29 Oct Tweens Fail When it Comes to OTC Medicine Safety Awareness By Dr. Tanya In Dr. Tanya's Tips, Injuries, First Aid and Safety, Medical Information Research shows that tweens begin to self-medicate around 11 years old (approximately 5th to 6th grade). Yet, according to two recent surveys of 6th graders and their parents across the country, tweens got a failing grade on their knowledge of Read More Share: