Tell your doctor if you are breast-feeding a baby. Atenolol is not approved for use by anyone younger than 18 years old. Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat. This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. Use Atenolol Tenormin exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.
Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended. If you need surgery, tell the surgeon ahead of time that you are using atenolol. You may need to stop using the medicine for a short time. It may take up to 2 weeks before you get the full effect of atenolol.
Keep using the medication as directed and tell your doctor if your symptoms do not improve. You should not stop taking atenolol suddenly.
Stopping suddenly may make your condition worse. If you are being treated for high blood pressure: Keep using this medicine even if you feel well. High blood pressure often has no symptoms.
You may need to use blood pressure medicine for the rest of your life. About atenolol Atenolol belongs to a group of medicines called beta blockers. This medicine is only available on prescription.
Help us improve our website Can you answer a quick question about your visit today? Atenolol slows down your heart rate and makes it easier for your heart to pump blood around your body.
It can make you feel dizzy, sick or tired, or give you constipation or diarrhoea. These side effects are usually mild and short-lived. Your very first dose of atenolol may make you feel dizzy, so take it at bedtime.
After that, if you do not feel dizzy, you can take it in the morning. Atenolol is known by the brand name Tenormin. Other brand names include Tenif for atenolol mixed with nifedipine and Co-tenidone atenolol mixed with chlortalidone. To make sure it's safe for you, tell your doctor before starting atenolol if you have: had an allergic reaction to atenolol or any other medicine in the past low blood pressure or a slow heart rate serious blood circulation problems in your limbs such as Raynaud's phenomenon , which may make your fingers and toes tingle or turn pale or blue metabolic acidosis - when there's too much acid in your blood lung disease or asthma Tell your doctor if you're trying to get pregnant, are already pregnant or breastfeeding.
You'll usually take atenolol once or twice a day. It's a good idea to leave 10 to 12 hours between doses if you can. Dosage How much you take depends on why you need atenolol. How to take it Atenolol does not usually upset your tummy, so you can take it with or without food. Swallow the tablets whole with a drink of water. What if I forget to take it? If you often forget doses, it may help to set an alarm to remind you. What if I take too much?
Side effects often improve as your body gets used to the medicine. Common side effects These common side effects happen in more than 1 in people. Talk to your doctor or pharmacist if these side effects bother you or last more than a few days: feeling sleepy, tired or dizzy cold fingers or toes feeling sick nausea diarrhoea constipation Serious side effects It happens rarely, but some people have serious side effects when taking atenolol.
Tell a doctor straight away if you have: shortness of breath with a cough that gets worse when you exercise like walking up stairs , swollen ankles or legs, chest pain, or an irregular heartbeat - these can be signs of heart problems trouble breathing, cold sweats and sudden, sharp chest pain that gets worse when you cough or take deep breaths - these can be signs of lung problems a fast heart rate, a high temperature, trembling and confusion - these can be signs of a thyroid problem Serious allergic reaction In rare cases, atenolol may cause a serious allergic reaction anaphylaxis.
Information: You can report any suspected side effect using the Yellow Card safety scheme. Visit Yellow Card for further information. What to do about: feeling sleepy, tired or dizzy - as your body gets used to atenolol, these side effects should wear off. If atenolol makes you feel dizzy, sit or lie down until you feel better. Do not drive or operate machinery until you feel OK again. Try to avoid alcohol as it'll make you feel worse.
Do not smoke or have drinks with caffeine in - this can make your blood vessels narrower and further restrict blood flow to your hands and feet. Try wearing mittens they're warmer than gloves and warm socks. Do not wear tight watches or bracelets. It might help to take your atenolol after a meal or snack. Signs of dehydration include peeing less than usual or having dark, strong-smelling pee. Do not take any other medicines to treat diarrhoea without speaking to a pharmacist or doctor.
Try to exercise more regularly by going for a daily walk, for example. If this does not help, talk to your pharmacist or doctor. Atenolol is not usually recommended in pregnancy.
Atenolol and breastfeeding If your doctor or health visitor says that your baby's healthy, it's OK to take atenolol while breastfeeding. They may recommend a different medicine for your blood pressure. Non-urgent advice: Tell your doctor if you're:. There are some medicines that may interfere with the way atenolol works.
Important: Medicine safety Tell your doctor or pharmacist if you're taking any other medicines, including herbal medicines, vitamins or supplements. How does atenolol work? Atenolol is a type of medicine called a beta blocker.
We do not fully understand how atenolol prevents migraines. How long does atenolol take to work? How long will I take it for? This depends on why you're taking atenolol.
Is it safe to take for a long time? Atenolol is generally safe to take for a long time. What will happen if I stop taking it? Talk to your doctor if you want to stop taking atenolol. Stopping atenolol suddenly may make your health problem worse. How does atenolol compare with other heart medicines? They work in a different way from beta blockers and include: ACE inhibitors - for example, ramipril and lisinopril angiotensin receptor blockers - for example, candesartan calcium channel blockers - for example, amlodipine diuretics medicines that make you pee more - for example, furosemide Beta blockers are not usually the first choice treatment for high blood pressure.
The medicine your doctor prescribes depends on your age and ethnicity. How does it compare with other medicines for preventing migraine?
Ask your doctor or pharmacist which medicine is best for you. Will I need to stop atenolol before surgery? Can I drink alcohol with it? Is there any food or drink I need to avoid? You can eat and drink normally while taking atenolol. Will it affect my contraception? Atenolol will not stop your contraception working. Talk to your doctor if you're taking a hormonal contraceptive. Will it affect my fertility? Will it affect my sex life? If you're having problems with your sex life, talk to your doctor.
Do I need to avoid playing sports? An interaction is when a substance changes the way a drug works. This can be harmful or prevent the drug from working well.
To help avoid interactions, your doctor should manage all of your medications carefully. Reserpine and monamine oxidase inhibitors MAOIs may increase or add to the effects of atenolol. They may also increase lightheadedness or slow your heart rate more. MAOIs can continue to interact with atenolol for up to 14 days after taking them.
Examples of MAOIs include:. Taking certain heart drugs with atenolol can slow down your heart rate too much. Examples of these drugs include:. Like atenolol, these drugs are used to treat high blood pressure and several other heart problems. If combined with atenolol, they may reduce the contractions of your heart and slow it down more. Doctors sometimes use this combination under close supervision. Alpha blockers lower blood pressure. They may decrease blood pressure too much when combined with atenolol.
Suddenly stopping the drug while also taking atenolol can cause a big jump in blood pressure. Taking indomethacin with atenolol can reduce the blood pressure-lowering effects of atenolol.
However, because drugs interact differently in each person, we can not guarantee that this information includes all possible interactions. Always speak with your healthcare provider about possible interactions with all prescription drugs, vitamins, herbs and supplements, and over-the-counter drugs that you are taking. Taking it again could be fatal cause death. A doctor may still prescribe it, but only in small doses with careful monitoring. Atenolol works to block beta receptors on cells in the heart.
But at higher doses, atenolol can block different types of beta receptors found in breathing passages. Blocking these receptors can lead to narrowing of breathing passages, making asthma or COPD worse. For people with diabetes: Atenolol may mask important signs of low blood sugar, including shaking and increased heart rate.
Without these signals, it becomes more difficult to recognize dangerously low blood sugar levels. For people with poor circulation: If you have poor circulation in your feet and hands, you may have worse symptoms when taking atenolol. Atenolol reduces blood pressure, so you might not get as much blood to your hands and feet. For people with an overactive thyroid hyperthyroidism : Atenolol may mask important signs of an overactive thyroid, including a fast heartbeat.
If you stop taking this drug suddenly, it may get worse and could be life threatening. For pregnant women: Atenolol is a category D pregnancy drug. That means two things:.
Atenolol use in the second trimester of pregnancy has been associated with birth of babies who are smaller than normal. Also, newborns of mothers who took atenolol at the time of birth may be at risk of hypoglycemia lower than normal blood sugar levels and bradycardia slower than normal heartbeat.
If you take atenolol and are considering having a baby, or if you are pregnant, talk to your doctor right away. Atenolol is not the only medication that treats high blood pressure. Other drugs have fewer adverse effects during pregnancy and breastfeeding. Your doctor will be able to tell you if a different drug or a dose adjustment is an option for you. For women who are breastfeeding: Atenolol is absorbed into breast milk and could be passed to a child who is breastfed. Newborns who breastfeed from mothers who take atenolol are also at risk of hypoglycemia and bradycardia.
All possible dosages and drug forms may not be included here. Your dosage, drug form, and how often you take the drug will depend on:. This medication has not been studied in children.
It should not be used in children under the age of 18 years. There are no specific recommendations for senior dosing. Older adults may process drugs more slowly. A typical adult dosage may cause levels of the drug to be higher than normal in your body.
When this drug is used after a heart attack, the dosage is highly individualized.
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