Chapter VI of EDU MAP’s reference handbook for substance abuse covers medications without a prescription. 

Unconscious and unnecessary drug use  has a high impact on public health and treatment costs. Irrational drug use is common, especially in elderly patients, due to the prevalence of polypharmacy (multiple drug use).  Because of the addiction and other side effects of over-the-counter drug use, people need to be informed  and awareness needs to be increased.