Susten Capsules 100 mg Buy Susten Capsules 100 mg is used in the treatment of female infertility and hormone replacement therapy. Female infertility means when the female is not able to conceive even after 1 year of trying. If a woman keeps having miscarriages, it is also called infertility. OR Some women take hormone replacement therapy (HRT), also called menopausal hormone therapy, to relieve these symptoms. HRT may also protect against osteoporosis.