Generic Atenolol

Buy Generic Atenolol () without prescription in Canada

At our Canadian pharmacy, you can purchase Atenolol 25 mg, 50 mg, and 100 mg without a prescription, with discreet and anonymous packaging delivered within 5-14 days across Canada. Atenolol is a cardioselective beta-blocker used to manage hypertension, angina pectoris, and to reduce the risk of heart attack. It also helps control certain irregular heart rhythms. The medication lowers blood pressure by slowing the heart rate and reducing the force of heart contractions. Would you like to try Atenolol without a prescription?

Common use Atenolol

Atenolol blocks beta-1 adrenergic receptors in the heart. This action decreases heart rate, reduces cardiac output, and lowers both systolic and diastolic blood pressure. It also cuts myocardial oxygen demand, which helps prevent angina attacks. The drug is used for long-term management of hypertension, either alone or with other antihypertensives, and for stable angina. In the early phase after a myocardial infarction, atenolol improves survival when started promptly. Unlike non-selective beta-blockers, atenolol has less effect on bronchial and vascular smooth muscle at low doses, but selectivity is lost at higher doses. The blood pressure-lowering effect develops over one to two weeks, even though the heart rate slows within hours of the first dose.

Basic Atenolol Information

INN (International Nonproprietary Name): Atenolol
Brand names available in Canada: Tenormin, generics (Apo-Atenolol, Teva-Atenolol, Sandoz Atenolol, Ratio-Atenolol, Mylan-Atenolol)
ATC Code: C07AB03
Forms and dosages: Tablets (25 mg, 50 mg, 100 mg)
Manufacturers in Canada: AstraZeneca Canada (Tenormin), Apotex, Teva Canada, Sandoz, Pharmascience, Mylan Pharmaceuticals
Registration status in Canada: Approved by Health Canada (multiple DINs)
OTC / Rx classification: Prescription only (Rx) – not legally sold over-the-counter in Canadian pharmacies

Dosage and direction

For hypertension, the usual starting dose of atenolol is 25 to 50 mg once daily. The dose may be increased to 100 mg once daily after one to two weeks if blood pressure response is inadequate. For angina, the typical dose is 50 to 100 mg once daily, sometimes split into two doses. After a myocardial infarction, atenolol is often started at 25 to 50 mg once daily, then adjusted. The tablet can be taken with or without food. Take it at the same time each day, usually in the morning. Do not stop atenolol abruptly, because sudden withdrawal can trigger rebound hypertension, worsening angina, or even myocardial infarction. The dose should be tapered over one to two weeks under medical supervision.

Precautions

Atenolol can mask the symptoms of hypoglycemia in diabetic patients, especially tachycardia. If you have diabetes, monitor your blood glucose more closely when starting or adjusting atenolol. The drug may worsen peripheral circulation in patients with Raynaud phenomenon or severe peripheral arterial disease. Tell your doctor if you have asthma, chronic obstructive pulmonary disease, or any bronchospastic condition, because even cardioselective beta-blockers can cause bronchoconstriction at higher doses. Atenolol can cause bradycardia; if your resting heart rate drops below 50 beats per minute, contact your doctor. The medication may worsen heart failure in some patients, although beta-blockers are also used to treat heart failure when titrated carefully. Elderly patients and those with kidney impairment require dose adjustment because atenolol is excreted unchanged by the kidneys. Do not use atenolol if you are pregnant or breastfeeding without medical advice.

Contraindications

Atenolol is contraindicated in patients with sinus bradycardia (heart rate below 45 to 50 beats per minute before treatment), second or third degree atrioventricular block without a pacemaker, cardiogenic shock, and overt heart failure that is not stabilized. It should not be used in patients with known hypersensitivity to atenolol or any beta-blocker. The medication is contraindicated in untreated pheochromocytoma, because unopposed alpha-adrenergic activity can cause a hypertensive crisis. Atenolol should not be used during pregnancy, especially in the second and third trimesters, because it may cause fetal bradycardia and growth restriction. Patients with severe peripheral vascular disease should avoid atenolol unless absolutely necessary.

Side effects

Common side effects of atenolol include fatigue, cold hands and feet, dizziness, and slow heart rate. Some patients report insomnia, vivid dreams, or mild depression. Gastrointestinal upset, such as nausea or diarrhea, occurs occasionally. Sexual dysfunction and reduced libido are less frequent but possible. Serious side effects requiring immediate medical attention include severe bradycardia, fainting, worsening heart failure with shortness of breath or leg swelling, bronchospasm with wheezing, and signs of a severe allergic reaction. In diabetic patients, atenolol can blunt the warning signs of low blood sugar. If you notice confusion, unusual weight gain, or swelling in the ankles, contact your doctor. Most side effects diminish after the first weeks of treatment.

Drug interaction

Atenolol interacts with several classes of drugs. Calcium channel blockers like verapamil and diltiazem can cause additive effects on heart rate and conduction, leading to severe bradycardia or heart block. Clonidine withdrawal may cause rebound hypertension if atenolol is stopped first; the beta-blocker should be discontinued before tapering clonidine. Nonsteroidal anti-inflammatory drugs, including ibuprofen and naproxen, can reduce the antihypertensive effect of atenolol. Amiodarone may further slow the heart rate. Reserpine and other catecholamine-depleting drugs increase the risk of hypotension and bradycardia. In patients taking insulin or oral hypoglycemics, atenolol can delay recovery from hypoglycemia. Tell your doctor about all medications, including over-the-counter cold remedies, because some contain sympathomimetics that increase blood pressure.

Missed dose

If you forget a dose of atenolol, take it as soon as you remember, unless it is within 4 hours of your next scheduled dose. In that case, skip the missed dose and continue with your normal schedule. Do not double the dose to catch up. If you miss several doses in a row, contact your doctor, because sudden re-initiation at full dose may cause a rapid drop in heart rate or blood pressure.

Overdose

Atenolol overdose can cause severe bradycardia, hypotension, heart block, cardiogenic shock, and bronchospasm. The onset of symptoms may be delayed, so observation in a hospital setting is necessary. Treatment includes activated charcoal if ingestion was recent, atropine for bradycardia, glucagon for refractory hypotension, and temporary pacing if heart block occurs. Hemodialysis can remove atenolol from the circulation. Do not attempt to manage an overdose at home. Call 911 or go to the nearest emergency department if you or someone else has taken too much atenolol.

Storage

Store atenolol tablets at room temperature between 15 and 30 degrees Celsius (59 and 86 degrees Fahrenheit). Keep the container tightly closed and protect from light and moisture. Do not store in the bathroom or near a sink. Keep the tablets out of sight and reach of children and pets. Discard any unused medication after the expiry date on the label. Do not flush tablets down the toilet unless instructed to do so.

Disclaimer

We provide only general information about medications which does not cover all directions, possible drug integrations, or precautions. Information at the site cannot be used for self-treatment and self-diagnosis. Any specific instructions for a particular patient should be agreed with your health care adviser or doctor in charge of the case. We disclaim reliability of this information and mistakes it could contain. We are not responsible for any direct, indirect, special or other indirect damage as a result of any use of the information on this site and also for consequences of self-treatment.