The average physician has some 50,000 drugs from which to choose when writing out a prescription. Few are able to make effective use of more than 100.
In many countries the proliferation of drugs results in prescriptions that read like a shopping list, and in many unnecessary "medicines" being sold. In 1982 the Bangladesh government reckoned that one third of the money spent on drugs was wasted on totally useless tonics, vitamins and other dubious preparations.