sinusitis
"Two hours after the first dose, I had a pounding headache, severe nausea, dizziness/vertigo, a horrible, metallic taste in my mouth. Four hours later the taste has subsided. But headache is still a problem. If I move too quickly, the nausea returns.

On the plus side, the pain from the sinus infection is now tolerable (before it was excruciating). My sense of smell and taste has started to return. And I can breathe again, though this could be due to 2 other medications I was also prescribed (Otrivin and Acetylcystein Hexal). 

The last time I took antibiotics, I came down with an awful case of esophageal thrush, more painful that even a sinus infection, which took 1 1/2 months to resolve. So I am waiting to see what will happen."