Hi thanks for your question.
Primolut contains active ingredient norethisterone
,which is synthetic hormone similar to the naturally occurring sex hormone.
It is used in wide range of menstrual disorder
Yes primolut therapy is used to regulate the menstrual cycle.
It has many more uses like dysmenorrhoes (painful periods ) and menorrhgia (heavy irregular menstrual bleeding) and premenstrual syndrome
Hope I answered your question.