Zyrtec is what I take; my doctor had Rx'd Claritin in the past (a number of years ago) but it wasn't nearly as effective - for me -as the Zyrtec.

I hadn't heard of Singular, yet I will ask my doctor about it. If it won't conflict with my heart probs. or medication, I wouldn't mind trying it - to find out if it might work even better than the Zyrtec.