Hi Anne
I worry when I am able to answer so many posts!!! I am either a hypochondriac or ill!!!

I am on prednisolone, starting out on very high doses 23 years ago but for the last couple of years, maybe longer as I've lost track, I have dropped to a maintenance dose of 3mg. It is unlikely I will ever be able to come off them completely.
I am on Adcal D3. This is a combination tablet containing calcium carbonate and colecalciferol. It is used in RA patients to help prevent osteoporosis which can be caused by, usually long term, steroid use. It's a preventative medication rather than a treatment and if your doctor feels it is appropriate I would definitely take it, at least whilst you are taking the steroids. It isn't a drug as such so don't worry about taking it.
The Alendronic acid I'm not sure about. However the GP must have a reason for prescribing it so I would try it for now. Just watch out for side effects!
Hope you get a good response from Humira,
Lyn x