No, it is not safe to continue taking these medicines together without a prescription. Novelon (a contraceptive pill) can interact with both of your other medications. It can increase thyroid-binding proteins in your body, which may lower the effectiveness of Eltroxin and require a dosage adjustment. Additionally, contraceptive pills can raise blood pressure, potentially counteracting the effects of your blood pressure medication, Amlovas LS. You must consult your doctor to have your thyroid levels (TSH) and blood pressure monitored, and to get a proper prescription to ensure this combination is safe for you.