Atenolol 100 mg Tablet, 90-count
🆔 Identity & classification
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🏷️ RxNorm drug class
This medicine belongs to the beta-Adrenergic Blocker class.
Where does this data come from?
🏭 Manufacturer & labeler
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🩺 Clinical
- Atenolol is mainly used for three things: lowering high blood pressure, managing chest pain from angina (narrowed heart arteries), and reducing the risk of dying after a heart atta...
- Please don't stop atenolol suddenly — especially if you have any coronary artery disease, even if you don't know about it. Stopping abruptly has been linked to serious chest pain,...
- Can I just stop taking atenolol if I feel fine?
- The most common ones are feeling tired, a slower heart rate, dizziness, cold hands or feet, and occasionally nausea. Most are mild. The ones to call your doctor about are a very sl...
Patient education
Supplement & herbal interactions
Some supplements/herbs that may interact with Atenolol — tap one for details:
Atenolol may be associated with lower levels of 1 nutrient — worth a chat with your pharmacist, not a cause for alarm.
Where does this data come from?
Ask a licensed pharmacist directly — free, answered by our team.
💊 What it looks like
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🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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UNII XF417D3PSL
Anhydrous citric acid is a sour, crystalline powder derived from citric acid with water removed. In medicines, it acts as a buffer to control pH, adds tartness to improve taste, and helps tablets disintegrate.
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UNII OP1R32D61U
Microcrystalline cellulose is a purified form of cellulose, a natural fiber from plant sources. It acts as a binder and filler in tablets and capsules, helping hold ingredients together and give the medicine its shape and size.
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UNII M28OL1HH48
Croscarmellose sodium is a plant-based substance derived from cellulose. It acts as a disintegrant, helping tablets and capsules break down quickly in the digestive system so the medicine can be absorbed.
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UNII 70097M6I30
Magnesium stearate is a salt made from magnesium and stearic acid, a fatty substance. It's used in tablets and capsules as a lubricant and glidant to help ingredients flow smoothly during manufacturing and prevent sticking.
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UNII FZ989GH94E
Povidone is a synthetic polymer made from a plastic-like material. It acts as a binder to hold tablet ingredients together and as a disintegrant to help the tablet break apart in your stomach so the medicine can be absorbed.
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UNII ETJ7Z6XBU4
Silicon dioxide is a naturally occurring mineral used as a glidant and anti-caking agent. It helps powder ingredients flow smoothly and prevents clumping during manufacturing and storage.
6 inactive ingredients listed in the exact product block matched to this NDC.
Where does this data come from?
ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
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💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per each | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | Not in the retail survey — common for institutional, discontinued, or low-volume packs. | |
| Medicaid paysCMS SDUD · 12 mo | No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data. | |
| Medicare drug plans payPart D · Q2 2026 | $0.0868 | $7.81 / 90 tablets |
Where does this data come from?
🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Atenolol 100 mg 00093-0753-01 | Teva | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 00378-0757-01 | Mylan | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 29300-0412-01 | Unichem | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 51079-0685-20 | Mylan | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 64980-0439-01 | Rising | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 65862-0170-01 | Aurobindo | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 68382-0024-01 | Zydus | 100 tablets | $0.037 | AB | Availability likely | — |
| Atenolol 100 mg 83980-0024-01 | Ipca | 100 tablets | $0.037 | AB | Availability likely | — |
| Tenormin 100 mg 24979-0246-07 | Upsher-Smith | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 43353-0986-60 | Aphena | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 48433-0006-20 | Safecor | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 50090-5738-00 | A-S | 30 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 50090-6311-00 | A-S | 30 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 51655-0104-26 | Northwind | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 51655-0736-26 | Northwind | 90 tablets | — | AB | FDA listed | — |
| Tenormin 100 mg 52427-0431-90 | Almatica | 90 tablets | — | AB | Discontinued | — |
| Atenolol 100 mg 60429-0026-10 | Golden | 1000 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 60760-0642-90 | St | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 65841-0024-01 | Zydus | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mgthis 66267-0029-90 | NuCare | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 67046-1076-03 | Coupler | 30 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 68071-3851-03 | NuCare | 30 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 68071-4751-09 | NuCare | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 68071-5162-01 | NuCare | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 68788-4112-01 | Preferred | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 68788-7535-01 | Preferred | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 70518-4099-00 | REMEDYREPACK | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 71335-1264-01 | Bryant | 100 tablets | — | AB | Discontinued | — |
| Atenolol 100 mg 71335-2531-01 | Bryant | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 71335-2774-01 | Bryant | 100 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 72162-2326-00 | Bryant | 1000 tablets | — | AB | FDA listed | — |
| atenolol 100 mg 72189-0152-90 | direct | 90 tablets | — | AB | FDA listed | — |
| Atenolol 100 mg 87063-0179-01 | ASCLEMED | 100 tablets | — | AB | FDA listed | — |
Where does this data come from?
⏳ Availability & generic status
This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.
Where does this data come from?
📊 Medicare Part D spend CMS · PART D · 2026 (Q1)
📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 66267-0029-30 | 30 TABLET in 1 BOTTLE (66267-029-30) | 2016-09-26 | Active |
| 66267-0029-60 | 60 TABLET in 1 BOTTLE (66267-029-60) | 2016-09-26 | Active |
| 66267-0029-90 You're viewing this | 90 TABLET in 1 BOTTLE (66267-029-90) | 2016-09-26 | Active |
You're viewing the largest of 3 pack sizes for this product.
Pack size FAQ
What quantity is in NDC 66267-0029-90?
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🧭 About this NDC listing & data coverage
What data is (and isn’t) available for this NDC — tap to expand
| NDC identity (package / product / labeler codes) | ✓ Available |
| Labeler | ✓ Available |
| Product & package description | ✓ Available |
| Marketing category & status | ✓ Available |
| Active ingredient / dosage form / route | ✓ Available |
| FDA label (SPL via DailyMed) | ✓ Available |
| Package photos | ✓ Available |
| Inactive ingredients (structured) | ✓ Available |
| NADAC pharmacy acquisition price (CMS) | — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey. |
| Orange Book / therapeutic-equivalence data | ✓ Available |
| HCPCS J-code billing crosswalk | — Not published for this NDC Most self-administered / retail products have no J-code — that is normal. |
| Medicaid utilization (CMS SDUD) | — Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold. |
Questions about this listing
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📄 Full prescribing information FDA SPL
🚨 Boxed Warning ▾
In Patients Without a History of Cardiac Failure Continued depression of the myocardium with beta-blocking agents over a period of time can, in some cases, lead to cardiac failure. At the first sign or symptom of impending cardiac failure, patients should be treated appropriately according to currently recommended guidelines, and the response observed closely. If cardiac failure continues despite adequate treatment, atenolol should be withdrawn (see DOSAGE AND ADMINISTRATION ).
Cessation of Therapy with Atenolol: Patients with coronary artery disease, who are being treated with atenolol, should be advised against abrupt discontinuation of therapy. Severe exacerbation of angina and the occurrence of myocardial infarction and ventricular arrhythmias have been reported in angina patients following the abrupt discontinuation of therapy with beta blockers. The last two complications may occur with or without preceding exacerbation of the angina pectoris.
As with other beta blockers, when discontinuation of atenolol is planned, the patients should be carefully observed and advised to limit physical activity to a minimum. If the angina worsens or acute coronary insufficiency develops, it is recommended that atenolol be promptly reinstituted, at least temporarily. Because coronary artery disease is common and may be unrecognized, it may be prudent not to discontinue atenolol therapy abruptly even in patients treated only for hypertension (see DOSAGE AND ADMINISTRATION).
Cessation of Therapy with Atenolol: Patients with coronary artery disease, who are being treated with atenolol, should be advised against abrupt discontinuation of therapy. Severe exacerbation of angina and the occurrence of myocardial infarction and ventricular arrhythmias have been reported in angina patients following the abrupt discontinuation of therapy with beta blockers. The last two complications may occur with or without preceding exacerbation of the angina pectoris.
As with other beta blockers, when discontinuation of atenolol is planned, the patients should be carefully observed and advised to limit physical activity to a minimum. If the angina worsens or acute coronary insufficiency develops, it is recommended that atenolol be promptly reinstituted, at least temporarily. Because coronary artery disease is common and may be unrecognized, it may be prudent not to discontinue atenolol therapy abruptly even in patients treated only for hypertension (see DOSAGE AND ADMINISTRATION).
🎯 Indications and Usage ▾
INDICATIONS AND USAGE Hypertension Atenolol is indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure lowers the risk of fatal and non-fatal cardiovascular events, primarily strokes and myocardial infarctions. These benefits have been seen in controlled trials of antihypertensive drugs from a wide variety of pharmacologic classes including atenolol.
Control of high blood pressure should be part of comprehensive cardiovascular risk management, including, as appropriate, lipid control, diabetes management, antithrombotic therapy, smoking cessation, exercise, and limited sodium intake. Many patients will require more than 1 drug to achieve blood pressure goals. For specific advice on goals and management, see published guidelines, such as those of the National High Blood Pressure Education Program's Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC).
Numerous antihypertensive drugs, from a variety of pharmacologic classes and with different mechanisms of action, have been shown in randomized controlled trials to reduce cardiovascular morbidity and mortality, and it can be concluded that it is blood pressure reduction, and not some other pharmacologic property of the drugs, that is largely responsible for those benefits. The largest and most consistent cardiovascular outcome benefit has been a reduction in the risk of stroke, but reductions in myocardial infarction and cardiovascular mortality also have been seen regularly.
Elevated systolic or diastolic pressure causes increased cardiovascular risk, and the absolute risk increase per mmHg is greater at higher blood pressures, so that even modest reductions of severe hypertension can provide substantial benefit. Relative risk reduction from blood pressure reduction is similar across populations with varying absolute risk, so the absolute benefit is greater in patients who are at higher risk independent of their hypertension (for example, patients with diabetes or hyperlipidemia), and such patients would be expected to benefit from more aggressive treatment to a lower blood pressure goal.
Some antihypertensive drugs have smaller blood pressure effects (as monotherapy) in black patients, and many antihypertensive drugs have additional approved indications and effects (e.g., on angina, heart failure, or diabetic kidney disease). These considerations may guide selection of therapy. Atenolol may be administered with other antihypertensive agents.
Angina Pectoris Due to Coronary Atherosclerosis Atenolol is indicated for the long-term management of patients with angina pectoris. Acute Myocardial Infarction Atenolol is indicated in the management of hemodynamically stable patients with definite or suspected acute myocardial infarction to reduce cardiovascular mortality. Treatment can be initiated as soon as the patient's clinical condition allows (see DOSAGE AND ADMINISTRATION , CONTRAINDICATIONS , and WARNINGS ).
In general, there is no basis for treating patients like those who were excluded from the ISIS-1 trial (blood pressure less than 100 mm Hg systolic, heart rate less than 50 bpm) or have other reasons to avoid beta blockade. As noted above, some subgroups (e.g., elderly patients with systolic blood pressure below 120 mm Hg) seemed less likely to benefit.
⏱️ Dosage and Administration ▾
DOSAGE AND ADMINISTRATION Hypertension: The initial dose of atenolol is 50 mg given as one tablet a day either alone or added to diuretic therapy. The full effect of this dose will usually be seen within one to two weeks. If an optimal response is not achieved, the dosage should be increased to atenolol 100 mg given as one tablet a day.
Increasing the dosage beyond 100 mg a day is unlikely to produce any further benefit. Atenolol may be used alone or concomitantly with other antihypertensive agents including thiazide-type diuretics, hydralazine, prazosin, and alpha-methyldopa. Angina Pectoris The initial dose of atenolol is 50 mg given as one tablet a day.
If an optimal response is not achieved within one week, the dosage should be increased to atenolol 100 mg given as one tablet a day. Some patients may require a dosage of 200 mg once a day for optimal effect. Twenty-four hour control with once daily dosing is achieved by giving doses larger than necessary to achieve an immediate maximum effect.
The maximum early effect on exercise tolerance occurs with doses of 50 to 100 mg, but at these doses the effect at 24 hours is attenuated, averaging about 50% to 75% of that observed with once a day oral doses of 200 mg. Acute Myocardial Infarction In patients with definite or suspected acute myocardial infarction, treatment with atenolol injection should be initiated as soon as possible after the patient's arrival in the hospital and after eligibility is established. Such treatment should be initiated in a coronary care or similar unit immediately after the patient's hemodynamic condition has stabilized.
Treatment should begin with the intravenous administration of 5 mg atenolol over 5 minutes followed by another 5 mg intravenous injection 10 minutes later. Atenolol injection should be administered under carefully controlled conditions including monitoring of blood pressure, heart rate, and electrocardiogram. Dilutions of atenolol injection in Dextrose Injection USP, Sodium Chloride Injection USP, or Sodium Chloride and Dextrose Injection may be used.
These admixtures are stable for 48 hours if they are not used immediately. In patients who tolerate the full intravenous dose (10 mg), atenolol tablets 50 mg should be initiated 10 minutes after the last intravenous dose followed by another 50 mg oral dose 12 hours later. Thereafter, atenolol can be given orally either 100 mg once daily or 50 mg twice a day for a further 6 to 9 days or until discharge from the hospital.
If bradycardia or hypotension requiring treatment or any other untoward effects occur, atenolol should be discontinued (see full prescribing information prior to initiating therapy with atenolol tablets). Data from other beta blocker trials suggest that if there is any question concerning the use of IV beta blocker or clinical estimate that there is a contraindication, the IV beta blocker may be eliminated and patients fulfilling the safety criteria may be given atenolol tablets 50 mg twice daily or 100 mg once a day for at least seven days (if the IV dosing is excluded).
Although the demonstration of efficacy of atenolol is based entirely on data from the first seven postinfarction days, data from other beta blocker trials suggest that treatment with beta blockers that are effective in the postinfarction setting may be continued for one to three years if there are no contraindications. Atenolol is an additional treatment to standard coronary care unit therapy. Elderly Patients or Patients with Renal Impairment Atenolol is excreted by the kidneys; consequently dosage should be adjusted in cases of severe impairment of renal function.
In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting greater frequency of decreased hepatic, renal or cardiac function, and of concomitant disease or other drug therapy. Evaluation of patients with hypertension or myocardial infarction should always include asse…
⛔ Contraindications ▾
CONTRAINDICATIONS Atenolol is contraindicated in sinus bradycardia, heart block greater than first degree, cardiogenic shock, and overt cardiac failure (see WARNINGS ). Atenolol is contraindicated in those patients with a history of hypersensitivity to the atenolol or any of the drug product’s components.
⚠️ Warnings ▾
WARNINGS Cardiac Failure Sympathetic stimulation is necessary in supporting circulatory function in congestive heart failure, and beta blockade carries the potential hazard of further depressing myocardial contractility and precipitating more severe failure. In patients with acute myocardial infarction, cardiac failure, which is not promptly and effectively controlled by 80 mg of intravenous furosemide or equivalent therapy, is a contraindication to beta blocker treatment. In Patients Without a History of Cardiac Failure Continued depression of the myocardium with beta-blocking agents over a period of time can, in some cases, lead to cardiac failure.
At the first sign or symptom of impending cardiac failure, patients should be treated appropriately according to currently recommended guidelines, and the response observed closely. If cardiac failure continues despite adequate treatment, atenolol should be withdrawn (see DOSAGE AND ADMINISTRATION ). Cessation of Therapy with Atenolol: Patients with coronary artery disease, who are being treated with atenolol, should be advised against abrupt discontinuation of therapy.
Severe exacerbation of angina and the occurrence of myocardial infarction and ventricular arrhythmias have been reported in angina patients following the abrupt discontinuation of therapy with beta blockers. The last two complications may occur with or without preceding exacerbation of the angina pectoris. As with other beta blockers, when discontinuation of atenolol is planned, the patients should be carefully observed and advised to limit physical activity to a minimum.
If the angina worsens or acute coronary insufficiency develops, it is recommended that atenolol be promptly reinstituted, at least temporarily. Because coronary artery disease is common and may be unrecognized, it may be prudent not to discontinue atenolol therapy abruptly even in patients treated only for hypertension (see DOSAGE AND ADMINISTRATION). Concomitant Use of Calcium Channel Blockers Bradycardia and heart block can occur and the left ventricular end diastolic pressure can rise when beta blockers are administered with verapamil or diltiazem.
Patients with preexisting conduction abnormalities or left ventricular dysfunction are particularly susceptible (see PRECAUTIONS ). Bronchospastic Diseases PATIENTS WITH BRONCHOSPASTIC DISEASE SHOULD, IN GENERAL, NOT RECEIVE BETA BLOCKERS. Because of its relative beta 1 selectivity, however, atenolol may be used with caution in patients with bronchospastic disease who do not respond to, or cannot tolerate, other antihypertensive treatment.
Since beta 1 selectivity is not absolute, the lowest possible dose of atenolol should be used with therapy initiated at 50 mg and a beta 2 - stimulating agent (bronchodilator) should be made available. If dosage must be increased, dividing the dose should be considered in order to achieve lower peak blood levels. Major Surgery Chronically administered beta-blocking therapy should not be routinely withdrawn prior to major surgery; however the impaired ability of the heart to respond to reflex adrenergic stimuli may augment the risks of general anesthesia and surgical procedures.
Diabetes and Hypoglycemia Atenolol should be used with caution in diabetic patients if a beta-blocking agent is required. Beta blockers may mask tachycardia occurring with hypoglycemia, but other manifestations such as dizziness and sweating may not be significantly affected. At recommended doses atenolol does not potentiate insulin-induced hypoglycemia and, unlike nonselective beta blockers, does not delay recovery of blood glucose to normal levels.
Thyrotoxicosis Beta-adrenergic blockade may mask certain clinical signs (e.g., tachycardia) of hyperthyroidism. Abrupt withdrawal of beta blockade might precipitate a thyroid storm; therefore, patients suspected of developing thyrotoxicosis from whom atenolol therapy is to be withdrawn should be monitored closely (see DOSAGE AND ADMINISTRATION )…
🤒 Adverse Reactions ▾
ADVERSE REACTIONS Most adverse effects have been mild and transient. The frequency estimates in the following table were derived from controlled studies in hypertensive patients in which adverse reactions were either volunteered by the patient (US studies) or elicited, e.g., by checklist (foreign studies). The reported frequency of elicited adverse effects was higher for both atenolol and placebo-treated patients than when these reactions were volunteered.
Where frequency of adverse effects of atenolol and placebo is similar, causal relationship to atenolol is uncertain. Volunteered ( US Studies ) Total-Volunteered and Elicited ( Foreign + US Studies ) Atenolol (n = 164) % Placebo (n = 206) % Atenolol (n = 399) % Placebo (n = 407) % CARDIOVASCULAR Bradycardia 3 0 3 0 Cold Extremities 0 0.5 12 5 Postural Hypotension 2 1 4 5 Leg Pain 0 0.5 3 1 CENTRAL NERVOUS SYSTEM/ NEUROMUSCULAR Dizziness 4 1 13 6 Vertigo 2 0.5 2
0.2 Lightheadedness 1 0 3
0.7Tiredness 0.6 0.5 26 13 Fatigue 3 1 6 5 Lethargy 1 0 3
0.7Drowsiness 0.6 0 2
0.5Depression 0.6 0.5 12 9 Dreaming 0 0 3 1 GASTROINTESTINAL Diarrhea 2 0 3 2 Nausea 4 1 3 1 RESPIRATORY (see WARNINGS) Wheeziness 0 0 3 3 Dyspnea 0.6 1 6 4 Acute Myocardial Infarction In a series of investigations in the treatment of acute myocardial infarction, bradycardia and hypotension occurred more commonly, as expected for any beta blocker, in atenolol-treated patients than in control patients. However, these usually responded to atropine and/or to withholding further dosage of atenolol. The incidence of heart failure was not increased by atenolol.
Inotropic agents were infrequently used. The reported frequency of these and other events occurring during these investigations is given in the following table. In a study of 477 patients, the following adverse events were reported during either intravenous and/or oral atenolol administration: Conventional Therapy Plus Atenolol (n=244) Conventional Therapy Alone (n=233) Bradycardia 43 (18%) 24 (10%) Hypotension 60 (25%) 34 (15%) Bronchospasm 3 (1.2%) 2 (0.9%) Heart Failure 46 (19%) 56 (24%) Heart Block 11 (4.5%) 10 (4.3%) BBB + Major Axis Deviation 16 (6.6%) 28 (12%) Supraventricular Tachycardia 28 (11.5%) 45 (19%) Atrial Fibrillation 12 (5%) 29 (11%) Atrial Flutter 4 (1.6%) 7 (3%) Ventricular Tachycardia 39 (16%) 52 (22%) Cardiac Reinfarction 0 (0%) 6 (2.6%) Total Cardiac Arrests 4 (1.6%) 16 (6.9%) Nonfatal Cardiac Arrests 4 (1.6%) 12 (5.1%) Deaths 7 (2.9%) 16 (6.9%) Cardiogenic Shock 1 (0.4%) 4 (1.7%) Development of Ventricular Septal Defect 0 (0%) 2 (0.9%) Development of Mitral Regurgitation 0 (0%) 2 (0.9%) Renal Failure 1 (0.4%) 0 (0%) Pulmonary Emboli 3 (1.2%) 0 (0%) In the subsequent International Study of Infarct Survival (ISIS-1) including over 16,000 patients of whom 8,037 were randomized to receive atenolol treatment, the dosage of intravenous and subsequent oral atenolol was either discontinued or reduced for the following reasons: Reasons for Reduced Dosage IV Atenolol Reduced Dose(< 5 mg) Full dosage was 10 mg and some patients received less than 10 mg but more than 5 mg.
Oral Partial Dose Hypotension / Bradycardia 105 (1.3%) 1168 (14.5%) Cardiogenic Shock 4 (.04%) 35 (.44%) Reinfarction 0 (0%) 5 (.06%) Cardiac Arrest 5 (.06%) 28 (.34%) Heart Block (> first degree) 5 (.06%) 143 (1.7%) Cardiac Failure 1 (.01%) 233 (2.9%) Arrhythmias 3 (.04%) 22 (.27%) Bronchospasm 1 (.01%) 50 (.62%) During postmarketing experience with atenolol, the following have been reported in temporal relationship to the use of the drug: elevated liver enzymes and/or bilirubin, hallucinations, headache, impotence, Peyronie's disease, postural hypotension which may be associated with syncope, psoriasiform rash or exacerbation of psoriasis, psychoses, purpura, reversible alopecia, thrombocytopenia, visual disturbance, sick sinus syndrome, and dry mouth.
Atenolol, like other beta blockers, has been associated with the development of antinuclear antibodies (ANA), lupus syndrome, a…
🔄 Drug Interactions ▾
Drug Interactions Catecholamine-depleting drugs (e.g., reserpine) may have an additive effect when given with beta-blocking agents. Patients treated with atenolol plus a catecholamine depletor should therefore be closely observed for evidence of hypotension and/or marked bradycardia, which may produce vertigo, syncope, or postural hypotension. Calcium channel blockers may also have an additive effect when given with atenolol (see WARNINGS ).
Disopyramide is a Type I antiarrhythmic drug with potent negative inotropic and chronotropic effects. Disopyramide has been associated with severe bradycardia, asystole and heart failure when administered with beta blockers. Amiodarone is an antiarrhythmic agent with negative chronotropic properties that may be additive to those seen with beta blockers.
Beta blockers may exacerbate the rebound hypertension, which can follow the withdrawal of clonidine. If the two drugs are coadministered, the beta blocker should be withdrawn several days before the gradual withdrawal of clonidine. If replacing clonidine by beta blocker therapy, the introduction of beta blockers should be delayed for several days after clonidine administration has stopped.
Concomitant use of prostaglandin synthase inhibiting drugs, e.g., indomethacin, may decrease the hypotensive effects of beta blockers. Information on concurrent usage of atenolol and aspirin is limited. Data from several studies, i.e., TIMI-II, ISIS-2, currently do not suggest any clinical interaction between aspirin and beta blockers in the acute myocardial infarction setting.
While taking beta blockers, patients with a history of anaphylactic reaction to a variety of allergens may have a more severe reaction on repeated challenge, either accidental, diagnostic or therapeutic. Such patients may be unresponsive to the usual doses of epinephrine used to treat the allergic reaction. Both digitalis glycosides and beta blockers slow atrioventricular conduction and decrease heart rate.
Concomitant use can increase the risk of bradycardia.
🧒 Pediatric Use ▾
Pediatric Use Safety and effectiveness in pediatric patients have not been established.
🧓 Geriatric Use ▾
Geriatric Use
🆘 Overdosage ▾
OVERDOSAGE Overdosage with atenolol has been reported with patients surviving acute doses as high as 5 g. One death was reported in a man who may have taken as much as 10 g acutely. The predominant symptoms reported following atenolol overdose are lethargy, disorder of respiratory drive, wheezing, sinus pause and bradycardia.
Additionally, common effects associated with overdosage of any beta-adrenergic blocking agent and which might also be expected in atenolol overdose are congestive heart failure, hypotension, bronchospasm and/or hypoglycemia. Treatment of overdose should be directed to the removal of any unabsorbed drug by induced emesis, gastric lavage, or administration of activated charcoal. Atenolol can be removed from the general circulation by hemodialysis.
Other treatment modalities should be employed at the physician's discretion and may include: BRADYCARDIA: Atropine intravenously. If there is no response to vagal blockade, give isoproterenol cautiously. In refractory cases, a transvenous cardiac pacemaker may be indicated.
HEART BLOCK (SECOND OR THIRD DEGREE): Isoproterenol or transvenous cardiac pacemaker. CARDIAC FAILURE: Digitalize the patient and administer a diuretic. Glucagon has been reported to be useful.
HYPOTENSION: Vasopressors such as dopamine or norepinephrine (levarterenol). Monitor blood pressure continuously. BRONCHOSPASM: A beta 2 stimulant such as isoproterenol or terbutaline and/or aminophylline.
HYPOGLYCEMIA: Intravenous glucose. Based on the severity of symptoms, management may require intensive support care and facilities for applying cardiac and respiratory support.
🧬 Clinical Pharmacology ▾
CLINICAL PHARMACOLOGY Atenolol is a beta 1 -selective (cardioselective) beta-adrenergic receptor blocking agent without membrane stabilizing or intrinsic sympathomimetic (partial agonist) activities. This preferential effect is not absolute, however, and at higher doses, atenolol inhibits beta 2 - adrenoreceptors, chiefly located in the bronchial and vascular musculature. Pharmacokinetics and Metabolism In man, absorption of an oral dose is rapid and consistent but incomplete.
Approximately 50% of an oral dose is absorbed from the gastrointestinal tract, the remainder being excreted unchanged in the feces. Peak blood levels are reached between two (2) and four (4) hours after ingestion. Unlike propranolol or metoprolol, but like nadolol, atenolol undergoes little or no metabolism by the liver, and the absorbed portion is eliminated primarily by renal excretion.
Over 85% of an intravenous dose is excreted in urine within 24 hours compared with approximately 50% for an oral dose. Atenolol also differs from propranolol in that only a small amount (6% to 16%) is bound to proteins in the plasma. This kinetic profile results in relatively consistent plasma drug levels with about a fourfold interpatient variation.
The elimination half-life of oral atenolol is approximately 6 to 7 hours, and there is no alteration of the kinetic profile of the drug by chronic administration. Following intravenous administration, peak plasma levels are reached within 5 minutes. Declines from peak levels are rapid (5 to 10 fold) during the first 7 hours; thereafter, plasma levels decay with a half-life similar to that of orally administered drug.
Following oral doses of 50 mg or 100 mg, both beta-blocking and antihypertensive effects persist for at least 24 hours. When renal function is impaired, elimination of atenolol is closely related to the glomerular filtration rate; significant accumulation occurs when the creatinine clearance falls below 35 mL/min/1.73m 2 (see DOSAGE AND ADMINISTRATION ). Pharmacodynamics In standard animal or human pharmacological tests, beta-adrenoreceptor blocking activity of atenolol has been demonstrated by: (1) reduction in resting and exercise heart rate and cardiac output, (2) reduction of systolic and diastolic blood pressure at rest and on exercise, (3) inhibition of isoproterenol induced tachycardia, and (4) reduction in reflex orthostatic tachycardia.
A significant beta-blocking effect of atenolol, as measured by reduction of exercise tachycardia, is apparent within one hour following oral administration of a single dose. This effect is maximal at about 2 to 4 hours, and persists for at least 24 hours. Maximum reduction in exercise tachycardia occurs within 5 minutes of an intravenous dose.
For both orally and intravenously administered drug, the duration of action is dose related and also bears a linear relationship to the logarithm of plasma atenolol concentration. The effect on exercise tachycardia of a single 10 mg intravenous dose is largely dissipated by 12 hours, whereas beta-blocking activity of single oral doses of 50 mg and 100 mg is still evident beyond 24 hours following administration. However, as has been shown for all beta-blocking agents, the antihypertensive effect does not appear to be related to plasma level.
In normal subjects, the beta1 selectivity of atenolol has been shown by its reduced ability to reverse the beta2-mediated vasodilating effect of isoproterenol as compared to equivalent betab-locking doses of propranolol. In asthmatic patients, a dose of atenolol producing a greater effect on resting heart rate than propranolol resulted in much less increase in airway resistance. In a placebo controlled comparison of approximately equipotent oral doses of several beta blockers, atenolol produced a significantly smaller decrease of FEV1 than nonselective beta blockers such as propranolol and, unlike those agents, did not inhibit bronchodilation in response to isoproterenol.
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📦 How Supplied / Storage and Handling ▾
HOW SUPPLIED Atenolol Tablets USP, 100 mg are white to off-white, round uncoated tablets debossed with Z 67 on one side and plain on the other side and are supplied as follows: NDC 66267-029-30 in bottles of 30 tablets NDC 66267-029-60 in bottles of 60 tablets NDC 66267-029-90 in bottles of 90 tablets Store at 20°-25°C (68°-77°F) [See USP Controlled Room Temperature]. Dispense in a tight, light-resistant container. All trademarks are the property of Zydus Group.
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
📋 Description ▾
DESCRIPTION Atenolol, a synthetic, beta 1 -selective (cardioselective) adrenoreceptor-blocking agent, may be chemically described as benzeneacetamide, 4 -[2'-hydroxy-3'-[(1- methylethyl) amino] propoxy]-. The molecular and structural formulas are: Atenolol, USP has a molecular weight of 266. It is a white or almost white powder, sparingly soluble in water; soluble in absolute alcohol and practically insoluble in ether.
Atenolol tablets, for oral administration, are available as 25 mg, 50 mg and 100 mg tablets. Inactive Ingredients: Citric acid (anhydrous), colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, povidone. Atenolol Tablets, USP