Abstract
1 Activity of six β-adrenoceptor antagonists was studied on behavioural activity (delayed differentiation) in the monkey (Macaca mulatta). The drugs, three relatively lipophilic antagonists (propranolol, oxprenolol and metoprolol), and three relatively hydrophilic antagonists (acebutolol, atenolol and sotalol), were given by intraperitoneal injection (5 to 30 mg/kg).
2 With atenolol (25 to 30 mg/kg), total response time was increased, but there was no effect on the number of correct responses. With acebutolol (25 to 30 mg/kg), the number of correct responses was reduced, but there was no effect on total response time. With metoprolol (25 to 30 mg/kg), there was an increase in total response time and a decrease in the number of correct responses, and correct responses were decreased 4 h after injection over the whole dose range (5 to 30 mg/kg).
3 Some animals failed to respond or complete the task with 30 mg/kg oxprenolol, 25 mg/kg sotalol and 20 mg/kg propranolol. With 25 mg/kg oxprenolol, the total response time was increased and the number of correct responses was decreased. With 5-20 mg/kg sotalol, total response time was increased, but there was no effect on the number of correct responses. With 15 mg/kg of (±)-propranolol and its isomers, there were increases in total response time and decreases in correct responses.
4 The studies suggest that lipophilic antagonists, such as propranolol, oxprenolol and metoprolol, are likely to have, at least, effects on the central nervous system, while hydrophilic antagonists may modify the peripheral nervous system. In the dose-ranges studied, propranolol had the greatest, and atenolol and acebutolol had the least effects. Atenolol and acebutolol may prove to be particularly useful in man when disturbances of the nervous system are to be avoided.
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