I was given both fosomax and evista in the beginning but had severe side effects so discontinued both. This is, however, a legitimate protocal and since you have had no problem with the fosomax it probably wouldn't hurt to add the evista.
Since the fosmax isn't doing anything, you might also consider going another route, as many of us here have. There are many threads you could check out on this board about alternative modalities.
Peregrine
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Taking two medications at the same time 
Linear Mode
