Nasonex is used to treat Allergic Rhinitis. The generic version is called Mometasone furoate monohydrate. The average Nasonex cash price is about $253.08 for a supply of Suspension 50 MCG/ACT 17 Inhaler. You can reduce your Nasonex cost by up to 75% with our free Nasonex discount card. Bring it to a participating pharmacy near you to save on your prescription medication.