In vivo antimalarial assay
Antimalarial activity of Tablet I, II and IIIwere evaluated using the Peter’s test methods (The 4-days suppressive
test). Each mouse was inoculated intraperitoneally on the first day (day 0) with 0.2 ml of infected blood containing
P. berghei parasitized erythrocytes (5% parasitemia). The animals were divided into four groups of five mice each
and administered orally with suspension of Tablet I, Tablet II and Tablet III containing andrographolide 12.55
mg/kg body weight twice a day and an equivalent volume of CMC-Na solutions (as negative control) at one day
after inoculation, for four consecutive days (day 0 to day 3). On the fifth day (day 4), thin films were made from the
tail blood of each mouse and the parasitemia level was determined by counting the number of parasitized
erythrocytes out of 1000 erythrocytes in random fields of the microscope. Average percentage parasite’s inhibition
was calculated as following