Essential medicines are those that satisfy the priority health care needs of a population. They are selected with due regard to disease prevalence and public health relevance, evidence of efficacy and safety and comparative cost-effectiveness. They are intended to be available in functioning health ...systems at all times, in appropriate dosage forms, of assured quality, and at prices individuals and health systems can afford.
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Journal of The Association of Physicians of India, Vol. 63 November 2015,, pp.77-96