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A member asked:

I am doing genetic testing for lqts. is it safe for my daughter to take sulfamethoxazole for a uti? i have seen conflicting reports online.

A doctor has provided 1 answer
Dr. Melissa Gowans answered

Specializes in Pediatrics

Very low risk: "Through the many years of trimethoprim-sulfamethoxazole use, only two cases of QT prolongation were identified through a MEDLINE search.Certainly if an association exists with trimethoprim-sulfamethoxazole prolonging the QT interval, the risk is low.Trimethoprim-sulfamethoxazole probably does inhibit a rare type of IKr channel, which was implicated in one published case of prolonged QT interval"

Answered 2/27/2015

3.2k views

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