What are the main differences between drugs and NHPs?

1. What are three possible ways in which caffeine use by a woman might interfere with reproduction?

2. What are the main differences between drugs and NHPs?

3. What are the criteria for deciding whether a drug should be sold OTC or by prescription?

4. Why are some OTC drugs kept behind the counter?

5. What is the main ingredient found in OTC sleep aids?