Calanex is a brand name for a medication that combines two active ingredients: verapamil and diphenhydramine. Verapamil is a calcium channel blocker primarily used to treat high blood pressure and certain heart conditions, while diphenhydramine is an antihistamine commonly used to relieve allergy symptoms and as a sleep aid. The combination may be prescribed for specific medical conditions, but it's important to consult a healthcare provider for proper use and potential side effects.