Levofloxacin
"I'm 35 (female) and this medicine helped the bronchitis in 1st dose.  However, this is the 3rd night with extreme insomnia, dizziness and burst of energy and no appetite.  Feels like I've had an energy drink, great for the day but I toss and turn all night long. I'm lucky if I get 2 -3 hours of sleep! Oh yes my stomach sometimes feels queasy."