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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Do You Suggest For Allergic Reaction To Bactrim?

I have had an allergic reaction to Bactrim itchy red rash. How long does it take to leave the bloodstream I finished the medication more than two weeks ago. The rash is very light looking but the itch is constant. I have taken Benedryl over the counter hasn t really helped. Should I go back to the physician?
Thu, 13 Mar 2014
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Infectious Diseases Specialist,  's  Response
Hello,
Welcome to HCM,

The bactrim is a combination of Trimethoprim and Sulfamethoxazole, it is known to cause itching in the person who are sensitive to products of sulphur group pf drugs.

This drug is eliminated from the body in 2-3 days, the half life of this drug is 8-10 hours and this drug is completely eliminated from the body by 48-72 hours.

As you have developed generalized hives for this drug you need to discontinue this drug and this drug is completely excreted from the body by 2 days after stopping the drugs.
For present symptoms you need to take oral antihistamines to control the symptoms.
Thank you.
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What Do You Suggest For Allergic Reaction To Bactrim?

Hello, Welcome to HCM, The bactrim is a combination of Trimethoprim and Sulfamethoxazole, it is known to cause itching in the person who are sensitive to products of sulphur group pf drugs. This drug is eliminated from the body in 2-3 days, the half life of this drug is 8-10 hours and this drug is completely eliminated from the body by 48-72 hours. As you have developed generalized hives for this drug you need to discontinue this drug and this drug is completely excreted from the body by 2 days after stopping the drugs. For present symptoms you need to take oral antihistamines to control the symptoms. Thank you.