Has Coldex A been taken off the market?

I RECENTLY WENT TO MY PHARMACY WITH A SCRIPT FOR COLDEX A FOR MY SON.  THE PHARMACIST STATED THAT HE HAS NOT BEEN ABLE TO GET THIS MEDICATION AND HE BELIEVED THAT THE MEDICATION WAS POSSIBLY NO LONGER MADE.  IS THIS TRUE?  THIS MEDICATION ALWAYS WORKED WELL FOR MY SON, DO WE NOW HAVE TO FIND AN ALTERNATIVE?

THANK YOU,

K. FIESEL, CONROE, TEXAS