Methylene blue is used for a variety of medical purposes, including treating methemoglobinemia, improve mitochondrial function, improve cognition, improve mood, certain infections (like COVID), and as a diagnostic tool among many others. Its applications can vary depending on the condition being treated. 

Follow the specific instructions provided by your healthcare provider. Methylene blue is most commonly administered by oral route with a capsule.  

Possible side effects can include nausea, headaches, blue/green urine, dizziness, and discoloration in the mouth or skin (site of application), increased perspiration, and extremity pain. Severe side effects like allergic reaction, sudden fever, yellowing/pale skin, weakness or confusion, chest pain, or shortness of breath are rare but should be reported to your healthcare provider immediately. 

Always ensure your provider and pharmacy are aware of all medications, supplements/vitamins, and over the counter medication that you may take, as there are certain medications that may interact. If you have a known G6PD deficiency consult with your provider as you may be at an increased risk of severe adverse events. Do not take if you are pregnant or breastfeeding without consulting with your provider. 

Store methylene blue as directed by your healthcare provider or according to the instructions provided with the medication. It is typically kept in a cool, dry place away from light often times under refrigeration.

If you miss a dose, take it as soon as you remember unless it’s almost time for your next dose. Do not double up to make up for a missed dose. Consult your healthcare provider for specific instructions. 

The time required to see results can vary based on the condition being treated and individual response. Your healthcare provider can give you a better estimate based on your treatment plan.