Clarithromycin
"I was prescribed clarithromycin for a sinus infection. I have been battling this for four weeks. And two prescriptions before this. I am on day three and feel only a little better. I have read it takes 4-5 days to feel better especially if you have had it awhile. The sinuses are hard to penetrate. I have had no stomach problems, I recommend probiotics. Nasty taste in my mouth...Gatorade helps a bit. I have also had fatigue and headache but I am unsure if this is due to the antibiotics or that my body has had it with medication. Hope this helps someone."