Common side effects of citalopram include drowsiness, insomnia, nausea, weight changes (usually weight gain), increase in appetite, vivid dreaming, frequent urination, decreased sex drive, anorgasmia, dry mouth, increased sweating, trembling, diarrhea, excessive yawning, severe tinnitus, and fatigue.Less common side effects include bruxism, vomiting, cardiac arrhythmia, blood pressure changes, dilated pupils, anxiety, mood swings, headache, and dizziness.This can be done either by administering a single 20 mg dose of Fluoxetine or by beginning on a low dosage of Fluoxetine and slowly tapering down.Either of these prescriptions may be written in liquid form to allow a very slow and gradual tapering down in dosage.
Specifically, common side effects include difficulty becoming aroused, lack of interest in sex, and anorgasmia (trouble achieving orgasm).
In Spain and Denmark it is also used for obsessive–compulsive disorder.
citalopram is fifth in effectiveness (after mirtazapine, escitalopram, venlafaxine, and sertraline) and fourth in cost-effectiveness.
Rare side effects include convulsions, hallucinations, severe allergic reactions and photosensitivity.
Withdrawal symptoms can occur when this medicine is suddenly stopped, such as paraesthesiae, sleeping problems (difficulty sleeping and intense dreams), feeling dizzy, agitated or anxious, nausea, vomiting, tremors, confusion, sweating, headache, diarrhea, palpitations, changes in emotions, irritability, and eye or eyesight problems.
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When taken with an SSRI, such as citalopram, this can lead to levels of serotonin that can be lethal.