Is there a better alternative to alendronic acid for an osteoporosis sufferer who has came off HRT?

Can you answer Frankie C’s question about Menopause?:

The health clinic advised coming off HRT,( which was by far the most effective treatment), due to recent carcinogenic effects, however the side effects of alendronic acid, which I am now on are horrendous. I am now quite desperate and looking for an answer to this question.

Estrogen Replacement Therapy