The set of original, highly lipophilic ultrashort acting beta-adrenoceptor antagonists containing N-phenylpiperazine fragment, labelled as 1–4, was in vitro screened for the activity against Staphylococcus aureus, Escherichia coli and Candida albicans, respectively. Following the minimum inhibitory concentration (MIC) assay by the microdilution method, all the tested mol...