- Understand that pharmacological research does not end when the drug is already on the market, as it is necessary to do a follow-up in order to assess the appearance of immediate effects.
A drug comes on the market when Phases I, II and III have been completed, which means, tosum up, that it has been tested on a limited group of people and that it has the permission of the corresponding health authority.
In the real world there are many more patients, and we must keep track of the possible effects of the drug. We must carry out the so-called phase IV, which aims to collect as much information as possible on the action of the drug.
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