Pharmacists dispense prescription medications and provide information to patients about the drugs and their use. They also advise physicians and other healthcare workers on the selection, dosage, interactions, and side effects of medications to treat health problems. Pharmacists dispense prescription medications and provide information to pPharmacists dispense prescription medications and provide information to patients about the drugs and their use. They also advise physicians and other healthcare workers on the selection, dosage, interactions, and side effects of medications to treat health problems.atients about the drugs and their use. They also advise physicians and other healthcare workers on the selection, dosage, interactions, and side effects of medications to treat health problems.