By the way Benadryl contains the H1 antihistamine diphenhydramine. If that isn't working, adding another proprietary H1 blocker, such as Clartyne or Zyrtec, doesn't work,as those receptors are already being acted on by the diphenhydramine. Zyrtec etc are just longer acting formulations, molecules that do the same job as Benadryl but stick around longer and have the advantage that they cause less drowsiness as they are not as neurologically active.
As Polarbear said, always see your doctor if you have concerns or recurrent symptoms. Allergies are a very tricky beast as Howler karma will remind you. And they can change for better or for worse over time.
Last edited by ndw; 09/26/14 04:19 PM. Reason: Left out words
