Methylene Blue

**Definition:** A compound consisting of dark green crystals or crystalline powder, having a bronze-like luster. Solutions in water or alcohol have a deep blue color. Methylene blue is used as a bacteriologic stain and as an indicator. It inhibits GUANYLATE CYCLASE, and has been used to treat cyanide poisoning and to lower levels of METHEMOGLOBIN.

**Tree numbers:** - D02.886.369.517 - D03.633.300.783.517

**Synonyms:** - Basic Blue 9 - Methylene Blue N - Methylthionine Chloride - Swiss Blue - Methylthioninium Chloride