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. providing information and advice about drugs, their side effects, correct dosage and proper storage. providing other health advice, such as guidance on stopping smoking. keeping records such as pharmacy files, patient profiles, charge system files, inventories, and registries of poisons, narcotics or controlled drugs.