pneumonia
"I was on a 10 day 500 mg prescription and could only make it through day 7 before requesting a change in my antibiotic. I had a wide range of side effect symptoms that left me hardly able to function. Severe muscle pain, especially in the back and lower leg (which I am still suffering from and hope the leg pain isn't tendon weakness which is also a side effect) horrible dizziness, nausea, insomnia, nightmares, and if I got too hot or too cold I had to immediately lie down. The dizziness was the worst, it felt like I had ridden a carnival ride for hours on end just turning my head. By day 7 my symptoms from pneumonia were only slightly better."