Dihydroergotamine Mesylate Nasal Spray 4 mg by Advagen Pharma (RX)Dihydroergotamine Mesylate Nasal Spray is a medication used for the treatment of acute migraine headaches with or without aura. It is especially useful for patients who find oral medications ineffective or unsuitable due to nausea. Key Details of Dihydroergotamine Mesylate Nasal Spray by Advagen Pharma: Active Ingredient: Dihydroergotamine Mesylate, a medication belonging to the ergot alkaloid class, which works by constricting blood vessels around