopram Works vs. Benzodiazepines
The core difference comes down to which chemical messenger each drug targets in the brain. Citalopram works on serotonin, a neurotransmitter involved in mood regulation. It blocks the brain’s recycling of serotonin so that more of it stays active between nerve cells. This gradual buildup is why SSRIs like citalopram take several weeks to reach full effect.
Benzodiazepines work on an entirely different system. They enhance the activity of GABA, the brain’s primary calming chemical, which is why they produce rapid sedation and muscle relaxation. Citalopram has no meaningful interaction with GABA receptors, benzodiazepine receptors, or opioid receptors. Its chemical structure is also unrelated to tricyclic antidepressants, tetracyclic antidepressants, or even other SSRIs.
This distinction matters practically. Benzodiazepines calm anxiety within 30 to 60 minutes but wear off in hours. Citalopram takes weeks to work but provides steady, around-the-clock mood and anxiety support once it does. Some people are prescribed both during the first few weeks of SSRI treatment: a benzodiazepine for immediate relief while the SSRI builds up in the system.
What Citalopram Is Prescribed For
The FDA approved citalopram (brand name Celexa) for treating major depressive disorder in adults 18 and older. It has been available since the 1980s in the U.S. and Europe. The standard starting dose is 20 mg once daily, taken with or without food, with a maximum of 40 mg daily. For adults over 60 or those with liver problems, the maximum is 20 mg.
Doctors also prescribe citalopram off-label for a wide range of conditions: generalized anxiety disorder, panic disorder, social anxiety disorder, obsessive-compulsive disorder, PTSD, premenstrual dysphoric disorder, binge eating disorder, and separation anxiety. This overlap with anxiety treatment is likely one reason people wonder whether citalopram might be a benzodiazepine.
Controlled Substance Status
Benzodiazepines are Schedule IV controlled substances under the DEA, meaning they have a recognized potential for abuse and dependence. Prescriptions are tracked, refills are limited, and pharmacies treat them with additional oversight. Citalopram is not a controlled substance at all. There are no DEA scheduling restrictions on it, and prescriptions can be refilled without the same regulatory hurdles.
Dependency and Withdrawal Differences
One area where the line between SSRIs and benzodiazepines gets blurry is withdrawal. Benzodiazepines are well known for causing physical dependence, sometimes severe, with symptoms like seizures, rebound anxiety, and insomnia when stopped abruptly. The medical community has long classified this as a dependence syndrome.
SSRIs like citalopram can also cause uncomfortable symptoms when stopped too quickly, a phenomenon called “discontinuation syndrome.” These symptoms include dizziness, irritability, nausea, brain zaps (brief electric-shock sensations), and sleep disturbances. A 2011 study published in Addiction Research and Theory compared the two and found that discontinuation symptoms were described in remarkably similar terms for both drug classes, with 37 of 42 identified withdrawal symptoms overlapping between benzodiazepines and SSRIs. The researchers argued that calling it “dependence” for benzodiazepines but merely “discontinuation” for SSRIs was not a scientifically consistent distinction.
That said, SSRI withdrawal is generally considered less dangerous than benzodiazepine withdrawal. It does not carry the same seizure risk and can usually be managed by tapering the dose gradually over weeks. The key point is that stopping citalopram abruptly is not recommended, even though it is not classified as addictive in the way benzodiazepines are.
Common Side Effects of Citalopram
Because citalopram targets serotonin rather than GABA, its side effect profile looks different from a benzodiazepine’s. The most commonly reported side effects include decreased sexual desire or difficulty with sexual function, drowsiness, and changes in ejaculation. Nausea, dry mouth, and increased sweating are also common, particularly in the first few weeks.
Benzodiazepines, by contrast, are more strongly associated with sedation, impaired coordination, memory problems, and cognitive slowing. Citalopram can cause drowsiness, but it does not typically produce the heavy, immediate sedation that benzodiazepines do. It also does not impair motor coordination in the same way, which is why SSRIs are generally considered safer for long-term daily use.