NORINYL-1 is a combination oral contraceptive pill that is used to prevent pregnancy. It contains two types of hormones, mestranol (a form of estrogen) and norethindrone (a form of progestin), which work together to inhibit ovulation, alter the cervical mucus to prevent sperm from reaching the egg, and change the lining of the uterus to prevent attachment of a fertilized egg. By doing so, NORINYL-1 provides an effective method of birth control when taken as directed. It is typically taken once daily, with adherence to the prescribed schedule being crucial for maintaining its contraceptive efficacy. Like all medications, it may have side effects and is not suitable for everyone, so it's important to consult a healthcare provider to ensure it's the right choice for an individual's health needs and lifestyle.