<p>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.<br />
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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.<br />
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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.</p>