Meptin tablets: the usual adult dose is 50 µg (one tablet) once before bed or twice daily (in the morning and before bed) by the oral route. Meptin air: in general, for adults, inhale 2 puffs (20 mcg of active ingredient) at a time, and for children, inhale 1 puff (10 mcg of active ingredient) at a time. The dosage may be adjusted according to your disease, age, or symptoms. Strictly follow the instructed dosing schedule. The maximum dosage is restricted to 4 times daily (8 puffs for adults and 4 puffs for children).

To study the beta2-blocking activity of procaterol, a guinea pig tracheal test was performed. The trachea was excised from male guinea pigs. A spiral section of the trachea was prepared and suspended in a 30-ml tissue bath. The condition of the tracheal muscle was monitored by isometric recordings using force transducers. Phentolamine was added to the bath fluid 15 min before induction of contraction with the test compound to block alpha-adrenergic receptors. ED50 for procaterol was 11 nM.