Concor is the brand name; the name of the medicine is bisoprolol. It belongs to the same class (called betablockers) as atenolol and has similar efficacy and side effects profile. Its side effects include postural hypotension (feeling of giddiness, vertigo, light-headedness) when a patient stands up after sitting/lying for a while. In young sexually active males enalapril (or lisinopril or ramipril) is preferable.