Methylene blue USP BP refers to the pharmaceutical grade of methylene blue that satisfies the requirements. It is a synthetic dye having many uses in both medicine and science, methylene blue. The quality, purity, and potency of medications and chemicals used in the pharmaceutical industry. When a substance is marked as "USP-BP," it means that it has met the quality, purity, and potency requirements set forth by the USP and BP, two reference standards utilised by the pharmaceutical industry. Methylene blue USP BP is a dye or staining agent with a number of medical applications. In addition to being known to treat urinary tract infections, it has been licenced for the treatment of methemoglobinemia.