Provided is an inhibitor of the expression of a bone formation-related factor or a calcification-related factor in an extraskeletal tissue. An inhibitor of the expression of a bone formation-related factor in an extraskeletal tissue, the inhibitor being characterized by comprising phytic acid. The bone formation-related factor is any one of ALPL, RUNX2, BGLAP and the like. An inhibitor of the expression of a calcification-related factor in an extraskeletal tissue, the inhibitor being characterized by comprising phytic acid. The calcification-related factor is any one of SLC20A1, SLC20A2, ENPP1, ALPL, SPP1 and the like. These inhibitors can prevent heterotopic ossification and ectopic calcification, respectively, when administered intravenously.
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