The histamine blocker.AntihistamineJ & JActive Ingredients:(In Each Tablet): Diphenhydramine HCI 25 mgTake every 4 to 6 hours. Do not take more than 6 times in 24 hours. Adults and children 12 years and over: 1 to 2 tablets. Children 6 to under 12 years: 1 tablet. Children under 6 years: Do not use this product in children under 6 years of age. Store between 20-25 degrees C (68-77 degrees F). Avoid high humidity. Protect from light.Inactive Ingredients:Carnauba Wax; Crospovidone; D&C Red #27 Aluminum Lake; Dibasic Calcium Phosphate Dihydrate; Hypromellose; Magnesium Stearate; Microcrystalline Cellulose; Polyethylene Glycol; Polysorbate 80; Pregelatinized Starch; Stearic Acid; Titanium Dioxide; Each Tablet Contains: Calcium 15 mgUses:Temporarily relieves these symptoms due to hay fever or other upper respiratory allergies: runny nose; sneezing; itchy, watery eyes; itching of the nose or throat. Temporarily relieves these symptoms due to the common cold: runny nose; sneezing. Small tablet size. Child-resistant packaging.Do not use with any other product containing diphenhydramine, even one used on skin. Ask a doctor before use if you have: a breathing problem such as emphysema or chronic bronchitis; glaucoma; trouble urinating due to an enlarged prostate gland. Ask a doctor or pharmacist before use if you are taking sedatives or tranquilizers. When using this product: marked drowsiness may occur; avoid alcoholic drinks; alcohol, sedatives, and tranquilizers may increase drowsiness; be careful when driving a motor vehicle or operating machinery; excitability may occur, especially in children. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away (1-800-222-1222).