<prompt> In osteoporosis, bone formation is increased by which drug -BisphosphonatesEstrogenCalcitoninTeriparatide  <response>: Ans. is opl i.e Teriparatide Drug used in osteoporosis Inhibit resorption Bisphosphonates, donesumab, cinacalcet, calcitonin, estrogen, SERMS, gallium nitrate. Stimulate formation :-Teriparatide, calcium, calcitriol, fluorides. Both actions Strontium renelate. 