BENADRYL Extra Strength Itch Relief Stick, 0.47 fluid ounces (14 mL). Get extra strength itch relief from BENADRYL and protect your skin with this easy-to-apply stick. Stop itching that rash and feel better. Active ingredients: diphenhydramine HCl 2% (topical analgesic) and zinc acetate 0.1% (skin protectant).