Citalopram is an antidepressant medication that is commonly used to treat depression, anxiety and panic disorders. It works by increasing the levels of serotonin, a neurotransmitter, in the brain, which can help to improve mood and reduce symptoms of depression and anxiety. The recommended starting dose of citalopram is usually 20 mg taken orally once a day, usually in the morning.

Like all medications, citalopram can cause side effects, and some people may experience more side effects than others. Some of the most common side effects of citalopram 20 mg include:

Nausea: This is one of the most common side effects and can occur in the first few days of taking the medication. It usually goes away after a few days.
Diarrhea: This can be a side effect of citalopram, especially in the first few days of taking the medication.
Constipation: This can also be a side effect of citalopram and can occur as a result of the medication altering the normal balance of bacteria in the intestines.
Headache: This is a common side effect of citalopram and can be caused by the medication’s effect on the blood vessels in the head.
Drowsiness: This can be a side effect of citalopram, 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 may have trouble sleeping while taking citalopram, especially if they take the medication in the evening.
Increased sweating: This can be a side effect of citalopram, especially in people who are prone to sweating.
Decreased sex drive or difficulty achieving an orgasm: This is a common side effect of citalopram and can be distressing for some people.
Dry mouth: This can be a 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. It’s also important to note that everyone’s experience with citalopram is unique, and not everyone will experience the same side effects. If you are having trouble managing your side effects, or if your side effects are affecting your quality of life, be sure to talk to your doctor.