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atenolol and chlorthalidone (cont.)

What should I discuss with my healthcare provider before taking atenolol and chlorthalidone (Tenoretic 100, Tenoretic 50)?

You should not use this medication if you are allergic to atenolol (Tenormin) or chlorthalidone (Hygroton, Thalitone), or if you have:

  • a serious heart problem such as heart block, or slow heart rate;
  • if you are unable to urinate; or
  • if you are allergic to sulfa drugs (such as Bactrim, Septra, Sulfatrim, SMX-TMP, and others).

To make sure you can safely take atenolol and chlorthalidone, tell your doctor if you have any of these other conditions:

  • congestive heart failure;
  • circulation problems;
  • angina (chest pain);
  • liver or kidney disease;
  • asthma, bronchitis, or other lung disorder;
  • diabetes;
  • gout;
  • lupus;
  • a thyroid disorder;
  • psoriasis; or
  • adrenal gland tumor (also called pheochromocytoma).

FDA pregnancy category D. Do not use atenolol and chlorthalidone if you are pregnant. It could harm the unborn baby. Use effective birth control, and tell your doctor if you become pregnant during treatment.

Atenolol and chlorthalidone can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.

How should I take atenolol and chlorthalidone (Tenoretic 100, Tenoretic 50)?

Take exactly as prescribed by your doctor. Do not take in larger or smaller amounts or for longer than recommended. Follow the directions on your prescription label.

Take this medicine with food if it upsets your stomach.

Atenolol and chlorthalidone is only part of a complete program of treatment for hypertension that may also include diet, exercise, and weight control. Follow your diet, medication, and exercise routines very closely if you are being treated for hypertension.

Keep using this medicine as directed, 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.

Your blood pressure will need to be checked often, and you may need other blood tests at your doctor's office. Visit your doctor regularly.

If you need surgery, tell the surgeon ahead of time that you are using atenolol and chlorthalidone. You may need to stop using the medicine for a short time.

Call your doctor if you have ongoing vomiting or diarrhea, or if you are sweating more than usual. You can easily become dehydrated while taking this medication, which can lead to severely low blood pressure or a serious electrolyte imbalance.

This medication can cause unusual results with certain medical tests. Tell any doctor who treats you that you are using atenolol and chlorthalidone.

Do not stop taking this medication without first talking to your doctor. Stopping suddenly may make your condition worse.

If you do stop taking this medication for any reason, limit your physical activity to prevent heart problems. Your doctor may recommend that you start taking the medication again if you have withdrawal symptoms.

Store at room temperature away from moisture, heat, and light.

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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