The FDA has received reports of serious side effects in people who have mistakenly swallowed the product. Some OTC Benadryl products are intended to be swallowed. However, Benadryl Extra Strength Itch Stopping Gel is only safe and effective when used, as directed, on the skin. People swallowing the gel can ingest a dangerous amount of the active ingredient, diphenhydramine. Large doses of diphenhydramine can result in serious side effects such as unconsciousness, hallucinations, and confusion.
"Consumer confusion and incorrect product use are serious public health issues," said Carol Holquist, R.Ph., director of FDA's Division of Medication Error Prevention and Analysis. "FDA is advising consumers and pharmacies to store products for the skin separately from products that should be swallowed."