A member asked:

Was prescribed bactrim ds for 7 days, take 2 800mg doses a day. i split the dosage over 14 days and took 1 800mg pill a day. finished bactrim on thursday, today is saturday and i just noticed a decent sized bruise on back of thigh. should i consult my doc

3 doctors weighed in across 2 answers

Unclear: It is hard to tie these things together. Bactrim (sulfamethoxazole and trimethoprim) can occasionally lower platelet counts which would make it easier to bruise. But if there is just one bruise and you are off the medication you might watch and see. If you continue to have bruising problems, have any bleeding, or are still concerned then see your doctor.

Answered 5/24/2015

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Dr. Robert Grindstaff answered

Specializes in Addiction Medicine

Yes: There can be several blood related side effects with Bactrim (sulfamethoxazole and trimethoprim) so I would see your physician to be sure

Answered 9/20/2014

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