<unk> (tablet) is a beta-adrenergic blocker that is FDA approved for the treatment of hypertension, angina pectoris, heart failure. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include bradyarrhythmia, heart failure, hypotension, diarrhea, nausea, dizziness, fatigue, headache, depression, dyspnea, wheezing.
Metoprolol succinate 
Metoprolol tartrate 
Bisoprolol
Hydralazine 
Endralazine
Captopril
Diltiazem 
Carvedilol