Concentration-effect and time-effect relationships of carteolol.

The concentration-beta blocking effect and time-effect relationships of carteolol were examined in eight normal adults given 15 mg i.v. and 20 mg orally on separate occasions. Resting and post-exercise blood pressures and heart rates were assessed before and at various times up to 48 h after each dose. Carteolol, a beta-blocker with some partial agonist activity, produced an insignificant, transient increase in heart rate 2 to 6 h after both doses, and a fall (p less than 0.05) in diastolic blood pressure 4 and 6 h after the intravenous dose and 6 h after the oral dose in the resting supine position, as compared to the corresponding baseline values. All values of the post-exercise heart rate and the double product after each of the doses were significantly (p less than 0.001) below the baseline values for the entire period (48 h) of observation. A significant correlation between the log plasma carteolol concentration (log C) and its beta-blocking effect (E: p less than 0.001, r = 0.508 i.v.; p less than 0.001, r = 0.626, p.o.) was found. The r-values for individuals were higher (0.852 to 0.977, intravenous; 0.817 to 0.981, oral) than for the group as a whole. The slope (m) of the relationship, E = m X log C + r, showed a certain variance within and between individuals.(ABSTRACT TRUNCATED AT 250 WORDS)