Q: Is it permissible for a woman to take anti-menstrual tablets so that she can perform the obligation of Hajj? If this is not allowed, is there anything else she can do?

A: There is nothing wrong if a woman takes contraceptive pills that prevent her from menstruating during the month of Ramadan or Hajj season in order to be able to fast and make Tawaf (circumambulation around the Ka`bah). There is nothing wrong with using any other means that prevents menstruation as long as it does not prove to be prohibited or hazardous.

[Fataawa Shaykh Ibn Baaz - Alifta.net]