Methylene Blue is a versatile medication with important clinical uses. It is widely employed in the treatment of methemoglobinemia, a condition where hemoglobin cannot carry oxygen effectively, by restoring normal oxygen transport in red blood cells. It also serves as a diagnostic dye in medical procedures and is used during certain surgeries to highlight tissues. In psychiatry and neurology, methylene blue has been studied for its neuroprotective and cognitive‑enhancing properties, showing potential in Alzheimer’s disease and mood disorders. Additionally, it is used as an antidote for cyanide poisoning and has antimicrobial activity, making it valuable in diverse therapeutic settings.