I just got a cat but found out im allgeric to it. I heard zyrtec (cetirizine) helps reduce allgeries is that true if not what does?

Good choice. Zyrtec is a good choice to help alleviate allergy symptoms. Other antihistamines such as claritin, allergra, and Benadryl (diphenhydramine) may help as well.
CAn be tough. Cat is one of the most common causes of indoor pet allergies. Cat allergy can cause allergy eyes, allergic nose symptoms and asthma. The treatment depends upon the symptoms being treated.