Amenorrhea (the absence of periods) for a year is a symptom that requires professional evaluation, and there are no safe or effective over-the-counter (OTC) medications to treat it. Amenorrhea can be caused by various factors, including hormonal imbalances (like thyroid issues or polycystic ovary syndrome), stress, extreme weight changes, or excessive exercise. To treat this safely and effectively, it is important to find the underlying cause. Please consult a gynecologist or primary care physician. They can perform simple tests, such as blood work, to determine the exact cause and recommend the appropriate, safe treatment plan for you.