Doxy 100
"Have been taking this med now for the past 8 days, for an acute sinusitis infection, and paid strict attention to the pharmacists instructions..... YOU MUST DRINK A FULL GLASS OF WATER after you've taken it.  Don't disregard these rules, or you will have severe side effects.   Otherwise I'm hoping this time, doxy will clear it up as I was on amoxy and that didn't. This infection keeps repeating because of two bouts of pneumonia, and I'm sure residual infection wasn't properly cleared up then.   This time I'm hoping with 10 days of the Doxy it will be so far so good.......BUT PAY ATTENTION TO THE FOOD AND DRINK ON THIS MED....."