4. Agree to use, and to be able to comply with, Two medically acceptable contraceptive measures without interruption, 4 weeks before starting study drug throughout the entire duration study drug therapy (including doses interruptions) and for 2 months after the end of the study drug therapy even if she has amenorrhoea. This applies unless the subject commits to absolute and continuous abstinence confirmed on a monthly basis, to avoid pregnancy for the duration of study.