Non-CYP dependent metabolism. Two references consider it (probably) safe. Report of safe use. Porphyrinogenic in rat model.

(To be edited, initial data ST OCT 04) Aminosteroide muscle relaxant used in surgery and during orthopedic measures. Partly metabolized in the liver, partly excreted in unchanged form. South African list: use with care. French list: authorized Famewo (6 mg i.v.) PMID 3986654: safe

Uneventful use reported in 1 patient with acute porphyria.