No, your wife should not start taking Deviry 10 mg Tablet on her own to induce her period without first ruling out pregnancy. A missed period of 8 days could be due to pregnancy, stress, hormonal changes, weight changes, illness, or other medical conditions. If there is any possibility of pregnancy, she should take a home pregnancy test or consult a doctor before taking this medicine, as it should not be used during pregnancy unless specifically advised by a healthcare professional. If pregnancy has been ruled out, a doctor may prescribe Deviry 10 mg Tablet for certain conditions such as missed or irregular periods caused by hormonal imbalance. The dose and duration depend on the underlying cause and should be decided by a doctor. If her periods continue to be absent, are frequently irregular, or she has severe pain or heavy bleeding, she should seek medical evaluation to identify the cause and receive appropriate treatment.