Estriol 1 mg is primarily prescribed as part of hormone replacement therapy for postmenopausal women. It is a weaker estrogen compared to estradiol and is mainly used to relieve urogenital symptoms such as vaginal dryness, burning, itching, painful intercourse, and urinary urgency that result from estrogen deficiency. Because of its localized effect on vaginal and urinary tissues, estriol is considered safer for these specific indications, with less systemic stimulation of the endometrium. In some cases, it may also be used to help prevent osteoporosis in women at risk, though stronger estrogens are usually preferred for systemic therapy. Despite its relatively mild profile, estriol still carries risks such as breast tenderness, nausea, headaches, and in rare cases, increased risk of breast cancer or blood clots, so medical supervision is essential. Overall, estriol 1 mg is valued for its ability to improve quality of life in postmenopausal women by targeting urogenital atrophy while minimizing systemic side effects.