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Linezolid is used for gram-positive infections resistant to conventional therapy (e.g., Vancomycin-resistant enterococcus and Methicillin Resistant Staph Aureus). Linezolid is an oxazolidinone, but more importantly it is a weak monoamine oxidase inhibitor (MAOI) and serotonin syndrome (e.g., altered mental status, neuromuscular abnormalities, autonomic instability) may occur when combined with selective serotonin re-uptake inhibitors (SSRIs) or with recent discontinuation of SSRI.
Be aware that the following drugs can precipitate serotonin syndrome when combined with Linezolid:
Mirtazpine Buproprion Fentanyl
Trazodone Buspirone Bromocryptine
Levodopa Lithium Amphetamines
Cocaine Codeine Reserpine
Ergots MAOI's
References
Narita, M. Linezolid-Associated Peripheral and Optic Neuropathy, Lactic Acidosis, and Serotonin Syndrome Pharmacotherapy (2007) vol. 27 (8) pp. 1189-97