Buy Diane 35 medicine is an estrogen and progestin combination used to prevent pregnancy. It may also be used to regulate the menstrual cycle, treat symptoms of menopause, or treat other conditions as determined by your doctor.try to take this medicine at the same time every day, not more than 24 hours apart. store this medicine at room temperature, away from heat and light. if you miss a dose of this medicine, take it as soon as you remember. Take your next dose at the regular time. This means you may take 2 doses on the same day. if you miss more than 1 dose of this medicine, refer to the patient information that came with this medicine.