Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

Less common

Breathing difficulty and/or wheezing; cold hands and feet; mental depression; shortness of breath; slow heartbeat (especially less than 50 beats per minute); swelling of ankles, feet, and/or lower legs

Rare

Back pain or joint pain; chest pain; confusion (especially in elderly patients); dark urine—for acebutolol, bisoprolol, or labetalol; dizziness or lightheadedness when getting up from a lying or sitting position; fever and sore throat; hallucinations (seeing, hearing, or feeling things that are not there); irregular heartbeat; red, scaling, or crusted skin; skin rash; unusual bleeding and bruising; yellow eyes or skin—for acebutolol, bisoprolol, or labetalol

Signs and symptoms of overdose (in the order in which they may occur)

Slow heartbeat; dizziness (severe) or fainting; fast or irregular heartbeat; difficulty in breathing; bluish-colored fingernails or palms of hands; convulsions (seizures)

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

More common

Decreased sexual ability; dizziness or lightheadedness; drowsiness (slight); trouble in sleeping; unusual tiredness or weakness

Less common or rare

Anxiety and/or nervousness; changes in taste—for labetalol only; constipation; diarrhea; dry, sore eyes; frequent urination—for acebutolol and carteolol only; itching of skin; nausea or vomiting; nightmares and vivid dreams; numbness and/or tingling of fingers and/or toes; numbness and/or tingling of skin, especially on scalp—for labetalol only; stomach discomfort; stuffy nose

Although not all of the side effects listed above have been reported for all of these medicines, they have been reported for at least one of them. Since all of the beta-adrenergic blocking agents are very similar, any of the above side effects may occur with any of these medicines. However, they may be more or less common with some agents than with others.

After you have been taking a beta-blocker for a while, it may cause unpleasant or even harmful effects if you stop taking it too suddenly. After you stop taking this medicine or while you are gradually reducing the amount you are taking, check with your doctor right away if any of the following occur:

Chest pain; fast or irregular heartbeat; general feeling of discomfort or illness or weakness; headache; shortness of breath (sudden); sweating; trembling

For patients taking labetalol :

• You may notice a tingling feeling on your scalp when you first begin to take labetalol. This is to be expected and usually goes away after you have been taking labetalol for a while.

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.