Health Fruits and Foods

Now that Zyrtec is acquirable over the counter, I pay a lot more for it than I did w/ my co-pay for the prescription. Is there a prescription allergy medicine that is similar to Zyrtec?
Aidan takes Singulair too. DUH, why didn’t I think of that?!!! That’s a 1/3 of the price of what I’m paying for Zyrtec right now. Thank you!