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A 51-year-old female asked:

I have taken bactrim (sulfamethoxazole and trimethoprim) 800 ds twice a day for 10 days for cellulitis. how long after the last dose will this antibiotic stay in my system?

2 doctor answers7 doctors weighed in
Dr. Mazen Kherallah
Infectious Disease 35 years experience
2-3 days: The half life of the medication is about 10 hours and it should be completely eliminated from your body in about 2-3 days
Created for people with ongoing healthcare needs but benefits everyone.
Dr. Steven Brown
Hand Surgery 40 years experience
Half life 10 hrs: Level of Bactrim (sulfamethoxazole and trimethoprim) drops by half every 10 hours so approximately 2 to 3 days
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Feb 7, 2020

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