FIBRACILLIN is a semisynthetic antibacterial agent.

Faropenem medoxomil is an ester prodrug derivative of the beta-lactam antibiotic faropenem. The prodrug form of faropenem offers dramatically improved oral bioavailability and leads to higher systemic concentrations of the drug. Faropenem medoxomil is a broad-spectrum antibiotic that is highly resistant to beta-lactamase degradation. It was under development for the treatment of acute bacterial sinusitis, community-acquired pneumonia, acute exacerbation of chronic bronchitis, and uncomplicated skin and skin structure infections.

FLEROBUTEROL is a beta-adrenoceptor agonist with potential antidepressant activity.

Tienoxolol is a benzoic acid derivative patented by Centre d'Activite et de Recherche Pharmaceutique Industrielle Biologique et Medicale as β-sympatholytic and diuretic. Tienoxolol acts as a beta-adrenergic receptor antagonist shows potent diuretic and natriuretic activity and, besides that anti-hypertension activity in preclinical models. In clinical trials, Tienoxolol significantly and dose-dependently reduced exercise-induced tachycardia. This effect started 1 h after drug administration, peaked between 4 h and 6 h and lasted at least 12 h.

Flusoxolol (Ro 31-1411), a pharmacologically active optical isomer of Ro 31-1118 is a cardioselective beta-adrenoceptor antagonist. Flusoxolol was studied for the treatment of patients with ischemic heart disorders; however, the further development of the drug has been discontinued.

Fomidacillin (also known as BRL 36650) is a type of penicillin with antibacterial activity. Studies on volunteers have shown that the drug possessed the bactericidal activity and could be a candidate for the treatment of gram-negative bacillary infections. However, information about the further development of this drug is not available.

AstraZeneca R&D Charnwood (formerly Astra Charnwood, a subsidiary of AstraZeneca) was developing sibenadet (Viozan, AR-C68397AA) for the potential treatment of chronic obstructive pulmonary disease and asthma. Sibenadet is a dual D2 dopamine receptor, beta2-adrenoceptor agonist that combines bronchodilator activity with the sensory afferent modulating effects associated with D2-receptor agonism. Development of sibenadet has been discontinued due to disappointing efficacy findings.

Nifenalol is the beta-receptor antagonist. It has optical isomers. The racemic mixture and the levo-isomer are active in antagonizing beta-receptors, but the dextro-isomer is inactive. The levo-isomer seems to be about twice as active in blocking beta-receptors as the racemate. Nifenalol is virtually devoid of local anesthetic properties in contrast to procaine, propranolol, and butidrine. Nifenalol exacerbated the fighting behavior in male mice by foot-shock. Nifenalol has been studied in patients with coronary artery disease. It afforded the coronary patient good protection against angina and ischemic changes in the EKG. It was further noted that nifenalol had no antiarrhythmic action and that it was devoid of evident side effects. Nifenalol possessed weak action against tremorine and oxotremorine induced tremor.

Pafenolol is a beta 1 selective adrenoceptor blocker that was studied in phase I clinical trial in Sweden for the treatment of arrhythmia. However, this study was discontinued.