“May all be happy, may all be healed, may all be at peace and may no one ever suffer."
This solution for inhalation contains two active bronchodilating substances Salbutamoi Sulphate and Ipratropium Bromide. Salbutamoi Sulphate is a beta2-adrenergic agent which acts on airway smooth muscle resulting in relaxation. Salbutamoi relaxes all smooth muscle from the trachea to the terminal bronchioles and protects against all bronchoconstrictor challenges. Ipratropium Bromide is a quaternary ammonium compound with anticholinergic properties. In preclinical studies, it appears to inhibit vagally mediated reflexes by antagonising the action of acetylcholine, the transmitter agent released from the vagus nerve. Anticholinergics prevent the increase of intracellular concentration of cyclic guanosine monophosphate (cyclic GMP) caused by interaction of acetylcholine with muscarinic receptors on bronchial smooth muscle. The bronchodilation following inhalation of Ipratropium Bromide is primarily local and site specific to the lung and non systemic in nature. This provides simultaneous release of Ipratropium Bromide and Salbutamoi allowing synergistic efficacy on the muscarinic and beta2 adrenergic receptors in the airways to cause bronchodilation which is superior to that provided by each single agent and with no potentiation of adverse events.
Pharmacology
Ipratropium Bromide is quickly absorbed after inhalation. The systemic bioavailability following inhalation is estimated to be less than 10% of the dose. Renal excretion of Ipratropium Bromide is given as 46% of the dose after intravenous administration. The half-life of the terminal elimination phase is about 1.6 hours as determined after intravenous administration. Elimination half-life of drug and metabolites is 3.6 hours as determined after radio labelling. Ipratropium Bromide does not penetrate the blood brain barrier.
Salbutamoi Sulphate is rapidly and completely absorbed following administration either by inhaled or oral route. Peak plasma Salbutamoi concentrations are seen within three hours of administration and it is excreted unchanged in the urine after 24 hours. The elimination half-life is 4 hours. Salbutamoi will cross the blood brain barrier reaching concentrations amounting to about five percent of the plasma concentrations.
It has been shown that co-nebulisation of Ipratropium Bromide and Salbutamoi Sulphate does not potentiate the systemic absorption of either component and that therefore the additive activity of this solution is due to the combined local effect on the lung following inhalation.