Four successive solvent extracts of the whole plant Striga orobanchioi
des have been screened for antifertility activity in albino rats. Of t
hese the ethanolic extract was found to be most effective in causing s
ignificant anti-implantation activity. The antifertility activity was
reversible on withdrawal of treatment with the extract. The ethanolic
extract at 200 mg/kg showed estrogenic activity. Histological studies
of the uterus were carried out to confirm this estrogenic activity.