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Citalopram

Citalopram Hydrobromide: Generic Medication Overview

• Therapeutic class: Antidepressants - selective serotonin reuptake inhibitor (SSRI)
• Active ingredient: Citalopram Hydrobromide
• Formulation: Oral pill (tablet)
• Available strengths: 10 mg, 20 mg tablets
• Prescription status: Prescription-only medication in Hong Kong, regulated under the Medicines and Poisons Ordinance by the Hong Kong Department of Health

Citalopram is prescribed to treat mood disorders and is supplied only on a doctor’s prescription. The tablets are taken by mouth and are typically packaged in blister packs that protect them from moisture.

How Citalopram Works in the Body

Citalopram belongs to the SSRI family. It blocks the reabsorption (reuptake) of the neurotransmitter serotonin at the synaptic cleft of neurons in the brain. By leaving more serotonin available, it helps to improve mood, alleviate anxiety, and normalize sleep-wake cycles.

• Onset of action: Patients often notice clinical improvement after 2-4 weeks of regular use.
• Peak effect: Maximum therapeutic effect is usually reached after 6-8 weeks.
• Duration: The drug’s half-life is about 35 hours, allowing once-daily dosing.

The selective action on serotonin makes citalopram less likely to affect other neurotransmitter systems compared with older antidepressants.

Conditions Treated by Citalopram

• Major Depressive Disorder (MDD): FDA- and EMA-approved indication and the primary use approved by the Hong Kong Department of Health.
• Other clinical situations: In Hong Kong, citalopram may be prescribed off-label for anxiety-related conditions (see the off-label section).

Citalopram is suitable for adult patients who meet diagnostic criteria for depression and who have no contraindicating medical conditions.

Evidence-Based Off-Label Uses

• Generalized Anxiety Disorder (GAD): Several randomized controlled trials have shown benefit, though citalopram is not formally approved for this indication in Hong Kong.
• Panic Disorder: Limited evidence supports efficacy; use requires careful clinical judgment.
• Obsessive-Compulsive Disorder (OCD): Small-scale studies suggest improvement, but larger trials are lacking.

Off-label use requires medical supervision and an individualized risk assessment.

Who Should Not Use Citalopram?

Absolute Contraindications

• Known hypersensitivity to citalopram or any excipients in the tablet.
• Concurrent use of monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping an MAOI.
• Use of pimozide or thioridazine (due to risk of QT prolongation).

Relative Contraindications

• Pregnancy & lactation: Citalopram crosses the placenta and is excreted in breast milk; risk-benefit assessment is required.
• Elderly patients (> 60 years): Higher susceptibility to QT prolongation; start with the lowest dose and monitor ECG.
• Severe hepatic impairment: Dose reduction may be necessary.
• Renal impairment: No dose adjustment needed for mild to moderate dysfunction, but monitor for accumulation in severe cases.

Patients with a personal or family history of cardiac arrhythmias, especially prolonged QT interval, should discuss alternative therapies with their prescriber.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Nausea or gastrointestinal upset
• Headache
• Dry mouth
• Insomnia or somnolence (varies by individual)
• Increased sweating

These effects are usually mild and tend to improve within the first few weeks of therapy.

Serious Adverse Events

• Serotonin syndrome: Agitation, hyperthermia, muscle rigidity, and rapid heart rate; seek emergency care if suspected.
• QT interval prolongation: May lead to arrhythmias, especially at higher doses or in vulnerable patients.
• Suicidal thoughts: Close monitoring is essential during the initial treatment period, particularly in young adults.
• Bleeding risk: Enhanced effect of anticoagulants or antiplatelet agents may increase bleeding tendency.

Drug Interactions

• Major interactions (avoid or adjust therapy):

• MAO inhibitors (phenelzine, tranylcypromine) - risk of serotonin syndrome.

• Pimozide, thioridazine - can cause severe QT prolongation.

• Other serotonergic agents (triptans, linezolid, other SSRIs/SNRIs) - increase serotonin syndrome risk.

• Moderate interactions (require monitoring):

• Anticoagulants (warfarin, direct oral anticoagulants) - may increase bleeding.

• CYP2C19 inhibitors (omeprazole, fluvoxamine) - can raise citalopram plasma levels.

Patients should provide a full medication list, including over-the-counter products and herbal supplements, to their prescriber.

Food and Lifestyle Interactions

• Alcohol: May enhance CNS depression and increase suicidal ideation; limit intake.
• Driving/operating machinery: Initial therapy can cause dizziness or drowsiness; assess personal tolerance before performing safety-critical tasks.
• Dietary considerations: No specific food restrictions, but grapefruit juice can affect CYP3A4 metabolism and should be used cautiously.

How to Take Citalopram

• Standard dosing:
• Start with one 10 mg tablet taken once daily, preferably in the morning or evening based on tolerability.
• Dose may be increased to 20 mg daily after at least one week, depending on clinical response and side-effect profile.
• Special populations:
• Elderly (> 60 years): Begin and remain at 10 mg daily; avoid exceeding 20 mg without ECG monitoring.
• Hepatic impairment: Consider starting at 10 mg and titrating cautiously.
• Administration tips:
• Swallow the tablet whole with a full glass of water.
• Can be taken with or without food; consistent timing aids steady blood levels.
• Missed dose: Take the missed tablet as soon as remembered unless it is near the time of the next scheduled dose; do not double the dose.
• Overdose: Symptoms may include nausea, vomiting, tremor, and seizures. Seek immediate medical attention; activated charcoal may be administered in the emergency setting.
• Discontinuation: Gradual tapering (e.g., reduce by 5-10 mg every 1-2 weeks) is recommended to minimise withdrawal phenomena such as dizziness, electric-shock sensations, or mood swings.

Monitoring and Follow-Up

• Clinical assessment: Evaluate depressive symptoms and adverse effects at 2-week intervals during the titration phase, then at least every 3 months once the dose is stable.
• Suicidality: Monitor for emergence or worsening of suicidal thoughts, especially during the first month of treatment.
• Cardiac monitoring: Baseline ECG is advisable for patients > 60 years, those with cardiac disease, or when doses approach the upper limit.
• Laboratory testing: Routine labs are not required, but liver function tests may be considered in patients with known hepatic disease.

Regular follow-up with a qualified healthcare professional ensures safe and effective therapy.

Storage and Handling

• Store tablets at room temperature (15 °C-30 °C), away from excess moisture and direct sunlight.
• Keep the medication out of reach of children; use child-proof containers.
• Do not use tablets beyond the expiration date printed on the packaging.
• Dispose of unused medication according to local pharmacy take-back programmes or the Hong Kong Department of Health’s guidelines for drug disposal.

Medication-Specific Glossary

Serotonin Reuptake Inhibition

The process by which citalopram blocks the transporter that normally reabsorbs serotonin into presynaptic neurons, increasing serotonin availability in the synaptic cleft.

QT Prolongation

An extension of the heart’s electrical repolarisation interval on an ECG; prolonged QT can predispose to serious arrhythmias such as torsades de pointes.

Serotonin Syndrome

A potentially life-threatening condition caused by excessive serotonergic activity, characterised by mental status changes, autonomic instability, neuromuscular abnormalities, and hyperthermia.

Medical Disclaimer

This article provides educational information about citalopram and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.