Zyrtec and albuterol

I'm glad my friend sent this link to me. My son was diagnosed with asthma almost two years ago. He was put on Singular and albuterol inhalers. He stayed with that for about a year. We didn't at the time have any health coverage and could no longer afford the Singular. We started giving him Zyrtec about three months ago. My son, he's 7, started going into these rages about this time last year and we had no clue as to why. We chalked it up to his age and being a boy. The raging has now stopped but he's still combative and lashes out easily physically. He's never been one to act violently before he was diagnosed with asthma. I'm now wondering if this is due to the medicine. After reading these posts we'll be taking him off the Zyrtec and trying something new.