Pickup M E, May C S, Ssendagire R, Paterson J W
Br J Clin Pharmacol. 1976 Feb;3(1):123-34. doi: 10.1111/j.1365-2125.1976.tb00579.x.
1 Ephedrine plasma levels have been measured in ten asthmatic patients given a singel dose of ephedrine hydrochloride (22 mg) along and in combination with theophylline and a barbiturate. 2 Pharmacokinetic assessment of the data indicated no significant intra-subject changes in kinetic parameters before or after chronic treatment with ephedrine HCl (11 mg three times a day) alone or in combination. 3 Tolerance to these therapeutic doses, if it occurs, is therefore not disposition-related but rather to pharmacodynamic changes.
已对10名哮喘患者的麻黄碱血浆水平进行了测量,这些患者单独服用单剂量盐酸麻黄碱(22毫克),以及与茶碱和一种巴比妥酸盐联合服用。
对数据的药代动力学评估表明,单独或联合使用盐酸麻黄碱(每天3次,每次11毫克)进行慢性治疗前后,受试者体内的动力学参数没有显著变化。
因此,如果出现对这些治疗剂量的耐受性,并非与药物处置相关,而是与药效学变化有关。