Susten 400 Capsule is a female hormone used in the treatment of female infertility. This medicine helps boost the production of hormones involved in the ovulation process. Common side effects include flushing (reddening of the skin, especially the face), headache, Insomnia, tiredness, dizziness, breast pain or tenderness, heavy periods, etc. It is also used to restore the menstrual cycle in women who have missed their periods. This medicine is only intended for use in women. Hence should not be used in male population, pregnant/breastfeeding women, and children.