Discovered in 1934, Chloroquine has long been used in the treatment or prevention of malaria. Basically, this anti-malaria medicine works by interfering with the growth of parasites in the red blood cells of the human body. It is worth noting that these parasites typically enter the body through the bite of a mosquito. As for Chloroquine’s side effects, they include muscle problems, loss of appetite, diarrhea, and skin rash. Furthermore, this medicine can cause serious side effects such as problems with vision, muscle damage, seizures, and low blood cell levels. However, Chloroquine appears to be safe for use during pregnancy, considering it has not been shown to have any harmful effects on the fetus when used for malarial prophylaxis.