Probably insignificant systemic exposure.

(To be edited, initial data ST OCT 04) Adrenergic selective beta-2-stimulator with long durationof effect, administered as inhalation powder (12 µg/dose) in bronchial asthma. About 90% of the dose may be swallowed and absorbed. Plasma cancentrations are below the detection limit. Eliminated after direct glucuronidation and 0-demetylation followed by glucuronidation.

Uneventful use reported in 4 patients with acute porphyria.