Some people have allergic reactions to these drugs. On April 12, a preliminary clinical study at a hospital in Brazil was halted when several people who received high doses of chloroquine for COVID-19 infection developed an irregular heartbeat, resulting in 11 deaths.
Watu wengine hupatwa na athari za mizio kwa dawa hizi. Tarehe 12 Aprili, jaribio la kliniki lililofanyiwa uchunguzi kwanza lililofanyika katika hospitali nchini Brazili ulikomeshwa wakati watu kadhaa waliopewa kipimo cha juu cha chloroquine kwa ajili ya mmambukizo ya COVID-19 walikuwa na viwango vya mapigo ya moyo yasiyo ya kawaida, na kusababisha vifo vya watu 11.