Carvedilol (Coreg) belongs to a group of drugs called beta-blockers. Beta-blockers affect the heart and circulation (blood flow through arteries and veins).
Carvedilol is used to treat heart failure and hypertension (high blood pressure). It is also used after a heart attack that has caused your heart not to pump as well.
You should not take this medication if you are allergic to carvedilol, or if you have asthma, bronchitis, emphysema, severe liver disease, or a serious heart condition such as heart block, sick sinus syndrome, or slow heart rate (unless you have a pacemaker).
If you need surgery, tell the surgeon ahead of time that you are using carvedilol. You may need to stop using the medicine for a short time.
Do not stop taking carvedilol without first talking to your doctor. Stopping suddenly may make your condition worse.
Avoid drinking alcohol within 2 hours before or after taking extended-release carvedilol (Coreg CR). Also avoid taking medicines or other products that might contain alcohol. Alcohol may cause the carvedilol in Coreg CR to be released too quickly into the body.
If you are being treated for high blood pressure, keep using carvedilol even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medication for the rest of your life.
Get emergency medical help if you have any of these signs of an allergic reaction to carvedilol: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
- feeling like you might pass out;
- slow or uneven heartbeats;
- chest pain, dry cough, wheezing, chest tightness, trouble breathing;
- feeling short of breath, even with mild exertion;
- swelling, rapid weight gain;
- numbness or cold feeling in your hands and feet;
- loss of bladder control;
- pale skin, feeling light-headed, rapid heart rate, trouble concentrating;
- high blood sugar (increased thirst, increased urination, hunger, dry mouth, fruity breath odor, drowsiness, dry skin, blurred vision, weight loss); or
- severe skin reaction — fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain, followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Less serious carvedilol side effects may include:
- dizziness, drowsiness;
- nausea, vomiting, diarrhea;
- dry eyes;
- feeling weak or tired;
- joint pain;
- cough; or
- decreased sex drive, impotence, or difficulty having an orgasm.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.