Yes available in the US but you must comply with the Clozaril Registry because the drug has a black box warning and potentially can reduce WBC to lethal level.

Initially must have CBC every week for six months, then CBC every two weeks for six months, then CBC every month thereafter as long as the drug is prescribed. Fortunately I am not needle phobic but it is a pain having to drive into town for the CBC and then wait for the results before I can get my Rx.