There has recently been a surge of interest in drugs that maintain calcium levels in bones. These drugs are not always effective and need to be taken continuously if any effect is to be maintained. They are often prescribed together with hormone replacement therapy . Complementary measures should be tried before resorting to either of these drugs.
More recendy a drug apparently capable of reforming, as opposed to maintaining, bone density has been marketed. Alendronic acid is only recently marketed and its long-term effects are poorly known. Like any new drug, I strongly advise against its use, especially as alternatives exist. Didronel has been around longer. It has recently been licensed for osteoporosis despite a lengthy list of side effects.