Before taking this product, tell your doctor or pharmacist if you are allergic to atenolol or chlorthalidone; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using Tenoretic (Atenolol/Chlorthalidone) 100/25mg, tell your doctor or pharmacist your medical history, especially of: liver disease, kidney disease, certain types of heart rhythm problems (such as a slow heartbeat, second- or third-degree atrioventricular block), gout, lupus, breathing problems (such as asthma, chronic bronchitis, emphysema), blood circulation problems (such as Raynaud's disease, peripheral vascular disease), untreated mineral imbalance (such as low potassium), serious allergic reactions including those needing treatment with epinephrine, a certain muscle/nerve disease (myasthenia gravis).
Tenoretic (Atenolol/Chlorthalidone) 100/25mg may make you dizzy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.
Too much sweating, diarrhea, or vomiting may cause loss of too much body water (dehydration) and increase your risk of dizziness or lightheadedness. Report prolonged diarrhea or vomiting to your doctor. Be sure to drink enough fluids to prevent dehydration unless your doctor directs you otherwise.
Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Tenoretic (Atenolol/Chlorthalidone) 100/25mg may reduce the potassium levels in your blood. Ask your doctor about adding potassium to your diet. Your doctor may prescribe a potassium supplement.
If you have diabetes, this product may prevent the fast/pounding heartbeat you would usually feel when your blood sugar level falls too low (hypoglycemia). Other symptoms of low blood sugar, such as dizziness and sweating, are unaffected by Tenoretic (Atenolol/Chlorthalidone) 100/25mg. This product may also make it harder to control your blood sugar levels. Check your blood sugar levels regularly as directed by your doctor. Tell your doctor immediately if you have symptoms of high blood sugar such as increased thirst/urination. Your doctor may need to adjust your diabetes medication, exercise program, or diet.
Tenoretic (Atenolol/Chlorthalidone) 100/25mg may make you more sensitive to the sun. Avoid prolonged sun exposure, tanning booths, and sunlamps. Use a sunscreen and wear protective clothing when outdoors.
Older adults may be more sensitive to the side effects of Tenoretic (Atenolol/Chlorthalidone) 100/25mg, especially dizziness.
Tenoretic (Atenolol/Chlorthalidone) 100/25mg is not recommended for use during pregnancy. It may harm an unborn baby. Consult your doctor for more details.
Atenolol and chlorthalidone pass into breast milk. Atenolol may harm a nursing infant. Consult your doctor before breast-feeding.
Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.
Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.
Tenoretic (Atenolol/Chlorthalidone) 100/25mg is used to treat high blood pressure (hypertension). Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. This product contains 2 medications: atenolol and chlorthalidone. Atenolol belongs to a class of drugs known as beta blockers. It works by blocking the action of certain natural chemicals in your body, such as epinephrine, on the heart and blood vessels. This effect lowers the heart rate, blood pressure, and strain on the heart. Chlorthalidone is a "water pill" (diuretic) and causes your body to get rid of extra salt and water. This effect may increase the amount of urine you make when you first start the medication. It also helps to relax the blood vessels so that blood can flow more easily.
These medications are used together when 1 drug alone is not controlling your blood pressure. Your doctor may direct you to start taking the individual medications first, and then switch you over to this combination product if this is the best dose combination for you.
Take Tenoretic (Atenolol/Chlorthalidone) 100/25mg by mouth with or without food as directed by your doctor, usually once daily. If you take Tenoretic (Atenolol/Chlorthalidone) 100/25mg too close to bedtime, you may need to wake up to urinate. Therefore, it is best to take Tenoretic (Atenolol/Chlorthalidone) 100/25mg at least 4 hours before your bedtime. Consult your doctor or pharmacist if you have questions about your dosing schedule.
Apple juice and orange juice may prevent your body from fully absorbing atenolol. It is best to avoid drinking apple/orange juice within 4 hours of taking Tenoretic (Atenolol/Chlorthalidone) 100/25mg.
The dosage is based on your medical condition and response to treatment.
Use Tenoretic (Atenolol/Chlorthalidone) 100/25mg regularly to get the most benefit from it. To help you remember, take it at the same time each day.
If you also take certain drugs to lower your cholesterol (bile acid-binding resins such as cholestyramine or colestipol), take this product at least 2 hours before or at least 4 hours after these medications.
It may take several weeks before you get the full benefit of Tenoretic (Atenolol/Chlorthalidone) 100/25mg. It is important to continue taking Tenoretic (Atenolol/Chlorthalidone) 100/25mg even if you feel well. Most people with high blood pressure do not feel sick.
Tell your doctor if your condition does not improve or if it worsens (for example, your routine blood pressure readings remain high or increase).
See also Warning and Precautions sections.
Dizziness, lightheadedness, tiredness, nausea, and diarrhea may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
To reduce the risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.
This product may reduce blood flow to your hands and feet, causing them to feel cold. Smoking may worsen this effect. Dress warmly and avoid tobacco use.
Remember that your doctor has prescribed Tenoretic (Atenolol/Chlorthalidone) 100/25mg because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using Tenoretic (Atenolol/Chlorthalidone) 100/25mg do not have serious side effects.
The chlorthalidone in this product may cause a loss of too much body water (dehydration) and salt/minerals. Tell your doctor right away if you have any symptoms of dehydration or mineral loss, including: extreme thirst, very dry mouth, muscle cramps, weakness, fast/irregular heartbeat, confusion.
Tell your doctor right away if you have any serious side effects, including: very slow heartbeat, fainting, trouble breathing, change in the amount of urine (not including the normal increase in urine when you first start Tenoretic (Atenolol/Chlorthalidone) 100/25mg), toe/joint pain, mental/mood changes (such as depression, mood swings), blue fingers/toes, new or worsening symptoms of heart failure (such as swelling ankles/feet, severe tiredness, shortness of breath, unexplained/sudden weight gain).
A very serious allergic reaction to Tenoretic (Atenolol/Chlorthalidone) 100/25mg is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Click here to view a more detailed list of Tenoretic side effects.
If you miss a dose of Tenoretic (Atenolol/Chlorthalidone) 100/25mg, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Do not double the dose to catch up.
See also How to Use section.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
Some products that may interact with Tenoretic (Atenolol/Chlorthalidone) 100/25mg include: cisapride, fingolimod, lithium.
Check the labels on all your medicines (such as cough-and-cold products, diet aids, or NSAIDs such as ibuprofen, naproxen) because they may contain ingredients that could increase your blood pressure or heart rate. Ask your pharmacist for more details.
This product may interfere with certain laboratory tests (including parathyroid, protein-bound iodide), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use Tenoretic (Atenolol/Chlorthalidone) 100/25mg.
Do not stop taking Tenoretic (Atenolol/Chlorthalidone) 100/25mg without consulting your doctor. Some conditions may become worse when you suddenly stop Tenoretic (Atenolol/Chlorthalidone) 100/25mg. Some people who have suddenly stopped taking similar drugs have had chest pain, heart attack, and irregular heartbeat. If your doctor decides you should no longer use Tenoretic (Atenolol/Chlorthalidone) 100/25mg, he or she may direct you to gradually decrease your dose over 1 to 2 weeks.
When gradually stopping Tenoretic (Atenolol/Chlorthalidone) 100/25mg, it is recommended that you temporarily limit physical activity to decrease strain on the heart. Get medical help right away if you develop chest pain/tightness/pressure, chest pain spreading to the jaw/neck/arm, unusual sweating, trouble breathing, or fast/irregular heartbeat.