I took chloroquine for 3 years while I lived in Sierra Leone. Bad juju medicine. I tried to stop. I don't remember why but I remember I hated taking it. Also because I kept hearing that the malaria in West Africa was chloroquine resistant. Then a MD told me that, yes, it is not very effective against malaria, but it is 95% effective against cerebral malaria, which he explained, you really don't want to get. I ended up getting malaria 3 times and a fourth time I had the symptoms but the test came back negative and so they told me it was typhoid. A German MD told me later that typhoid's what they tell everyone when the don't know what the hell you have. I also contracted onchocerciasis which took 13 years to get fully out of my system.