This might help. Taken from chemocare.com/chemotherapy/side-effects/rapid-heart-beat.aspx
Drugs that may be prescribed by your doctor
ACE inhibitors - work by opening or dilating your arteries. They will lower your blood pressure, and improve blood flow to your kidneys, and throughout your body
Antianxiety medications - if your increased heart rate is due to anxiety, your healthcare provider may prescribe an anti-anxiety medication, called an anxiolytic. These medications will help you relax.
Beta-blockers - can be used to slow down your heart rate, and improve blood flow through your body. You may take this drug if you have been diagnosed with irregular heartbeats, or high blood pressure.
Calcium channel blockers - may be given to treat chest pain, high blood pressure, or irregular heartbeats. Will slow your heart rate.
Digoxin - Slows down heart rate and makes it beat more effectively
Diuretics - prevents heart failure by making you urinate out extra fluid