Many drugs can interact with methylene blue. During your treatment with this medicine, do not start or stop using any other medications without your doctor's advice.
If you take an antidepressant or psychiatric medication, call your doctor right away if you have signs of a serious drug interaction, including: confusion, memory problems, feeling hyperactive (mentally or physically), loss of coordination, muscle twitching, shivering, sweating, diarrhea, and/or fever.
Before taking this medicine
You should not use this medicine if you are allergic to hyoscyamine, methenamine, methylene blue, phenyl salicylate, or sodium biphosphate.
During your treatment with this medicine, do not start or stop using any other medications unless your doctor tells you to.
To make sure this medicine is safe for you, tell your doctor if you have:
heart disease;
a heart rhythm disorder;
congestive heart failure;
coronary heart disease;
a heart valve disorder;
glaucoma;
an enlarged prostate or bladder obstruction;
myasthenia gravis;
an ulcer or obstruction in your stomach;
an allergy to belladonna (Donnatal and others); or
an allergy to salicylates (such as aspirin, choline magnesium trisalicylate, magnesium salicylate).
It is not known whether this medication will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medicine.
This medicine can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
Do not give this medicine to a child without medical advice.
