A pharmacy is a healthcare facility where medications are stored, prepared, and dispensed to patients. It involves the science and practice of discovering, producing, preparing, and reviewing drugs to ensure their safe and effective use. Pharmacists, who are trained healthcare professionals, play a crucial role in advising patients on the proper use of medications, potential side effects, and interactions with other drugs.play a crucial role in advising patients on the proper use of medications, potential side effects, and interactions with other drugs.