Lactic acidosis reported. Myelosuppression reported (use with caution in pre-existing myelosuppression, in patients receiving other drugs which may cause bone marrow suppression, or in chronic infection). Peripheral and optic neuropathy (with vision loss). Prolonged use may result in fungal or bacterial superinfection, including C. difficile-associated diarrhea and pseudomembranous colitis. Use with caution in carcinoid syndrome, in uncontrolled hypertension, in untreated hyperthyroidism, and in pheochromocytoma. Seizures reported (use with caution in history of seizures). Serotonin syndrome (symptoms of agitation, confusion, hallucinations, hyper-reflexia, myoclonus, shivering, and tachycardia) might occur with concomitant proserotonergic drugs (e.g. SSRIs/SNRIs or triptans) or agents which reduce metabolism of linezolid. Oral suspension contains phenylalanine. Exhibits mild MAOI properties and has potential to display the same interactions as other MAOIs.