<prompt> Clomiphene citrate used in initial treatment for most anovulatory infertile women isSteroidal triphenylethylene derivativeGiven on 7th day to 10th day after onset of spontaneous mensesCan be administered if no follicle is 20mm and endometrium is 5mmIs oestrogen antagonist only  <response>: Clomiphene citrate is non-steroidal derivative given on 3rd to 5th day of cycle. It has both oestrogen agoinst and antagonist properties. 