THE EFFECTS OF ORAL AND PARENTERAL ADMINISTRATION OF A NEW SYNTHETIC ESTROGEN, BENZESTROL,1IN THE RAT1

Abstract
The synthetic estrogen benzestrol, 2,4-di(p-hydroxyphenyl)-3-ethyl hexane, was compared with natural estrogenic hormone at several dosage levels and by several routes of adm. in normal and castrate, young and adult rats, and in castrate adult [female] rabbits. A study of the physiologic. responses, and wt. and histologic. changes of essential organs, showed that the action of this synthetic compound was identical in all respects with that of natural estrogens, and that no "tox-icity" was observed from long continued overdosage. No evidence of malignant changes in any tissue was observed.