@suzieqqqqq, hi.
the short slippery answer from me would be Forteo and Tymlos.
There are anabolics and antiresorptives.
Anabolics tymlos and forteo build bone by increasing the activity of cells that actually lay down bone.
Antiresorptives prevent the process of rebuilding bone by stopping the cells that break bone down. A process necessary for the remodeling process. Antiresorptives add bone density by accretion. So your bones are collecting older fissured bone. These drugs are all the bisphosphonates; Reclast, Alendronate, Fosamax. And Prolia which has a different mechanism for the same antiresorptive effect.
Finally there is Evenity which is considered to be anabolic initially and antiresorptive after several months of use.
The antiresorptives do prevent fractures. Bisphosphonates have been the only mainstay against fracture, until the advent of Forteo twenty plus years ago.
In my unschooled opinion Forteo is the finest pharmaceutical. It builds the best bone the fastest.
There are people who cannot tolerate Forteo. And others for whom Forteo is not a bone building medication. Which med builds bone depends on secondary causes, kidney function and immune status.