I took Bactrim for 5 days for a UTI earlier this month and it wen...

I took Bactrim for 5 days for a UTI earlier this month and it went great, I felt fine and was very happy with it. Then, last week, for an unrelated preventive matter a doctor wanted me to take levaquin for a week before a minor elective surgery and I asked if I couldn't take Bactrim instead because it cost so much less. Well, did I ever get sick after the first pill. Chills, fever, headache, bloodshot eyes, rib pain and aches and pains all over, so weak I could barely make it to the bathroom, I thought I was going to die. I didn't connect it with the bactrim because I had tolerated it so well just a couple of weeks earlier. So, 3 days later when I felt somewhat better, I took another bactrim and the symptoms came back though not quite as bad. Be careful with this, just because you don't get side effects the first time you take it doesn't mean you might not get them in the future.