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**Drug:** Att%2525252525252525252525252525252525252525252525252525252525252520drugs
## Overview
Atenolol is a selective beta-1 adrenergic receptor blocker (cardioselective). It primarily affects the heart and reduces heart rate, myocardial contractility, and blood pressure.
## Primary Indications
* Hypertension
* Angina Pectoris
* Myocardial Infarction (post-MI management)
* Arrhythmias (e.g., supraventricular tachycardia, atrial fibrillation rate control)
## Adult Dosing
* **Hypertension:** Start with 50 mg once daily. May increase to 100 mg once daily. Maximum dose: 100 mg once daily.
* **Angina Pectoris:** Start with 50 mg once daily. May increase to 100 mg once daily. Maximum dose: 100 mg once daily.
* **Myocardial Infarction:** Initial IV dose of 5 mg given every 2 minutes for a total of 3 doses, followed by oral doses of 50 mg every 12 hours, starting 12 hours after the last IV dose. If oral administration is tolerated, continue with 100 mg once daily.
## Pediatric Dosing
Limited data available. Dosing varies based on indication and clinical judgment. Typically initiated at lower doses and titrated cautiously. Consult pediatric-specific resources for guidance.
## Dose Adjustments
* **Renal Impairment:** Dose adjustment is necessary.
* CrCl 15-35 mL/min: 50 mg once daily.
* CrCl <15 mL/min: 25 mg once daily or 50 mg every other day.
* Hemodialysis: 50 mg taken after each dialysis session.
## Contraindications
* Cardiogenic shock
* Second- or third-degree atrioventricular (AV) block
* Sick sinus syndrome
* Bradycardia (heart rate less than 45-50 bpm)
* Heart failure
* Hypersensitivity to atenolol or other beta-blockers
## Adverse Effects
* Bradycardia
* Hypotension
* Fatigue, dizziness
* Cold extremities
* Bronchospasm (especially in patients with asthma or COPD)
* Masking of hypoglycemia symptoms (except sweating)
* Depression
* Gastrointestinal disturbances
## Key Drug Interactions
* **Calcium Channel Blockers (e.g., verapamil, diltiazem):** Increased risk of bradycardia, AV block, and heart failure.
* **Digoxin:** Increased risk of bradycardia.
* **Other Antihypertensives:** Additive hypotensive effects.
* **Epinephrine:** May blunt the pressor response and cause reflex bradycardia.
* **NSAIDs:** May reduce antihypertensive effect.
* **Insulin/Oral Antidiabetics:** May mask signs of hypoglycemia.
## Monitoring
* Blood pressure
* Heart rate
* Signs of heart failure (edema, dyspnea)
* Renal function
* Blood glucose levels in diabetic patients
## Clinical Pearls
* Atenolol is cardioselective, but this selectivity is lost at higher doses.
* Abrupt withdrawal can precipitate angina, myocardial infarction, or arrhythmias. Taper dose gradually over 1-2 weeks.
* Use with caution in patients with bronchospastic disease.
* Atenolol is renally excreted; dose adjustment is critical in renal impairment.
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*Disclaimer: This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and relevant clinical guidelines for complete and up-to-date information before making any treatment decisions.*
