sinusitis
"I took a 10 day dose 1 year ago for a sinus infection, and only remember feeling much better in a short time. Since I was already miserable, I don't remember having any adverse reactions.  Recently, I got a 7 day dose for another sinus infection and an ear infection, and I felt good on day 3 and 4 with only mild nausea and dizziness. Taking it on a full stomach helped.  I started to feel poor on day 5 and developed a terrible headache that lasted 2 days. By day 7, I developed severe fatigue, muscle, tendon and joint pain.  I agree with other reviews, in that this is a very effective medicine, but the side effects can be severe.  I am glad to hear that these go away in a few days."