3.5 fl oz / 103ml - US IMPORT. Benadryl Extra Strength Anti Itch Relief Gel. Get fast and cooling relief from pain and itching when you need it most with Benadryl Extra-Strength Itch Stopping Gel. Made with 2% diphenhydramine HCI topical analgesic, this cooling anti-itch and pain relief topical gel blocks the histamine that causes minor pain and itching associated with insect bites, mosquito bites, scrapes, minor skin irritations, burns, and cuts as well as relief of pain and itching associated with sunburns.