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**Stage 2 - The potential [[medicine]] is tested on small numbers of [[patient]]s with the [[disease]]. This is done as a [[Double Blind Trial|double blind trial]] using a [[placebo]].
**Stage 3 - The potential [[medicine]] is tested on large numbers of [[patient]]s in different doses to find the [[optimum]] [[dose]].
*Licencing - The new [[medicine]] is reviewed for safety and if it passes the review can be prescribed by [[doctor]]s.