Brand names: Betapace, Betapace AF, Sorine, Sotylize
Drug class: alpha-Adrenergic Blocking Agents

Medically reviewed by Drugs.com on Apr 10, 2024. Written by ASHP.

Introduction

Nonselective β-adrenergic blocking agent; exhibits antiarrhythmic activity characteristic of class II antiarrhythmic agents and electrophysiologic effects characteristic of class III antiarrhythmic agents.^{1 2 7 8 12 13 14 15 402 403 404}

Uses for Sotalol

Ventricular Arrhythmias

Used to suppress and prevent recurrence of documented life-threatening ventricular arrhythmias (e.g., sustained ventricular tachycardia);^{1 4 5 6 7 8 11 12 26 400 401 402 403 404 405} designated an orphan drug by FDA for such use.⁹

Shown to be effective in patients with life-threatening ventricular arrhythmias (e.g., sustained ventricular tachycardia or fibrillation) as well as those with less severe arrhythmias (e.g., premature ventricular complexes [PVCs], paired PVCs, nonsustained ventricular tachycardia)^{1 4 5 6 7 11 12 402 403 404}

Although antiarrhythmic drugs, including sotalol, may suppress the recurrence of arrhythmias and improve symptoms, there is no evidence from randomized controlled studies indicating that these drugs have a beneficial effect on mortality or sudden death.^{1 405}

Because of arrhythmogenic potential, lack of evidence for improved survival, and risk of serious adverse effects (see Proarrhythmic Effects under Cautions), use in patients with less severe arrhythmias, even if symptomatic, generally notrecommended.^{1 402 403}

Avoid treatment of asymptomatic PVCs.^{1 3 4 7 8 12 14 402 403 404}

Not a first-line drug of choice during cardiac arrest, but may be used for treatment of hemodynamically stable sustained monomorphic ventricular tachycardia; included in current ACLS guidelines for adult tachycardia.^{400 401 405}

Supraventricular Arrhythmias

Used to maintain normal sinus rhythm in patients with symptomatic atrial fibrillation or flutter who are currently in sinus rhythm.^{1 301 402 403 404}

Because of potential for life-threatening ventricular arrhythmias, reserve use for highly symptomatic atrial fibrillation/flutter.^{1 42 51 56 57 402 403 404} (See Proarrhythmic Effects under Cautions.) Do not use in patients with easily reversible (e.g., with Valsalva maneuver) paroxysmal atrial fibrillation.^{1 402 403 404}

Efficacy in preventing atrial fibrillation or flutter recurrences is comparable to that of quinidine or propafenone and less than that of amiodarone.^{43 44 45 47 301}

Also has been used for treatment of other supraventricular tachycardias (SVTs), including paroxysmal supraventricular tachycardia (PSVT)^{† [off-label]} due to AV nodal reentry tachycardia (AVNRT) or AV reentry tachycardia (AVRT).^{64 300}

Related/similar drugs

diltiazem, Xarelto, digoxin, rivaroxaban, flecainide, magnesium sulfate, propafenone

Sotalol Dosage and Administration

General

• Initiate or reinitiate therapy and adjust dosage (or perform conversion from IV to oral therapy) in an institutional setting where patient can be monitored by personnel trained in the management of serious arrhythmias.^{1 7 8 42 48 402 403 404} (See Boxed Warning.)

• Closely monitor patient for ≥3 days (or until steady-state plasma concentrations are achieved) whenever treatment is initiated, reinitiated, or dosage is increased.^{1 402 403 404}

• Prior to treatment, calculate Cl_cr and determine QT_c interval.^{1 402 403 404} (See Contraindications under Cautions.) When titrating dosage, monitor QT interval 2–4 hours after each dose increase (if given orally) or after completion of each IV infusion.^{1 402 403 404}

• Individualize dosage according to Cl_cr and QT_c.^{1 403 404} Discontinue therapy, reduce dose, or increase dosing interval if QT_c ≥500 msec.^{1 403 404}

• Measure serum potassium and magnesium concentrations prior to initiating therapy and correct any imbalances.^{1 404}

• Ensure adequate anticoagulation in patients with atrial fibrillation/flutter.⁴⁰²

Conversion from Other Antiarrhythmic Agents

• A transition period is recommended for patients converting from another antiarrhythmic agent to sotalol.^{1 404}

• In general, delay initiation of sotalol for a period of at least 2–3 elimination half-lives of the previously administered antiarrhythmic drug; monitor patients carefully during transition.^{1 404} (See Specific Drugs under Interactions.)

Administration

Administer orally or by IV infusion (when oral administration not feasible).^{1 402 403 404}

Oral Administration

Administer orally as a tablet or oral solution (using the commercially available oral solution or an extemporaneously prepared solution).^{1 403 404}

Administer oral solution using appropriate measuring device (e.g., oral dosing syringe); use of a teaspoon or tablespoon may result in dosing errors and is not recommended.⁴⁰³

Do not administer aluminum oxide and magnesium hydroxide-containing antacids within 2 hours of administration of sotalol.¹ (See Specific Drugs under Interactions.)

Extemporaneous Oral Solution

To prepare extemporaneous oral solution, add 5 tablets (120 mg each) to a 180-mL polyethylene terephthalate (PET) prescription bottle containing 120 mL of simple syrup with 0.1% sodium benzoate (syrup NF); an oversized bottle is used to allow more effective shaking of the mixture.^{1 404}

May add tablets intact to syrup, add syrup to tablets, or crush tablets (making sure to add entire quantity of tablet powder to syrup).^{1 404}

Shake mixture to wet tablets, allow to hydrate for ≥2 hours, then shake intermittently over another 2 hours until dispersion of fine particles is obtained; may hydrate overnight to simplify disintegration process.^{1 404}

If tablets are crushed, shake until a dispersion of fine particles is obtained.^{1 404}

Resulting preparation contains 5 mg/mL of sotalol hydrochloride in solution with suspended inactive solid particles (water-insoluble tablet ingredients).¹ (See Storage under Stability.)

IV Administration

For solution and drug compatibility information, see Compatibility under Stability.

Administer by IV infusion over 5 hours.⁴⁰² Use a volumetric pump to ensure that drug is delivered at a constant rate.⁴⁰²

Must dilute commercially available injection concentrate with a suitable diluent (i.e., 0.9% sodium chloride injection, 5% dextrose injection, lactated Ringer’s injection) prior to administration.⁴⁰² Manufacturer recommends that the volume of injection concentrate used to prepare the infusion solution and the final infusion solution volume exceed those required for the intended dose to account for dead space in infusion set.⁴⁰² Preparation of a final volume of 120 or 300 mL is recommended; however, actual volume that should be infused is 100 or 250 mL, respectively.⁴⁰² (See Table 1.)

Dosage

Available as sotalol hydrochloride; dosage expressed in terms of the salt.^{1 402 403 404} Adjust dosage carefully according to individual requirements and response, patient tolerance, renal function, and QT interval.^{1 4 8 402 403 404}

If a dose is missed, skip dose and take next dose at regularly scheduled time.^{1 403 404} Do not take a double dose or increase dosing frequency to compensate for missed dose.^{1 403 404}

Pediatric Patients

Life-threatening Ventricular Arrhythmias or Atrial Fibrillation/Flutter

Dosage in pediatric patients is based on pharmacokinetic data; safety and efficacy not evaluated in this population.^{1 402 403 404} Take the same precautions as in adults.^{1 402 403 404} Individualize dosage based on clinical response, heart rate, and QT_c.^{1 402 404}

There are no studies of IV sotalol in pediatric patients.⁴⁰²

Oral

Children ≥2 years of age with normal renal function: Initially, 30 mg/m² 3 times daily (total daily dose of 90 mg/m²).^{1 402 403 404} May titrate dosage to maximum of 60 mg/m² 3 times daily (equivalent to total daily dose of 360 mg in adults).^{1 402 403 404} Allow ≥36 hours to elapse between dosage escalations to achieve steady-state concentrations.^{1 402 403 404}

Children ≤2 years of age: Calculate dosage by multiplying the recommended initial dosage for children ≥2 years of age (i.e., 30 mg/m² 3 times daily) by an age-dependent factor obtained from manufacturer’s prescribing information.^{1 402 403 404} The age-dependent factor is approximately 0.3 in neonates 1 week old, 0.68 in infants 1 month of age, and 0.97 in infants 20 months of age.^{1 402 403 404} (See Table 2.) Use similar calculations for dosage increases.^{402 403 404}

To obtain dosages for ages not mentioned in this table, see age/factor graph in manufacturer’s prescribing information

See age/factor graph in manufacturer’s prescribing information for age-dependent factor

Adults

Life-threatening Ventricular Arrhythmias

Oral

Initially, 80 mg twice daily in adults with normal renal function (Cl_cr >60 mL/minute).^{1 403 404 405} May increase dosage in increments of 80 mg per day every 3 days if QT_c <500 msec.^{1 403 404}

Usual maintenance dosage: 160–320 mg daily in 2 or 3 divided doses;^{1 404} dosing >2 times a day usually not necessary.^{1 404}

Dosages as high as 480–640 mg daily have been used in patients with refractory life-threatening arrhythmias; however, risk of arrhythmic events increases with increasing dosage.^{1 8 403 404} (See Proarrhythmic Effects under Cautions.)

IV

Equivalent IV doses of sotalol hydrochloride are lower than oral doses; corresponding IV doses are as follows: 75 mg for an oral dose of 80 mg, 112.5 mg for an oral dose of 120 mg, and 150 mg for an oral dose of 160 mg.⁴⁰²

Initially, 75 mg once or twice daily (depending on Cl_cr) by IV infusion over 5 hours.^{402 405} (See Renal Impairment under Dosage and Administration.) If desired response not achieved and drug is well tolerated without excessive QT interval prolongation, may increase dosage to 112.5 mg once or twice daily (depending on Cl_cr); manufacturer recommends that dosage be increased in increments of 75 mg daily every 3 days.⁴⁰² Closely monitor ECG and QT interval during dose increases.⁴⁰²

Based on experience with oral sotalol hydrochloride, the usual therapeutic effect should be observed with IV dosages of 75–150 mg once or twice daily; however, patients with life-threatening refractory ventricular arrhythmias have received higher dosages (e.g., oral dosages of 240–320 mg once or twice daily corresponding to IV dosages of 225–300 mg once or twice daily).⁴⁰²

Atrial Fibrillation or Flutter

Oral

For maintenance of normal sinus rhythm in adults with atrial fibrillation or flutter who have normal renal function (Cl_cr >60 mL/minute): Initially, 80 mg twice daily.^{1 42 61 403 404} May increase dosage in increments of 80 mg per day every 3 days if QT_c <500 msec.^{1 403 404}

In a dose-response study, the most effective dosage was 120 mg once or twice daily.^{1 42 45 403 404} Some clinicians state that dosage may be increased up to a maximum of 160 mg twice daily (provided drug is well tolerated and QT_c <500 msec).^{26 47 50 403}

IV

Equivalent IV doses of sotalol hydrochloride are lower than oral doses; corresponding IV doses are as follows: 75 mg for an oral dose of 80 mg, 112.5 mg for an oral dose of 120 mg, and 150 mg for an oral dose of 160 mg.⁴⁰²

For maintenance of normal sinus rhythm in adults with atrial fibrillation or flutter: Initially, 75 mg once or twice daily (depending on Cl_cr) by IV infusion over 5 hours.⁴⁰² (See Renal Impairment under Dosage and Administration.)

If desired response not achieved and drug is well tolerated without excessive QT interval prolongation, may increase dosage after at least 3 days to 112.5 mg once or twice daily (depending on Cl_cr).⁴⁰² Closely monitor ECG and QT interval during dose increases.⁴⁰²

Based on experience with oral sotalol hydrochloride, the usual therapeutic effect should be observed with an IV dosage of 112.5 mg once or twice daily; however, manufacturer states that dosage may be increased up to 150 mg once or twice daily if necessary provided drug is well tolerated.⁴⁰²

Prescribing Limits

Pediatric Patients

Life-threatening Ventricular Arrhythmias or Atrial Fibrillation/Flutter

Oral

Children ≥2 years of age: Maximum of 60 mg/m² 3 times daily.¹

Children ≤2 years of age: Reduce maximum dosage in children ≥2 years of age (i.e., 60 mg/m² 3 times daily) by an age-dependent factor obtained from manufacturer’s prescribing information.¹ (See Dosage: Pediatric Patients, under Dosage and Administration.)

Adults

Atrial Fibrillation or Flutter

Oral

Some clinicians recommend maximum of 320 mg daily (160 mg twice daily);^{26 47 50 404} increased incidence of torsades de pointes with higher dosages.^{1 47 403} (See Proarrhythmic Effects under Cautions.)

Special Populations

Hepatic Impairment

Manufacturers make no specific dosage recommendations.^{1 402 403 404}

Renal Impairment

Reduce dose or dosing frequency to minimize risk of proarrhythmia; as in patients with normal renal function, closely monitor QT interval and heart rate.^{1 26 402 403 404} (See Proarrhythmic Effects under Cautions.)

Modify dosing interval according to Cl_cr.^{1 402 403 404} In general, administer the initial oral adult dose of 80 mg and subsequent doses twice daily in adults with Cl_cr>60 mL/minute and once daily in adults with Cl_cr 40–60 mL/minute.^{402 403} Generally contraindicated in patients with Cl_cr<40 mL/minute.^{1 402 403 404} In patients with ventricular arrhythmias, some manufacturers recommend a dosing interval of 36–48 hours in adults with Cl_cr 10–29 mL/minute and individualized dosing in those with Cl_cr<10 mL/minute.^{1 404}

Since elimination half-life is prolonged in patients with renal impairment, dosage increases generally should be made after administration of at least 5 doses at appropriate intervals.^{1 8 404}

Dosage in children with renal impairment not established.^{1 404} However, reduced doses and increased dosing intervals recommended for all age groups with renal impairment.^{1 404}

Sotalol is partially removed by dialysis; however, manufacturers make no dosing recommendations for patients undergoing dialysis.^{1 404}

Geriatric Patients

Modification of dosage based on age alone is not necessary.¹

Because geriatric patients may have decreased renal function and because patients with renal impairment may be at increased risk of sotalol-induced toxicity, monitor closely and adjust dosage accordingly.¹ (See Renal Impairment under Dosage and Administration.)

Cautions for Sotalol

Contraindications

• Bronchial asthma or related bronchospastic conditions.^{1 42 43 44 47 48 49 402 403 404}

• Sinus bradycardia (<50 bpm while awake).^{1 42 43 44 47 48 49 402 403 404}

• Sick sinus syndrome or second or third degree AV block unless a functioning pacemaker is present.^{1 42 43 44 45 47 48 49 402 403 404}

• Congenital or acquired long QT interval syndromes.^{1 42 43 44 47 48 49 402 403 404}

• Baseline QT interval >450 msec (some manufacturers state this is a contraindication only in patients being treated for atrial fibrillation or flutter).^{1 42 402 403 404}

• Cardiogenic shock.^{1 42 43 44 47 48 49 402 403 404}

• Decompensated heart failure.^{1 42 43 44 47 48 49 402 403 404}

• Hypokalemia (serum potassium <4 mEq/L).^{1 402 403 404}

• Cl_cr <40 mL/minute (some manufacturers state this is a contraindication only in patients being treated for atrial fibrillation or flutter).^{1 402 403 404}

• Known hypersensitivity to sotalol or any ingredient in the formulation.^{1 42 43 44 47 48 49 403 404}

Warnings/Precautions

Warnings

Proarrhythmic Effects

Can cause serious ventricular arrhythmias, principally torsades de pointes, associated with prolonged QT interval; risk increases progressively with QT interval prolongation.^{1 6 8 28 402 403 404} (See Boxed Warning.)

Arrhythmogenic events occur not only when initiating therapy, but with every upward dosage adjustment.^{1 3 4 7 47 402 404}

QT interval prolongation is dose related.^{1 402 403 404}

Risk of torsades de pointes increases with decreased Cl_cr, female gender, larger doses, reduction of heart rate, hypokalemia,^{1 3 402 404} presence of sustained ventricular tachycardia, excessive QT_c interval prolongation, history of cardiomegaly or heart failure.^{1 402} Decrease risk by adjusting dosage based on Cl_cr and monitoring ECG for excessive QT interval prolongation.^{1 402 404} Take appropriate precautions during administration.^{1 402 403 404} (See General under Dosage and Administration.)

Heart Failure

New onset or worsening heart failure may occur.^{1 403 404} Use contraindicated in patients with decompensated heart failure.^{1 403 404} (See Contraindications under Cautions.)

Monitor for signs and symptoms of heart failure and discontinue therapy if symptoms occur.¹

Electrolyte Disturbances

Electrolyte abnormalities (e.g., hypokalemia or hypomagnesemia) may exaggerate the degree of QT interval prolongation and increase the risk of torsades de pointes.^{1 3 403 404} Use not recommended until these imbalances are corrected.^{1 42 45 48 403 404}

Carefully monitor electrolyte and acid-base balance in patients with severe or prolonged diarrhea and in patients receiving diuretics concomitantly.^{1 45 47 50 402 403 404}

Bradycardia

Potential bradycardia in patients treated for supraventricular arrhythmias; associated with increased risk of torsades de pointes.^{1 403 404}

Abrupt Withdrawal of Therapy

Abrupt withdrawal may exacerbate angina symptoms and/or precipitate MI, particularly in patients with ischemic heart disease, or may precipitate thyroid storm in patients with thyroid disease.^{1 402 403 404}

Avoid abrupt discontinuance.^{1 402 403 404} If possible, gradually decrease dosage over a period of 1–2 weeks when discontinuing therapy, particularly in patients with ischemic heart disease; monitor patients.^{1 402 403 404}

If exacerbation of angina occurs or acute coronary insufficiency develops, initiate appropriate treatment (e.g., temporary use of another β-blocker).^{1 403 404}

Bronchospastic Disease

Use contraindicated in patients with bronchial asthma or related bronchospastic conditions.^{1 402 403 404} (See Contraindications under Cautions.)

Use not recommended in patients with nonallergic bronchospasm (e.g., chronic bronchitis, emphysema);^{1 402 404} use smallest effective dosage to minimize inhibition of bronchodilation produced by endogenous or exogenous catecholamine stimulation of β₂-adrenergic receptors.^{1 402 403 404}

History of Anaphylactic Reactions

Possible increased reactivity to a variety of allergens; patients may be unresponsive to usual doses of epinephrine used to treat anaphylactic reactions.^{1 402 403 404}

Surgery

Some controversy exists regarding use of β-blockers during surgery.^{34 402} Hypotension, bradycardia, and stroke have occurred; in addition, it is unclear whether such use confers mortality benefits or risks.^{34 35 402}

Generally continue β-blockers during surgery in patients who are already receiving these drugs for a chronic condition.^{1 34 404} Consider risks versus benefits in individual patients.^{1 34 404}

Hypotension

Hypotension reported;^{1 402 403 404} monitor BP in patients with marginal cardiac compensation.^{1 402 403 404}

Diabetes Mellitus

Possible decreased signs and symptoms of acute hypoglycemia (e.g., tachycardia).^{1 402 404} May increase blood glucose concentrations and insulin requirements in diabetic patients.^{1 402 404}

Sick Sinus Syndrome

Possible increased risk of torsades de pointes in patients with atrial fibrillation and sinus node dysfunction, especially after cardioversion.^{49 50 402 403} Use contraindicated in patients with sick sinus syndrome unless a functioning pacemaker is present due to risk of sinus bradycardia, sinus pause, or sinus arrest.^{1 45 48 402 403} (See Contraindications under Cautions.)

Thyroid Abnormalities

Signs of hyperthyroidism (e.g., tachycardia) may be masked.^{1 402 403 404}

Possible thyroid storm if therapy is abruptly withdrawn.^{1 402 403 404} (See Abrupt Withdrawal of Therapy under Cautions.)

General Precautions

Other Precautions

Shares the toxic potentials of other nonselective β-adrenergic blocking agents; observe usual precautions of these agents.^{1 3 4 5 6 7 8}

Specific Populations

Pregnancy

Category B.^{1 402 403 404}

Lactation

Distributed into milk.^{1 402 403 404} Discontinue nursing or the drug.^{1 403 404}

Pediatric Use

Safety and efficacy not established in children <18 years of age.^{1 26 402 403 404}

Class III electrophysiologic and β-blocking effects, pharmacokinetics and the relationship between plasma concentrations and effects (e.g., QT_c intervals, resting heart rate) have been evaluated in children 3 days to 12 years of age.^{1 402 403 404}

Has been effective in a limited number of infants <3 months of age^{29 30} and children <18 years of age³⁰ for supraventricular arrhythmias; ^{29 30} less effective for ventricular arrhythmias.³⁰ Mild sinus bradycardia occurred in most infants;²⁹ fatigue occurred in several children and required discontinuance in a few.³⁰

Similar to adults, serious adverse events including death, torsades de pointes, other proarrhythmias, AV block, and bradycardia have been reported in infants and children; usual precautions in adults should also be observed in pediatric patients.^{1 402}

Geriatric Use

Insufficient experience in geriatric patients to determine whether safety and efficacy in geriatric patients differ from safety and efficacy in younger adults; however clinical trials of sotalol included many patients >50 years of age.^{3 4 5 6 8}

Overall risk of cardiac death was associated with increasing age in clinical trials.⁸

Monitor closely and adjust dosage accordingly due to greater frequency of decreased renal function and increased risk of toxicity observed in the elderly.^{1 403}

Hepatic Impairment

Clearance of sotalol not altered by hepatic impairment.^{1 402 403 404}

Renal Impairment

Clearance is decreased depending on degree of renal impairment.¹ (See Special Populations under Pharmacokinetics.)

Dosage adjustments necessary based on degree of renal impairment.^{1 404} (See Renal Impairment under Dosage and Administration.)

Partially removed by dialysis;^{1 404} monitor closely for efficacy of arrhythmia control and adverse effects (changes in heart rate and/or QT interval).¹

Common Adverse Effects

Common adverse effects based on use of oral sotalol: Sinus bradycardia (heart rate <50 bpm),^{1 3 4 5 28 402} arrhythmogenic effects,^{1 402} chest pain,^{1 3 28 402} palpitation,^{1 3 28 402} hypotension,^{1 402} fatigue,^{1 3 28 42 402} dizziness,^{1 3 28 42} asthenia,^{1 3 28} hyperhidrosis,^{1 402} lightheadedness,^{1 402} upper respiratory tract problems,¹ visual problems,¹ sleep problems,^{1 402} weakness,^{1 402} dyspnea,^{1 3 28 402} headache,^{1 402} cough,¹ nausea,^{1 3} vomiting,^{1 3 402} diarrhea,^{1 402} abdominal pain,¹ edema,⁴⁰² extremity pain.⁴⁰²

Drug Interactions

Drugs metabolized by CYP isoenzymes do not alter the pharmacokinetics of sotalol; sotalol does not induce or inhibit any CYP isoenzymes.^{1 404}

Specific Drugs

Sotalol Pharmacokinetics

Absorption

Bioavailability

90–100%.^{1 403 404}

Peak plasma concentrations are reached in 2.5–4 hours following oral administration.^{1 403 404}

Steady-state plasma concentrations are reached in 2–3 days following twice-daily oral administration.^{1 403 404}

Food

Food reduces oral bioavailability by about 20%.^{1 403 404}

Distribution

Extent

Crosses the placenta; found in amniotic fluid.^{402 404}

Does not readily cross blood-brain barrier.^{1 403 404}

Plasma Protein Binding

Does not bind to plasma proteins.^{1 403 404}

Elimination

Metabolism

Not metabolized.^{1 404}

Elimination Route

Eliminated principally by glomerular filtration and tubular secretion; excreted principally unchanged in urine.^{1 403 404}

Half-life

12 hours.^{1 403 404}

Special Populations

Renal impairment may reduce clearance.^{1 404} Elimination half-life in anuric patients may be prolonged (up to 69 hours).^{1 404} (See Renal Impairment under Dosage and Administration.)

In pediatric patients, half-life decreases with decreasing age <2 years of age.⁴⁰²

Stability

Storage

Oral

Solution

Commercially available oral solution: 20–25°C (may be exposed to 15–30°C).⁴⁰³

Extemporaneous oral solution: 15–30°C at ambient humidity; stable for ≤3 months after preparation.¹

Tablets

Tight, light-resistant container at 20–25°C (may be exposed to 15–30°C).^{1 404}

Parenteral

Injection

20–25°C.⁴⁰² Protect from freezing and light.⁴⁰²

Compatibility

Parenteral

Solution Compatibility402

Actions

• Inhibits response to adrenergic stimuli by competitively blocking β₁-adrenergic receptors within the myocardium and β₂-adrenergic receptors within bronchial and vascular smooth muscle.^{2 7 8}

• Exhibits antiarrhythmic activity characteristic of class II antiarrhythmic agents.^{1 2 7 8 404}

• Does not exhibit membrane-stabilizing activity,^{1 8} but exhibits electrophysiologic effects characteristic of class III antiarrhythmic agents (e.g., prolongs repolarization and refractoriness without affecting conduction).^{1 2 7 8 12 13 14 15}

• Does not exhibit intrinsic sympathomimetic activity.⁸

• Selectively inhibits the rapidly activating component of the potassium channel involved in repolarization of cardiac cells (i.e., the rapidly activated inward component of the delayed rectifier potassium current I_Kr) in vitro.^{12 13 14 15}

• Does not appear to block sodium channels at usual doses (although it may at relatively high doses).^{12 16 26 27}

• Racemic mixture of 2 optical isomers that both exhibit class III antiarrhythmic activity,^{1 7 11 14 15} but only the l-isomer exhibits β-blocking activity.^{1 7 11 14 404}

Advice to Patients

• If a dose is missed, importance of taking next scheduled dose at the usual time and not doubling the dose to make up for missed dose.^{1 403}

• Importance of patients immediately contacting their clinician if syncope, pre-syncopal symptoms, or cardiac palpitations occur.^{1 402 403 404}

• Importance of advising patients that their electrolytes and ECG will be monitored during treatment.^{1 404}

• Importance of informing patients (especially those with ischemic heart disease) not to interrupt or discontinue therapy without consulting clinician and to fill their prescriptions on time to avoid treatment interruption.^{1 404}

• Importance of informing patients not to take sotalol tablets or oral solution 2 hours before or after administration of an antacid containing aluminum oxide or magnesium hydroxide (e.g., Maalox, Mylanta).^{1 403 404}

• Importance of immediately reporting to their clinician any conditions, concomitant therapy (e.g., diuretics), and/or manifestations associated with altered electrolyte balance (e.g., severe or prolonged diarrhea, unusual sweating, vomiting, loss of appetite, excessive thirst).^{1 403 404}

• Importance of informing clinicians of existing or contemplated concomitant therapy, including prescription and OTC drugs, as well as any concomitant illnesses.¹

• Importance of women informing clinicians if they are or plan to become pregnant or plan to breast-feed.¹

• Importance of informing patients of other important precautionary information. (See Cautions.)

Preparations

Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.

Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.

* available from one or more manufacturer, distributor, and/or repackager by generic (nonproprietary) name

Frequently asked questions

• What's the difference between Sotalol and Sotalol AF?

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