Selon Contraindications

Hypersensitivity to the active substance or to any of the excipients.
Monoamine Oxidase Inhibitors (MAOIs).
Some cases presented with features resembling serotonin syndrome.
Citalopram should not be given to patients receiving MAOIs, including selegiline, in daily doses exceeding 10 mg/day.
Citalopram should not be given for fourteen days after discontinuation of an irreversible MAOI or for the time specified after discontinuation of a reversible MAOI (RIMA) as stated in the prescribing text of the RIMA.
MAOIs should not be introduced for seven days after discontinuation of citalopram.
Citalopram is contraindicated in combination with linezolid unless there are facilities for close observation and monitoring of blood pressure.
Citalopram is contraindicated in patients with known QT-interval prolongation or congenital long QT syndrome.
Citalopram is contraindicated together with medicinal products that are known to prolong the QT-interval.