The biggest concern is a possible negative reaction with the antibiotic Z-Pak her father was already taking.
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There’s supposed to be another antibiotic to use without the potential heart problems.
Doxycycline, a well-understood and in some cases safer antiobiotic, is what is prescribed to use with HCQ, if there are cardiac or drug interaction problems with Zpack.
Its true that zpack can sometimes cause a heart arrhythmia which is why my Mom cant take zpack..she had the same reaction when she took Cipro..but as far as hydroxy there is no issues with the heart