[Calorigenic action of beta-sympathomimetics]

In experiments on narcotized rats it has been demonstrated that not only isoprenaline and orciprenaline but terbutaline, salbutamol and clenbuterol as well have calorigenic effects. The effectiveness is regressing considerably from isoprenaline over orciprenaline, salbutamol and terbutaline. Clenbuterol, too, has essentially weaker calorigenic effects than isoprenaline. The duration of calorigenic effects rise clearly from isoprenaline over orciprenaline, terbutaline, salbutamol and clenbuterol, while this effect is beginning more hesitatingly in the same order of these substances.