Citalopram is an antidepressant medication that is commonly used to treat depression, anxiety and panic disorders. It belongs to a class of drugs called selective serotonin reuptake inhibitors (SSRIs). When taken orally, citalopram works by increasing the level of serotonin, a neurotransmitter, in the brain.

Like all medications, citalopram can cause side effects. Some of the most common side effects include:

Nausea: This is one of the most common side effects and usually goes away after a few days of taking the medication.
Diarrhea: This can occur as a result of the medication altering the normal balance of bacteria in the intestines.
Constipation: This is another digestive side effect that can occur as a result of taking citalopram.
Headache: This is a common side effect and can be caused by the medication’s effect on the blood vessels in the head.
Drowsiness: This can be a side effect, especially when first starting the medication or if the dose is increased.
Dizziness: This can occur as a result of changes in blood pressure and balance caused by the medication.
Trouble sleeping: Some people taking citalopram may have trouble sleeping, especially if they take the medication in the evening.
Increased sweating: This can be a side effect of taking citalopram, especially in people who are prone to sweating.
Decreased sex drive or difficulty achieving an orgasm: This is a common side effect and can be distressing for some people.
Dry mouth: This is a common side effect of citalopram and can be due to the medication decreasing the production of saliva.
There are also some serious side effects that require immediate medical attention, including:

Allergic reactions: If you experience a rash, hives, itching, difficulty breathing, chest tightness, swelling of the mouth, face, lips, or tongue, stop taking citalopram and seek medical attention immediately.
Seizures: This is a rare but serious side effect that requires immediate medical attention.
Changes in vision: If you experience changes in vision, such as blurring, double vision, or seeing halos around lights, stop taking citalopram and seek medical attention immediately.
Hallucinations: If you experience hallucinations, stop taking citalopram and seek medical attention immediately.
Unusual behavior: If you experience unusual behavior or thoughts, stop taking citalopram and seek medical attention immediately.
Fast, irregular or pounding heartbeat: If you experience a fast, irregular or pounding heartbeat, stop taking citalopram and seek medical attention immediately.
Mania: If you experience mania, which is characterized by unusual excitement, agitation, and irritability, stop taking citalopram and seek medical attention immediately.
It’s important to talk to your doctor if you experience any side effects while taking citalopram. Your doctor may be able to adjust the dose or switch you to a different medication if necessary.