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Before taking atenolol and chlorthalidone, tell your doctor if you are using any of the following drugs:

other blood pressure medications, especially clonidine (Catapres), amlodipine (Norvasc), diltiazem (Tiazac, Cartia, Cardizem), felodipine (Plendil), nicardipine (Cardene), nifedipine (Procardia, Adalat), nimodipine (Nimotop), nisoldipine (Sular), reserpine (Serpasil), or verapamil (Calan, Covera, Isoptin, Verelan);digoxin (digitalis, Lanoxin, Lanoxicaps);dobutamine (Dobutrex);indomethacin (Indocin);isoproterenol (Isuprel Mistometer);lithium (Eskalith, Lithobid);a diabetes medication such as insulin, glyburide (Diabeta, Micronase, Glynase), glipizide (Glucotrol), chlorpropamide (Diabinese), or metformin (Glucophage);a diuretic (water pill) such as chlorothiazide (Diuril), hydrochlorothiazide (HCTZ, HydroDiuril, Hyzaar, Lopressor, Vasoretic, Zestoretic), chlorthalidone (Hygroton, Thalitone), indapamide (Lozol), metolazone (Mykrox, Zaroxolyn), and others; or steroid medications (prednisone and others).

This list is not complete and there may be other drugs that can interact with atenolol and chlorthalidone. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.

Do not use this medication if you are allergic to atenlolol (Tenormin) or chlorthalidone (Hygroton, Thalitone), or if you have:a heart problem such as heart block, or slow heart rate;if you are unable to urinate; orif you are allergic to sulfa drugs (such as Bactrim, Septra, and others).

Before taking this atenolol and chlorthalidone, tell your doctor if you are allergic to any drugs, or if you have:

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

If you have any of these conditions, you may need a dose adjustment or special tests to safely take this medication.

FDA pregnancy category D. This medication can cause harm to an unborn baby. Do not use atenolol and chlorthalidone without your doctor’s consent if you are pregnant. Tell your doctor if you become pregnant during treatment. Use an effective form of birth control while you are using this medication.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.

Take this medication exactly as it was prescribed for you. Do not take the medication in larger amounts, or take it for longer than recommended by your doctor. Follow the directions on your prescription label.

Atenolol and chlorhtalidone 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 medication even if you feel fine. High blood pressure often has no symptoms. You may need to use blood pressure medication for the rest of your life.

To be sure this medication is not causing harmful effects, your blood and blood pressure will need to be tested on a regular basis. Do not miss any scheduled appointments.

If you need to have any type of 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.

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

Do not stop taking atenolol and chlorthalidone without the advice of your doctor. Stopping suddenly may make your condition worse or cause withdrawal symptoms.

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 atenolol and chlorthalidone at room temperature away from moisture, heat, and light.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.Call your doctor at once if you have any of these serious side effects:chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling;slow or uneven heartbeats;feeling light-headed, fainting;feeling short of breath, even with mild exertion;swelling, rapid weight gain;dry mouth, increased thirst, drowsiness, restless feeling, confusion, nausea, vomiting, decreased urination, muscle pain or weakness, fast heart rate, feeling light-headed, fainting; nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);easy bruising or bleeding, unusual weakness;confusion, hallucinations; orcold feeling in your hands and feet.

Less serious side effects may include:

dizziness, tired feeling, depressed mood; dreaming more than usual;mild nausea, diarrhea, constipation, loss of appetite;headache, blurred vision, dry eyes;skin rash, itching; orimpotence, loss of interest in sex, or trouble having an orgasm.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.