Denfos from Dr. Reddy's contains Alendronic Acid
Below are some of the details of Alendronic Acid(generic)
Alendronic acid or alendronate sodium is a bisphosphonate drug used for osteoporosis and several other bone diseases. It is marketed alone as well as in combination with vitamin D (2,800 U and 5600 U, under the name Fosamax+D).
Prophylaxis and treatment of female osteoporosis
Treatment of male osteoporosis
Prevention and treatment of corticosteroid-associated osteoporosis together with supplements of calcium and vitamin D