Final answer:
Pharmacists dispense drugs prescribed by doctors and provide advice on drug usage and effects.
Step-by-step explanation:
A pharmacist dispenses drugs that have been prescribed by a doctor. In the United States, pharmacists must hold a doctorate in pharmacy and be licensed by the state in which they work. They must have a strong understanding of chemistry and biology to comprehend the effects of drugs on the body. Pharmacists can provide advice to physicians regarding drug selection, dosage, interactions, and side effects. They can also guide patients on the proper use of medications.