Carvedilol may hide certain signs of hyperthyroidism. Do not stop carvedilol suddenly, as this can cause serious symptoms. Make sure to talk with your healthcare provider before stopping carvedilol so that it can be done so in a safe manner.
Carvedilol may cause extreme low blood pressure and/or a slow heart rate in some people. Symptoms can include dizziness, lightheadedness, and fainting. These symptoms may be more noticeable when going from a sitting or lying down position to standing. If you develop any of these symptoms, contact your healthcare provider. Extreme low blood pressure is more likely to occur in people who are taking a diuretic, are on dialysis, or have diarrhea or vomiting.
Make sure not to drive, operate any heavy machinery, or perform any other tasks that require alertness before you know how carvedilol affects you.
Using beta blockers, such as carvedilol, for a long period of time can, in some cases, lead to heart failure. Contact your healthcare provider if you notice:
When taking carvedilol for severe congestive heart failure, there is a risk of the condition becoming worse. This occurs more often when the dose is increased. Therefore, if your healthcare provider prescribes carvedilol because he or she believes that the benefits of the drug outweigh the potential risks, he or she may choose to monitor your situation more closely, especially during dosage changes. Contact your healthcare provider if you notice any symptoms of congestive heart failure.
People taking carvedilol should not stop abruptly. In clinical studies, this has been shown to increase a person's chances for developing angina (chest pain), heart attack, or serious irregular heart rhythms (arrhythmias). This risk is even greater in people with existing heart disease.
Beta blockers, including carvedilol, should be used with caution (if at all) in people with certain lung diseases, such as asthma, emphysema, chronic bronchitis, or chronic obstructive pulmonary disease (COPD). Beta blockers affect the lungs and can cause a narrowing of the airways. This risk is increased in people with certain lung diseases. If you develop problems breathing or wheezing while taking carvedilol, call your healthcare provider.
Carvedilol may cause low blood sugar in some people. In people with diabetes who have congestive heart failure, it may also increase blood sugar (see Coreg and Blood Sugar for more information).
Carvedilol has been known to cause a decrease in kidney function, especially in certain groups, such as those with severe congestive heart failure. Let your healthcare provider know if you experience a decrease in urine output, drowsiness, headache, or back pain.
For people with allergies, carvedilol may increase the reaction to the specific allergens, and your body may not respond to the usual doses of epinephrine.
Carvedilol may worsen symptoms in people with certain conditions that affect the circulation (known medically as peripheral vascular diseases).
If you are going to have surgery, let your healthcare provider or dentist know that you are taking carvedilol.
Carvedilol is a pregnancy Category C medicine, meaning that there may be an increased risk to the fetus. Let your healthcare provider know if you are pregnant or thinking of becoming pregnant while taking carvedilol (see Coreg and Pregnancy for more information).
If you are breastfeeding, carvedilol passes through your breast milk. Therefore, if you are taking carvedilol, it is generally recommended that you stop nursing. Talk to your healthcare provider about your particular situation.
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