Methenamine Sodium Phosphate Monobasic Monohydrate Phenyl Sa + Phenytoin Interaction
Moderateinteraction on record
Description
Methylene blue inhibits CYP2C9 and CYP2C19 metabolism. Phenytoin has narrow therapeutic index; clinical relevance unknown but concurrent use requires caution.
Mechanism
CYP2C9/2C19 inhibition by methylene blue
Source: NLP:methenamine, sodium phosphate monobasic, phenyl salicylate, methylene blue, and hyoscyamine sulfate