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===Medicine Development===
New [[medicine]] goes through several stages of testing before it is made legal to use on [[patient]]spatients.
*Discovery - Thousands of [[chemical]]s are identified which could be used to treat a [[disease]]. Only some are found to be suitable.
*[[Preclinical Trial]]s - A potential [[medicine]] is tested on [[tissue]]s grown in a lab or on [[animal]]s to determine a [[Medicine|medicinal]] effect, before using it on [[human]]s.
*[[Clinical Trial]]s - A potential [[medicine]] is tested on [[human]]s to see if it is safe and if it works.
**Stage 1 - The potential [[medicine]] is tested in small [[dose]]s on healthy volunteers. This is done as a [[Double Blind Trial|double blind trial]] using a [[placebo]].
**Stage 2 - The potential [[medicine]] is tested on small numbers of [[patient]]s patients 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 patients 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.