Drugs are a chemical substance used to treat, cure, prevent, diagnose a disease or promote well-being. The drugs are introduced into the market after pre-clinical and clinical trials studies. Pre-clinical studies are carried out in more than two species of experimental animals. Pre-clinical studies used to test the efficacy and possible toxic effects of the drugs. Clinical trials are carried out on healthy volunteers as well as diseased patients in order to safe-guard the health of society. After a series of quality control process only a drug can be released into market. In spite of these tests, some adverse effects of drugs appear after the drug is used in the general population. An adverse drug reaction (ADR) is defined any noxious or undesired effect of a drug that occurs at doses used for prophylaxis, diagnosis and treatment of the disease. Pharmacovigilance is a branch of pharmacological science relating to the collection, detection, evaluation, monitoring and prevention of adverse effects with pharmaceutical products. If the adverse effects are severe or the risks of using the drug outweigh the benefits, or if the drug is ineffective, either, the country or the drug company may itself voluntarily withdraw the drug from the market. This article collects the information about the banned drugs and reasons of their ban for the benefit of society.
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