Ruling on preventing menstruation during hajj

Fatwa, posted 4.22.2010, from Saudi Arabia, in:
Religious Authority: 
Abdul-Aziz ibn Baaz
Fatwa Question or Essay Title: 
What is the ruling on the women using pills that prevent the monthly menstrual cycle during the days of hajj?
Websites and Institutions: 
Fatwa Islam, Internet Catalogue

There is no harm in that because it contains a benefit and a helpful advantage so that she can perform tawaf (one of the rituals of the hajj) with the people and so that she does not lose her group.