you need to contact your doctor again. he or she should be aware the foot swelling has returned. this could indicate the cellulitis has not been cured or that something else is going on. swelling of the feet is not a common side effect of bactrim. wishing you well!
is feet swelling a side effect of bactrim use. i just finished my 2nd round of bactrim. on my first round my two on my right foot were turning dark purple under the skin. his diagnosis was that i had cellulitis. one foot was cool to the touch and the other was very warm. he prescribed a 10 day regimen of bactrim to be taken orally twice a day. after the first round it seemed that the bactrim had done the trick and that it had worked. not so about a week later the same foot was swollen again. not sure what to make of it.