Pregnancy-induced hypertension (PIH) and gestational diabetes mellitus (GDM) do not cause any problems with recognition; however, their pathophysiologies are still not explained. Yet many authors suggest that adrenergic β-1 receptor (ADRB1) plays a crucial role. The aim of this study was to evaluate the transcription activity of ADRB1 by using real-time polymerase chain reaction (PCR) in placenta from normal pregnancies and from PIH and GDM. Obtained findings demonstrated a significant increase in ADRB1 mRNA expression in the examined groups in comparison to the control (p = 0.03). Our data indicate a potential perspective of ADRB1 suppression gene therapy in the treatment of PIH and GDM.