The route of administration is oral. The usual dose in adults is 200 mg once daily in the morning. In the case of an inadequate response the dose may be increased to 400 mg daily. It is important to take Selectol one hour before or two hours after food with a glass of water. If the treatment is to be discontinued, reduce the dosage gradually over a period of 1-2 weeks. In hypertensive patients, additional treatment with other anti-hypertensive agents according to clinical guidelines is possible, in particular with diuretics. When a combination is initiated an increased monitoring of the blood pressure is recommended.

In order to quantify the affinity constants and potential partial agonist properties of beta-adrenoceptor antagonists at beta1-and beta2-adrenoceptors, competitive experiments for binding of [125I]-iodocyanopindolol (specific activity 2000 Cimmol-1) to beta-adrenoceptors were performed. Specific binding was defined as the difference in binding in the absence and in the presence of propranolol (3 umol^-1). Celiprolol at increasing concentrations (0.0001-100 umol-1) was used for binding experiments with lung, and with myocardial tissue. The experiments were performed in the presence and absence of Gpp(NH)p to evaluate agonist properties of the beta-adrenoceptor antagonists by changing the agonist affinity state of the binding site in the presence of the metabolically stable guanine nucleotide.