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A pharmaceutical drug - medicine or medication - is any chemical substance formulated or compounded as single active ingredient or in combination of other pharmacologically active substance, it may be in a separate but packed in a single unit pack as combination product intended for internal, or external or for use in the medical diagnosis, cure, treatment, or prevention of disease.
Medications are classified in various ways. One of the key divisions is between traditional small molecule drugs, usually derived from chemical synthesis, and biopharmaceuticals, which include recombinant proteins, vaccines, blood products used therapeutically, gene therapy, and cell therapy.Pharmaceuticals are classified in various other groups besides their origin on the basis of pharmacological properties like mode of action and their pharmacological action or activity, route of administration, biological system affected, or therapeutic effects.