As a medication, Chang's doctor prescribed him a drug with serious restrictions. However, Chang started overdosing on it. This act had severe

Implications on his physical and mental state. To which category could this drug belong?

Answer: Schedule (2) two drug

Explanation: Although it's virtually difficult or impossible to design a set of defining drug classification standards because even experts have struggled on which drugs should be and not be on a particular schedule but drugs are generally categorised based on their abuse rate (misuse and physical dependency) and their medical use. Drugs with no medical use and higher abuse rate which has physical and mental implications are placed under schedule one, drugs with medical use but also higher abuse rate with physical and mental implications are placed under schedule two, drugs with lower or moderate abuse rate are placed under schedule three, drugs with low potential for dependency are place under schedule four and drugs which are mostly use for antidiarrheal, analgesic and antitussive are placed under schedule five.

Chang's drug has medical use because it was prescribed by his doctor, it also has a high abuse rate because he started overdosing on them which led to a severe physical and mental implications.

Therefore Cheng's drugs will mostly likely be categorised as a schedule (2) two drug.