Is there an alternative to Fosamax (alendronate) for paget's disease of bone?

Yes. There are several alternatives. Most commonly used is risedronate, formerly call actonel, was approved at a dose of 30 mg daily for 60 days.And proved to be very effective for 1-5 years. Recently, this was taken over by another company and the name was changed to atelvia. It, and another oral medication, skelid, (tiudronate) and the intravenous medication, reclast, (zoledronic acid) are chemically related to fosamax.
Yes. Reclast (zoledronic acid) given once a year IV in an excellent option. Speak to a rheumatologist. We treat several patients with Paget's disease in this manner.