I had s nuclear stress test today using Lexiscan. I did not respond well, I had tightness in the chest and right neck, pains in chest, numb face, the list goes on. The test was done at eleven am, it s now 9:30pm and I m still have the same problems, I was admmited into the cardiac ward shortly after the stress test. My question is: even though an allergy to this medicine is rare I evidently am allergic to it and want to know how long this reaction May last