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Single dose absorption profiles and bioavailability of two different salbutamol tablets.

In a single dose cross-over experiment in twelve healthy adults a comparison of the absorption profiles and the relative bioavailability was made between a new salbutamol containing tablet (preparation A = Salbutax) and a commercially available and accepted formulation as reference (preparation B), both containing 4 mg salbutamol. Salbutamol plasma concentrations were measured frequently during a period of 16 h post dosing. Maximum salbutamol plasma concentrations after intake of product A and product B on an empty stomach were reached after 2.3 +/- 0.9 (= mean +/- S.D.) and 2.4 +/- 1.1 h, respectively, and accounted for 14.3 +/- 2.5 and 12.8 +/- 2.6 micrograms X l-1, respectively. The differences were not found to be significant (p greater than 0.05). The areas under the plasma concentration-time curves (AUC0----16), as obtained after administration of tablet A and tablet B, accounted for 73.5 +/- 14.0 and 65.0 +/- 11.8 micrograms X l-1 X h, respectively, the difference being marginally significant (p = 0.05). This results in a relative bioavailability of 114.3 +/- 15.7% for the product A 4-mg tablets. It is concluded that both products can be considered as having comparable bioavailability.