Hydrogest DS is a sterile, oil-based injectable solution containing 500 mg of Hydroxyprogesterone Caproate per 2 ml. It is a synthetic progestin used primarily to prevent preterm birth in women with a prior history of spontaneous preterm delivery. It is also indicated for treating amenorrhea, abnormal uterine bleeding due to hormonal imbalance, and in the palliative care of certain hormone-sensitive cancers. The medication is administered intramuscularly once weekly and is known for its prolonged duration of action.