what is medical drugs

In the United States, the Federal Food, Drug, and Cosmetic Act defines what requires a prescription. Prescription drugs are generally authorized by veterinarians, dentists, optometrists, medical practitioners, and advanced practice nurses. It is generally required that an MD, DO, PA, OD, DPM, NMD, ND, DVM, DDS, or DMD, some Psychologists (see Medical Psychology), clinical pharmacists, Nurse Practitioners and other APRNs write the prescription; basic-level registered nurses, medical assistants, emergency medical technicians, most psychologists, and social workers as examples, do not have the authority to prescribe drugs.[1]
The package insert for a prescription drug contains information about the intended effect of the drug and how it works in the body. It also contains information about side effects, how a patient should take the drug, and cautions for its use, including warnings about allergies.
The safety and effectiveness of prescription drugs in the US is regulated by the federal Prescription Drug Marketing Act of 1987. The Food and Drug Administration (FDA) is charged with implementing this law.
As a general rule, over-the-counter drugs (OTC) are used to treat conditions not necessarily requiring care from a health care professional and have been proven to meet higher safety standards for self-medication by patients. Often a lower strength of a drug will be approved for OTC use, while higher strengths require a prescription to be obtained; a notable case is ibuprofen, which has been widely available as an OTC pain killer since the mid-1980s but is still available by prescription in doses up to four times the OTC dose for use in cases of severe pain not adequately controlled by the lower, OTC strength.
Herbal preparations, amino acids, vitamins, minerals, and other food supplements are regulated by the FDA as dietary supplements. Because specific health claims cannot be made, the consumer must make informed decisions when purchasing such products. In June 2007, the FDA issued the Dietary Supplement Current Good Manufacturing Practice (CGMP) Final Rule FDA 21 CFR Part 111. In essence, the final rule requires that the proper controls be in place for dietary supplements during manufacturing, packaging, labeling, and holding operations.[2]
In the United States, the term "prescription drug" is most commonly used, but they are also called Rx-only drugs or legend drugs, after the Federal and State laws which mandate that all such drugs bear a "legend" prohibiting sale without a prescription; though more complex legends have been used, on most original drug packaging today the legend simply says "Rx only".
Also, pharmacies operated by membership clubs, such as Costco and Sam's Club, by law must allow non-members to use their pharmacy services and must charge the same prices as to members.[citation needed]
Physicians may legally prescribe drugs for uses other than those specified in the FDA approval; this is known as off-label use. Drug companies may not promote or market drugs for off-label uses.
Large U.S. retailers that operate pharmacies and pharmacy chains use inexpensive generic drugs as a way to attract customers into stores. Several chains, including Walmart, Dillons, Target, and others, offer $4 monthly prescriptions on select generic drugs as a customer draw.[3]