Pharmacists must understand the purpose, chemical make-up, and effects of drugs. This is so they can prevent harmful interactions between the drugs their clients are taking. Pharmacists also use computer programs to keep records of patientsprescriptions. These programs help watch for harmful mixing of drugs. Pharmacists rarely mix the ingredients for medicines.
Most medicines now come from the manufacturer in standard dosages.
Pharmacists also use computers to control inventory and print labels. Pharmacists who own or manage pharmacies have additional duties. They order goods as well as prescription medicines. They also may hire and supervise personnel. These pharmacists may also oversee someone who keeps track of income and expenses.