You will have been prescribed calcitriol because you have either a bone disease called renal osteodystrophy or because you have postmenopausal 'thinning' of the bones (osteoporosis). In both these conditions, calcitriol will help your body to absorb the minerals it needs and this will help to strengthen your bones.
This is a companion discussion topic for the original article at https://patient.info/medicine/calcitriol-capsules-rocaltrol