You're confusing HCQ with the antibiotic azithromycin that can cause heart arrhythmia that can cause heart attack.
Read my post above about a New York Doctor using doxycycline instead of Z-pac with great success and NO heart complications.
Doxycycline is a tetracycline antibiotic that fights bacteria in the body. Doxycycline is used to treat many different bacterial infections, such as acne, urinary tract infections, intestinal infections, respiratory infections, eye infections, gonorrhea, chlamydia, syphilis, periodontitis (gum disease), and others.
I am not wrong, here is a quote from Wikipedia on adverse reactions to hydroxychloroquine:
“The most common adverse effects are nausea, stomach cramps, and diarrhea. The most serious adverse effects affect the eye, with dose-related retinopathy as a concern even after hydroxychloroquine use is discontinued.[2] For short-term treatment of acute malaria, adverse effects can include abdominal cramps, diarrhea, heart problems, reduced appetite, headache, nausea and vomiting.”
Note that my mother’s doctor told her that among the heart problems it could cause or exacerbate is arrhythmia; having that pre-existing condition, she specifically asked.