Treatment Time (min.) of cessation or drastic reduction in motility
Test concentrations
Extract 4 mg/ml 2 mg/ml 1 mg/ml 0.4 mg/ml 0.2 mg/ml
V. sinaiticum Aqueous 60* 70** NE NE NE
  Methanol 50* 80* NE NE NE
Positive control Diminazine aceturate 20* 30* 60* NE NE
Negative control 2 % Tween 80 in PBSG NE        
Table 3: In vitro antitrypanosomal effect of the aqueous and methanol leaf extracts of Verbascum sinaiticum on motility of Trypanosoma congolense.