(Boehringer Ingelheim) Ventipulmin Syrup is indicated for the management of horses affected with airway obstruction, such as occurs in chronic obstructive pulmonary disease (COPD). Each ml of Ventipulmin Syrup contains 72.5 mcg clenbuterol HCl. Ventipulmin Syrup is administered orally twice per day. The initial recommended dose of Ventipulmin Syrup is 0.5 ml per 100 lbs twice daily for 3 days. If no improvement, increase dosage per label instructions, up to 2.0 ml per 100 lbs twice daily. The recommended duration of treatment at effective dose is 30 days. The effect of Ventipulmin Syrup on reproduction in breeding stallions and brood mares has not been determined. Clenbuterol HCl.