I have found taking Claritan or Zyrtec or their generics, causes a progressive tightening in the chest and wheezing with a little phlegm at the bottom of the right lung which is hard to cough up. I have read this can be a side effect of the allergy medicine. It gets worse on the tablets and slowly improves when off them. I have not been diagnosed with Asthma although as a child had bronchial spasms. My question is, if I can't take allergy tablets to stop itchy eyes, streaming nose and endless sneezing fits, what can I do to help with allergies?