Could mycosyst 150mg be taken when on your period?

Yes, Mycosyst 150mg can be taken during menstruation.

Mycosyst is a yeast infection treatment, if this is a vaginal yeast infection do bare in mind that you should not use tampons or commercial menstrual pads such as Always or Kotex - these options could make the infection worse, and while your vaginal flora is out of balance you're more susceptible to further vaginal infections and TSS.