Zenten SR 300 Tablet contains 300 mg of natural micronized progesterone, a bioidentical hormone used primarily in hormone replacement therapy and the management of various gynecological conditions. Progesterone plays a critical role in regulating the menstrual cycle, supporting early pregnancy, and maintaining uterine health. The sustained-release formulation of Zenten SR 300 ensures a gradual and consistent release of progesterone, optimizing therapeutic efficacy and minimizing fluctuations in hormone levels. This medication is indicated for the treatment of progesterone deficiency states, including amenorrhea, dysfunctional uterine bleeding, and as part of assisted reproductive technology protocols to support luteal phase insufficiency. Additionally, it is utilized in hormone replacement therapy for menopausal women to counterbalance estrogen-induced endometrial hyperplasia. Zenten SR 300 should be administered under the guidance of a healthcare professional, with dosage and duration tailored to the individual patient’s clinical condition. Common side effects may include dizziness, headache, breast tenderness, and mild gastrointestinal disturbances. Contraindications include known hypersensitivity to progesterone, active thrombophlebitis, and certain hormone-sensitive malignancies. Regular monitoring is advised to assess therapeutic response and detect any adverse effects. This medication should be stored at room temperature, away from moisture and direct light.