Pharmacokinetics of intravenous and oral salbutamol and its sulphate conjugate.

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Morgan DJ, Paull JD, Richmond BH, Wilson-Evered E, Ziccone SP

Pharmacokinetics of intravenous and oral salbutamol and its sulphate conjugate.

Br J Clin Pharmacol. 1986 Nov;22(5):587-93.

PubMed ID
3790406 [ View in PubMed
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Abstract

The pharmacokinetics of salbutamol and its sulphate conjugate metabolite were investigated after intravenous and steady-state oral administration of salbutamol to 10 healthy volunteers. With intravenous administration, total plasma clearance was 480 +/- 123 ml min-1, elimination half-life was 3.86 +/- 0.83 h and apparent volume of distribution was 156 +/- 381. Urinary excretion of unchanged drug and sulphate conjugate were 64.2 +/- 7.1% and 12.0 +/- 3.1% of the dose, respectively. With oral administration, systemic availability was 0.50 +/- 0.04, and urinary excretion of unchanged drug and sulphate conjugate were 31.8 +/- 1.9% and 48.2 +/- 7.3% of the dose, respectively. The drug eliminated on the first-pass could be accounted for entirely as sulphate conjugate formed, presumably, in the intestinal wall. Renal clearance of salbutamol was 291 +/- 70 ml min-1 after intravenous and 272 +/- 38 ml min-1 after oral administration, while the renal clearance of the sulphate conjugate was 98.5 +/- 23.5 ml min-1 after oral administration. Heart rate increased with increasing plasma salbutamol concentration, although a lag was evident. The effect on heart rate was lower after 24 h continuous oral salbutamol administration.

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