I was just prescribed a 5-day course of Zithromax Z-Pak for Strep...

I was just prescribed a 5-day course of Zithromax Z-Pak for Strep throat. Within hours, my throat started feeling better. Within 24 hours I was back on my feet;however, I was left with a terrible side effect --- silivia the consistency of foam --- yuck!!!!! The only relief I get from this is when I sleep. Hope it disappears after I finish the course - in 3 days. The last time I experienced this foam like saliva was during my 4 pregnancies. I know for a fact I'm not pregnant again. Has anyone experienced this problem after taking Z-Pak? If so, how did you get relief? Did it disappear after you finished the course?