Adverse Effects
When used for short periods, linezolid is a relatively safe drug. Common side effects of linezolid use (those occurring in more than 1% of people taking linezolid) include diarrhea (reported by 3–11% of clinical trial participants), headache (1–11%), nausea (3–10%), vomiting (1–4%), rash (2%), constipation (2%), altered taste perception (1–2%), and discoloration of the tongue (0.2–1%). Fungal infections such as thrush and vaginal candidiasis may also occur as linezolid suppresses normal bacterial flora and opens a niche for fungi (so-called antibiotic candidiasis). Less common (and potentially more serious) adverse effects include allergic reactions, pancreatitis, and elevated transaminases, which may be a sign of liver damage. Unlike some antibiotics, such as erythromycin and the quinolones, linezolid has no effect on the QT interval, a measure of cardiac electrical conduction. Adverse effects in children are similar to those that occur in adults.
Like nearly all antibiotics, linezolid has been associated with Clostridium difficile-associated diarrhea (CDAD) and pseudomembranous colitis, although the latter is uncommon, occurring in about one in two thousand patients in clinical trials. C. difficile appears to be susceptible to linezolid in vitro, and linezolid was even considered as a possible treatment for CDAD.
As of 2009, linezolid is a "black triangle drug" in the United Kingdom, meaning that it is under intensive postmarketing surveillance by the Commission on Human Medicines of the Medicines and Healthcare products Regulatory Agency.
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