Effects on the human body of taking chemical substances to enhance performance improve health or address specific medical condition:
1. How do certain classes of drugs help with neurotransmission in the brain?
2. How do common antidepressants work and what are their side effects?
3. How do statin drugs work to lower cholesterol and what the possible side effects?
4. How do steroid drugs work to heal and build tissues and enhance athletic performance, and what are the negative long term effects?