Galen, in 2d-century Rome, classified pharmacy in terms of their supposed effects on the four humors blood, phlegm, yellow bile, and black bile. Federally funded health-care programs require pharmacists to monitor the effectiveness of chemical therapy in certain patients and to make recommendations about continuance or change. The pharmacist is also responsible for helping to ensure that a proper program is appropriate for a patient, based partly on how much detailed and timely knowledge of the patient's condition is at hand. Further, he or she should inform the person administering or taking the chemical about its proper use, side effects, and dangers. Their preparation, and their proper use to treat illness by cure, control, and prevention.
Modern pharmacy is so complex and rapidly changing that no one can know or practice all of it.
These are created either through synthesis by pharmaceutical chemists or through collection and purification from natural sources by experts in pharmacognosy. He thus created a systematic guide for selecting these, which, unfortunately, was scientifically incorrect. From the 7th century until the Middle Ages, Arabs contributed a large body of knowledge concerning available items. History Until perhaps only 1,000 years ago practitioners of religion and magic controlled medicine because so many aspects of disease lay outside observation, explanation, and control. Moreover, scientific method and application of scientific principles to pharmacy have taken effect only in the last 50 to 100 years.