In France, no longer found methylene blue, which previously was part of all family pharmacies and was very effective for mouth ulcers, sore throat, etc. Certainly, it was the language and the blue urine but it passed after a few hours. Like many other practical, effective and cheap, methylene blue was withdrawn from sale in pharmacies. It is however always to treat fish diseases (white dots, fin necrosis). Now, as everyone knows, fish (especially exotic) are, with the birds, extremely sensitive to harmful products. If methylene blue was harmful, he would kill them instantly, which is not the case. So why is it not found for human use? Anyone have the answer.