QTc prolongation in COVID‐19 may be medication induced or due to increased cytokine which can lead to stimulation of myocyte ion channels and inhabitation of enzyme CYP3A4 or due to abnormal electrolytes including hypokalemia or hypomagnesemia (Pornwattanakavee, Priksri, and Leelakanok 2021). Here, CYP3A4 is linked to familial primary hypomagnesemia.