Linezolid is used to treat pneumonia, infections of the skin, and infections caused by a resistant bacterium (Enterococcus faecium). Methylene blue is used to treat methemoglobinemia, vasoplegic syndrome, ifosfamide-induced encephalopathy, and cyanide poisoning. It is also used as a dye in diagnostic applications. The FDA recommends these two drugs not be given to patients taking serotonergic drugs, but recognizes there are some conditions that may be life-threatening or require urgent treatment with those drugs.
Timely news about psychiatric drugs can be found regularly in the "Med Check" column of Psychiatric News. See the latest at http://pn.psychiatryonline.org/content/46/12/18.2.full.