The maximum dose of oil of tansy is given by most authorities as about eight minims.
Considering the small size of the dose required and the frequency with which it is used by women as an emmenagogue and abortifacient, it is surprising that we do not more often hear of poisoning resulting therefrom. I have watched the literature closely for reports of cases of this kind, but have seen only one reported by Dr. Leipziger1 of Burlington, Iowa.
From druggists I learn that it has a reputation among the laity as an emmenagogue and that it is used frequently by women and girls who suspect and wish to avoid pregnancy. The two cases which have come to my notice are very similar, and one of them I wish to report.
Both cases occurred in young, unmarried women who, not having menstruated as usual, suspected pregnancy. Later developments proved their
WHITEHILL NM. POISONING FROM OIL OF TANSY.. JAMA. 1906;XLVII(7):509. doi:10.1001/jama.1906.25210070042003b