Citalopram

What is Citalopram?

Citalopram is a prescription antidepressant medication that belongs to a class of drugs called selective serotonin reuptake inhibitors (SSRIs). It is primarily used to treat major depressive disorder and several anxiety-related conditions by helping to restore the balance of serotonin, a natural chemical in the brain that affects mood and emotions. Citalopram has been widely prescribed since its approval and is considered one of the most selective SSRIs available.

Uses

Citalopram is prescribed for several mental health conditions:

Major Depressive Disorder: The primary FDA-approved use, helping to relieve symptoms of depression including persistent sadness, loss of interest in activities, and feelings of worthlessness.

Generalized Anxiety Disorder: Often prescribed off-label to help manage excessive worry, restlessness, and physical symptoms of anxiety.

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Panic Disorder: May be used to reduce the frequency and intensity of panic attacks and associated anticipatory anxiety.

Social Anxiety Disorder: Sometimes prescribed to help individuals manage intense fear and avoidance of social situations.

Obsessive-Compulsive Disorder: Used off-label to help reduce obsessive thoughts and compulsive behaviors, though other SSRIs are typically preferred for this condition.

How it works

Citalopram works by blocking the reuptake of serotonin in the brain, which means it prevents nerve cells from quickly reabsorbing this important neurotransmitter after it has been released. This action increases the amount of available serotonin in the spaces between nerve cells, enhancing communication between neurons that regulate mood, anxiety, and other emotional responses. The therapeutic effects typically become noticeable after 4-6 weeks of consistent use, as the brain gradually adapts to the increased serotonin levels.

Side effects

Common side effects include:

• Nausea and digestive upset
• Drowsiness or fatigue
• Dry mouth
• Increased sweating
• Sleep disturbances (insomnia or vivid dreams)
• Sexual dysfunction (decreased libido, delayed orgasm)
• Headache
• Dizziness

Serious side effects to watch for:

• Suicidal thoughts or behaviors, especially in young adults under 25
• Serotonin syndrome (confusion, rapid heart rate, high fever, muscle rigidity)
• Abnormal bleeding or bruising
• Severe allergic reactions
• Heart rhythm abnormalities (QT prolongation)

Warnings and precautions

Black Box Warning: Citalopram carries an FDA black box warning regarding increased risk of suicidal thoughts and behaviors in children, adolescents, and young adults under 25, particularly during the first few months of treatment.

Heart conditions: Citalopram can cause QT interval prolongation, which may lead to dangerous heart rhythms. It should be used cautiously in patients with heart disease or those taking other medications that affect heart rhythm.

Pregnancy considerations: Citalopram is classified as pregnancy category C, meaning risks cannot be ruled out. Use during the third trimester may cause withdrawal symptoms in newborns.

Kidney and liver function: Dosage adjustments may be necessary for patients with severe liver impairment, as the drug is metabolized primarily in the liver.

Discontinuation: Stopping citalopram abruptly can cause withdrawal symptoms; gradual tapering under medical supervision is recommended.

Interactions

Monoamine oxidase inhibitors (MAOIs): Can cause dangerous serotonin syndrome; at least 14 days should separate use of these medications.

Other serotonergic medications: Combining with other antidepressants, tramadol, or triptans increases serotonin syndrome risk.

Blood thinners (warfarin): Citalopram may increase bleeding risk when combined with anticoagulant medications.

Heart rhythm medications: Drugs like quinidine or amiodarone can increase the risk of dangerous heart rhythm changes.

St. John’s Wort: This herbal supplement can increase serotonin levels and should be avoided during citalopram treatment.

Alcohol: Can enhance drowsiness and impair judgment; consumption should be limited or avoided.

NSAIDs: Anti-inflammatory drugs like ibuprofen may increase bleeding risk when taken with citalopram.

Omeprazole: This proton pump inhibitor can increase citalopram blood levels, potentially requiring dosage adjustments.

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Dosage

For adults with major depressive disorder, citalopram is typically started at 20mg once daily, taken either in the morning or evening. The dosage may be increased to a maximum of 40mg daily after at least one week, though 20mg is often sufficient for many patients. For adults over 60 years of age, the maximum recommended dose is 20mg daily due to increased risk of heart rhythm problems. Patients with liver impairment should also receive reduced doses. Dosage should always be determined and monitored by a qualified healthcare provider, who will consider individual patient factors and response to treatment.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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