Bactrim ds 800.2x daily for cellulitis. how long before improvement. i'm on day 3. if i were to have an allergic reaction would i know by now.? ty

Treatment response: Usually for cellulitis we expect to see some improvement by day 3. The problem these days, is that germs are increasingly resistant to medications. If there's no response at all - then this needs re-evaluation. Bactrim has lost some effectiveness over the years - particularly against Strep species, which can cause cellulitis. The thing to note is 'allergy' can arise at anytime while on medication

Yes,: However, there are still chances of developing allergic reaction later, but would be small and mild as time goes by. Regarding improvement, it depends on site, size, general condition, drugs used, etc, in general, if no improvement after few days, the management plan should be revisited, best wishes