Hi, Deca Durabolin injection contains nandrolone that belongs to the group of medications known as steroids or corticosteroids is used in the treatment of osteoporosis in post menopausal women. It may be used to gain weight too. But, Deca Durabolin is not usually recommended to use for unauthorized uses due to a vast number of side effects like artificial weight gain that may be a result of water retention. This medication may affect the body metabolism and deposition of fat in the body. Deca Durabolin can increase someone s appetite, leading to extra deposits of fat in the abdomen and lead to weight gain. But without consulting your doctor, this medication should not be started for gaining weight. You can consult with dietitians in Chennai for gaining weight. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician