Unisom Liquid is an effective and non-habit forming sleep-aid that contains the #1 Pharmacist Recommended Sleep-Aid Ingredient - Diphenhydramine HCl. Just one dose of cherry flavored Unisom Liquid will help you drift off to sleep quickly and safely for a full night of rest. The soothing liquid is easy to take - there's no need for water, and it is ideal for anyone that struggles with swallowing pills.