thanks for your query.
Generally Motilium does not interfere with the menstrual cycle.
However, any kind of sickness and stress could be the reason.
Anxiety, travelling, weight loss
, endocrine disturbance of the thryoid hormone or prolactin
hormone etc are reasons.Polycystic ovarian syndrome
and endometrial hyperplasia
are possible causes.
Consult your gynecologist for a diagnosis.