post meniscus tear surgery , i am taking the following medication and got strong itching sensation in several parts of my body , Zinnat500mg,Arcoxia 90mg,nexium 40mg,pradexa 75mg, paracetamol 1gm,Tramadol retard100mg. i am also regularly taking lipitor 10mg and Xatral for prostate. which medicine is causing this allergy?