I have read, although I don't have the reference to hand, that discontinuing after only a single dose is all right, but after two another medication is recommended as there is a risk of developing rebound osteoporosis. I don't know if the usual "natural" protocol would be sufficient after only two doses, but this might be all you would need. I'd have a good discussion with your doctor, or perhaps call the Royal Osteoporosis Society, or equivalent if you are not in the UK.
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