The effect of some new β-phenylethylamine derivatives on some parameters of the lipid metabolism and lipid peroxidation was investigated. The research method used was based on inducing hyperlipidaemia in rats by administering orally 4% triton in a dose of 400 mg/kg bw. The new compounds were tested against fenofibrate, the reference substance. The results have shown that compounds coded C2 and A1 induced a decrease in the total cholesterol levels, that was higher than that generated by the reference substance, compared to the control group with hyperlipidaemia. Furthermore, compounds coded C2, A6 and C3 have lowered LDL-cholesterol levels more efficiently than fenofibrate, in the hyperlipidaemia control group. All compounds except for C1 increased HDL-cholesterol levels more than the reference substance in the hyperlipidaemia control group. All compounds lowered the malonyl dialdehyde liver concentration, as a biomarker of lipid peroxidation, compared to the hyperlipemic control group. According to our results, the newly synthesized β-phenylethylamine derivatives have a statistically significant positive impact on the parameters of the lipid metabolism, possibly due to a β 3-adrenergic receptors agonist mechanism. Rezumat A fost evaluat efectul unor compuși nou sintetizați cu nucleu beta-feniletilaminic asupra parametrilor metabolismului lipidic și asupra peroxidării lipidice. Metoda de cercetare folosită s-a bazat pe inducerea hiperlipemiei la șobolan prin administrarea orală a 400 mg/kg corp triton 4%. Compuși au fost administrați pe cale orală, comparativ cu fenofibratul, utilizat ca substanță de referință. Rezultatele au arătat că doi dintre compuși, notați C2 și A1 au determinat scăderi ale colesterolului total mai mari decât cele induse de fenofibrat la șobolanii hiperlipemici. Compușii C2, A6 și C3 au determinat scăderi ale LDL colesterolului mai mari decât cele induse de fenofibrat față de martorul hiperlipemic. Toate substanțele au determinat creșteri ale HDL colesterolului, respectiv scăderi ale trigliceridelor serice (cu excepția C1), mai mari decât cele induse de fenofibrat la șobolanii hiperlipemici. Toate substanțele au scăzut concentrația malonildialdehidei hepatice, ca marker al peroxidării lipidice, comparativ cu lotul martor hiperlipemic. Conform rezultatelor obținute, substanțele nou-sintetizate prezintă efecte benefice semnificative statistic asupra parametrilor metabolismului lipidic, posibil printr-un mecanism de tip agonist asupra receptorilor beta-3 adrenergici.