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A member asked:
On day 4 of 250mg x2 daily of clarithromycin my qt and qtc have not changed at all. is this just a rare side effect that doesnt happen much?
A doctor has provided 1 answer
It happens: Claithromycin does prolong QT, definitively. However, it more often happens when people have cardiac abnormalities, have low serum potasisium or take more than one drug that prolongs QT. Prolonged QT is important because it is associated with more frequent arrhytmias. However, that the incidence of arrhythmias in response to clarithromycin is very low, less than 1 in 100,000 subjects.
Answered 7/8/2019
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