Beta blockers

Some of the beta blockers used to treat high blood pressure have also been approved by the Food and Drug Administration for the treatment of migraine headaches. Others that are not specifically approved for migraines may still be prescribed for this purpose.

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Because beta blockers affect blood pressure, be sure to tell your doctor if you have asthma, chronic obstructive pulmonary disease, congestive heart failure, heart block, low blood pressure, slow heart rate, impaired kidney function, diabetes, heart disease, liver or kidney disease, or thyroid problems. Be sure to tell your doctor about any other drugs you are taking, including over-the-counter medicines and herbal products. Also tell your doctor if you expect to get pregnant or if you are pregnant or breastfeeding.

Beta blockers may take a few weeks to be effective. Continue taking the drug exactly as instructed, even after the symptoms go away, and do not stop taking it without talking to your doctor first. When these drugs are abruptly stopped, patients may feel anxious, have rapid heart rates, and feel palpitations and chest pain.

Although side effects are difficult to predict, the most common side effects are:

• Sleep disturbances
• Nausea
• Dizziness
• Sexual dysfunction
• Cold hands and feet
• Slower heart rate (even during exercise)
• Fatigue

Call your doctor immediately if you develop a rash; difficulty breathing; fainting or severe dizziness; slow, fast, or irregular heartbeat; swelling of hands, feet, ankles, or lower legs; or any other symptoms that cause concern. Call, too, if any of your side effects change in intensity.