It is usually given intravenously using an IV-line, the sole purpose is to bombard those nasty methemoglobin that have decided to be stingy with oxygen and refusing to give it out by basically reducing their carrying power for oxygen. So essentially their superpower which is ferric is being reduced by methylene blue to ferrous which is more willing to give out oxygen.
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Interesting. Wondering if methylene blue is poisonous ordinarily.
Well not necessarily poisonous, just that it comes with its own side effect even when used as a medication. That why it is always used under close supervision. And also at certain quantities that are high enough, it can become toxic.
Don't forget that all medications come with their side effects thats why we have dosage. Essentially drugs are mostly poisons given at controlled quantities to avoid death. Same goes with vaccines