Anti-Toxoplasma Effects of Dracocephalum Polychaetum Essential Oil

Table 2

In vitro activity and selectivity of essential oil, sulfadiazine and pyrimethamine against Toxoplasma.

Tested drugs name	IC50		Selectivity index (SI)^a
	Vero	Vero + T.gondii
Essential oil	386.7	241.7	1.6
Sulfadiazine (positive control)	241.7	111.4	2.17
Pyrimethamine (positive control)	240.9	157.5	1.53

^arepresents the ratio of the IC50 value for Vero cells to the IC50 value for T. gondii RH strain.