Important Warnings for Calan SR
Some Calan SR Warnings and PrecautionsSome warnings and precautions to be aware of with Calan SR include:
- Calan SR can slow down the heart rate. This can be a problem in people who have certain types of arrhythmias or people taking other medications that can slow down the heart rate.
- Calan SR should be used with caution in people who have congestive heart failure (CHF). Calan SR can cause fluid retention (edema) and can decrease the heart's ability to pump blood, which can be especially dangerous in people with CHF.
- If the left side of your heart is weak (called left ventricular dysfunction), you are at risk for heart failure and should use Calan SR with caution. Calan SR should not be combined with beta blockers in people who have left ventricular dysfunction.
- Calan SR can lower your blood pressure. Be sure to let your healthcare provider know if you have signs of low blood pressure, including dizziness, lightheadedness, or fainting.
- Calan SR can increase liver enzymes (diagnosed using a blood test), which may be a sign of liver damage.
- Calan SR can affect the electrical system of the heart, causing "heart block." This happens when signals from one part of the heart have trouble reaching the other parts. If this happens to you, your healthcare provider should lower your Calan SR dosage or take you off Calan SR altogether.
- Calan SR is metabolized and removed from the body using the liver and kidneys. If you have liver or kidney disease, Calan SR may accumulate in your body. Your healthcare provider should monitor you more closely and may need to decrease your Calan SR dosage.
- Calan SR can interrupt nerve signals to the muscles in people who have Duchenne's muscular dystrophy or myasthenia gravis.
- Calan SR can interact with a number of medicines (see Calan SR Drug Interactions).
- Calan SR is considered a pregnancy Category C medication. This means that Calan SR may not be safe to use during pregnancy. Talk to your healthcare provider about the risks and benefits of using Calan SR during pregnancy (see Verapamil and Pregnancy for more information).
- Calan SR does pass through breast milk. Therefore, if you are breastfeeding or plan to start breastfeeding, be sure to talk with your healthcare provider about using Calan SR (see Verapamil and Breastfeeding for more information).