hi,,thanks for the query
duphaston is dydrogesterone
useful in hrt,sec.amennorrhoea,infertility
,menstrual disorders etc..
oromone is estradiol an estrogen.. useful harmone for reproductive,genital organs and many systems
duphaston is always used for sec.amennorrhoea(no periods) only if oestrogen levels are normal or in combination with estrodiol..
you not having periods is not the cause ,it is a symptom of some inner problem mostly and not due to duphaston
so consult the gynaecologist ,and get totally investigated to diagnose the cause and get treated,,,
bye take care