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In page Cerebral vasospasm:

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Nimodipine, an oral calcium channel blocker, is the standard drug for the prevention of vasospasm following subarachnoid hemorrhage.[2] While it does not reverse vasospasm once it has occurred, it is effective in reducing the overall incidence. Early mobilization and rehabilitation have also been shown to significantly decrease the frequency and severity of vasospasm in some prospective interventional studies.[citation needed]