TikTok Benadryl Challenge poses significant overdose health risks.

Medical Mythbusting Commentary for September 1, 2020

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Source:
Benadryl Makers Beg Parents to Beware TikTok Challenge After Oklahoma Teen Reportedly Dies of Overdose

Consequences of overdose:

Flushing due to cutaneous vasodilation (“red as a beet”)
Anhydrosis (“dry as a bone”)
Hyperthermia due to loss of sweating (“hot as a hare”)
Blurry vision due to nonreactive mydriasis and paralysis of accommodation (“blind as a bat”)
Agitated delirium (“mad as a hatter”)
Urinary retention (“full as a flask”)
Decreased bowel sounds
Tachycardia