Karen, I just started Tapazole – will be 2 weeks this Wed. I was never a worrier – buy after reading your note had to laugh! I was worried all day today as to whether my throat feels funny from allergies or is it different. I suffer from allergies which lead to asthma if I don’t take care of them; so checked with 3 pharmacists yesterday as it was a Sat and all confirmed that I can take Chlortrimeton. Seemed to make my throat feel better so I am assuming that it’s post nasa drip! Good luck to you!