Jacob Stevens, from Ohio, died on April 12 after overdosing on Benadryl as part of the social media challenge. He was filmed by his friends downing an alarming number of the anti-allergy pills.
The Benadryl Challenge trend, which has already killed two US teens, sees people swallow multiple antihistamines tablets before posting videos of their experience.
Destini Crane, from Portland, Oregon, burned her neck and arm while apparently trying to copy a trick where someone draws a shape with flammable liquid before setting it alright.