I am a 57 years old on heavy bp medications ie Metoprol 50 mg twice daily, Acropol 20 mg twice daily, Adalat 20 mg once daily, Aspirin, Crestel 10 mg, 5 mg Folic acid, Hydrochlorothize waterpill 12.5 mg thyroid pil, eltroxixin 2.5 gms. My heart beat drops to 47. Is this dangerous level. I do feel dizzy.