Malaria parasite over years have developed resistance to commonly used drugs, but that does not mean that orthodox medicine no longer works against malaria parasite.

Also most plants contain phytochemicals which have antimicrobial properties such phytochemicals like Alkaloids, tannin, saponin, and flavonoids, have been discovered to be of great importance in folklores medicine after been extracted either by aqueous means or by ethanolic means. However, like you said , dosage of such extract is what we should pay attention to.
This is a very good post, hope you are completely well now @gentleshaid