Fast acting. Active Ingredients: 1 Tablet: Meclizine HCI 25 mg Inactive Ingredients: Anhydrous Lactose; Corn Starch; Colloidal Silicon Dioxide; D&C Yellow #10 Aluminum Lake; Magnesium Stearate; Microcrystalline Cellulose Uses: For prevention and treatment of these symptoms associated with motion sickness: nausea, vomiting, dizziness. Provides up to 24 hours of protection.