sinusitis
"After suffering from a cold for 8 days, I woke up with extreme pressure in my sinuses and couldn't hear due to my ears being clogged.  I was prescribed  the 3 day Zithromax and after one day felt sooo much better.  The pressure went away and I had a slightly runny nose. One the second day I could breathe without using decongestants.  I haven't had any side effects, but maybe a slight pang in my stomache when taking (I usually eat something right after taking).  I'm usually resistant to going to the dr. but very glad I did this time."