Tech ‘Benadryl Challenge’ on TikTok can cause ‘serious problems,’ the FDA warns September 25, 2020Dalvin Brown, USA TODAYComments Off on ‘Benadryl Challenge’ on TikTok can cause ‘serious problems,’ the FDA warns The FDA said Thursday that "serious problems" for teens could occur if high doses of the allergy medication Benadryl are ingested.