I am an RN recently retired with a Dexa scan of -2.9... started on Boniva February 1,2018... 2nd pill 3/01/2018 and last night 3/02/2018 I was in (and am in) so much pain I was in tears. I can barely get myself to the bathroom. Today I find out that this back and rib pain is a side effect (rare) of Boniva... OMG I read the literature and NEVER expected rare side effect... come to find out this side effect is NOT that rare, per my pharmacist. I will be reviewing this program and have cancelled the Boniva order.