Endothik 2 mg is a form of estrogen commonly used during infertility treatment to help build and maintain the uterine lining so that an embryo can implant properly, and it is generally safe and appropriate when prescribed by your doctor based on your specific treatment plan. Like any hormone medicine, it can cause mild side effects such as nausea, breast tenderness, or bloating, but serious problems are uncommon when taken under supervision. It is important to follow the exact dose and schedule, attend regular follow-ups, and not stop or change the medicine on your own, as timing is very important in fertility treatment. If you notice unusual symptoms like severe headache, leg swelling, or heavy bleeding, inform your doctor promptly.