MDLinxViral Benadryl Trend Resurfaces—and It’s Been Linked to Multiple Adolescent Hospitalizations and Deaths

⚠️ Rare but High Risk Safety Event

A viral “Benadryl Challenge,” first popularized in 2020, has resurfaced among adolescents taking up to 12x the standard diphenhydramine dose to induce hallucinations. Recent cases include a 15-year-old with seizures and cardiac arrest and a teen requiring medevac after ingesting 70 tablets.

Patient Counseling Points

• Diphenhydramine overdose can cause heart arrhythmias, hyperthermia, seizures, and death, even with doses well above the standard amount
• Warning signs of toxicity include dilated pupils, rapid heartbeat, slurred speech, jerking movements, and unresponsiveness
• Even at recommended doses, diphenhydramine carries risks of sedation and paradoxical hyperactivity, particularly in pediatric patients
• Many pediatricians are shifting toward second-generation antihistamines (e.g., cetirizine) for routine allergy symptoms, citing lower sedation and no abuse potential

Patient Care Applications

• Warn teens and caregivers that over-the-counter status does not equal safety at high doses
• Recognize behavioral changes, flushing, or dry mouth as early signs of diphenhydramine misuse
• Redirect families toward second-generation antihistamines for routine allergy management
• Interpret unexplained adolescent seizures or altered mental status with a differential that includes antihistamine overdose