Hi Anna: Very interesting question. I'm not a Dr but I can lead you to some info regarding your question, that I hope will help.
When you say you have low calcium (hypocalcemia) do you mean that your total serum calcium score was below the reference range listed on the lab report?
Different labs will have different reference ranges, which is just another way of saying normal range. At my lab the reference/normal range is: any number between 8.6 and 10.2 mg/dL. Is your score below your labs lowest number listed in the reference range? The reason I ask is it's easy to misinterpret these scores. To get a dx of hypocalcemia you *usually* have to have more than one test result that is below 8.6 (or whatever your labs lowest number is in the range).
If you've had consistently low scores below the lowest number in the normal range then I would ask your Dr if he/she thinks the Boniva would be contraindicated for you. If the Dr feels that the additional calcium supplement will correct this, then just keep an eye on the score.
If you read the info from the manufacturer of Boniva, it say's that Boniva is contraindicated for those with *uncorrected* hypocalcemia. Since I don't know your actual score it's hard to say if you have a diagnosis of hypocalcemia or if your results are just at the low end of *normal* for the test.
Here's the link on Boniva that explains this issue with low calcium. Ask your Dr if it's ok to continue with this drug, if you do indeed have low calcium.
As far as the pain goes, this med can cause joint/bone/muscle pain. Have you had a recent injury to the area where the pain is, that might explain this? Whether you have or not, I would ask your Dr to check it out, since we don't know for sure if the med is causing the pain or not. Since the pain could originate from some other source, besides the med, then think about what type of testing might help to explain it--like an x-ray etc.
Good luck with this, and I hope your calcium isn't below the reference range, and if it is hopefully the additional calcium supplement will help bring the score up.