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*[[Antihistamine]]s - They reduce the [[symptom]]s of [[Hay Fever|hay fever]].
===Drug Medicine Development===New [[medicine]] goes through several stages of testing before it is made legal to use on [[patient]]s.*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 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]].