amw1940, hi.
If I were 86 I'd take Forteo teriparatide. Both Prolia and Reclast can have some debilitating side effects. If I had to choose between Prolia and Reclast, I'd choose Reclast because of decreased immunity with Prolia that leaves everyone more susceptible to infections of all types but infections of the lung like pneumonia for those of us who have aged successfully. But also bladder infections. Since you can't take antibiotics without spiking liver enzymes Prolia could be a dangerous medication for you. Does your endo know about your situation with antibiotics?
Do you know your bone quality? Neither Prolia, nor Reclast are treatments for osteoarthritis. Forteo increases cartilage renewal, though it isn't prescribed for osteoarthritis either, but for osteoporosis.
Both Prolia and Reclast cause pain for almost everyone in the joints.
Forteo is a daily injection which some find difficult to give to themselves.
Reclast side effects can afflict you for a year or more.
Talk about side effects for both drugs and about infections with Prolia with your endocrinologist. Ask about Forteo. And then tell us what they say.
Best wishes