Digoxin

Generic Name: Digoxin

Brand Names: Lanoxin

Digoxin is used to treat heart failure and atrial fibrillation. It is available as Lanoxin and is commonly prescribed in the cardiovascular category.

CardiovascularHeart FailureArrhythmia

Drug Class

Cardiac Glycoside (Na⁺/K⁺-ATPase Inhibitor)

Pregnancy

Category C — Animal reproduction studies are inadequate, and digoxin readily crosses the placenta. It has been used during pregnancy to treat fetal supraventricular tachycardia and maternal arrhythmias when benefits outweigh risks. Maternal serum levels should be monitored carefully because of altered pharmacokinetics during pregnancy.

Available Forms

Oral tablet (62.5 mcg, 125 mcg, 187.5 mcg, 250 mcg), Oral solution (50 mcg/mL pediatric), IV injection (100 mcg/mL, 250 mcg/mL)

What It's Used For

Digoxin is prescribed to treat:

• Heart failure and atrial fibrillation • Various related conditions in the cardiovascular category • Associated symptoms and complications

It is an important medication that helps manage these conditions effectively.

Dosage Quick Reference

These are general dosage guidelines. Your doctor will determine the appropriate dose for your specific situation.

Condition	Starting Dose	Maintenance Dose
Heart failure (chronic, normal renal function)	125–250 mcg orally once daily	125–250 mcg once daily; target serum level 0.5–0.9 ng/mL
Heart failure (older adults or CrCl 30–50 mL/min)	62.5–125 mcg orally once daily	62.5–125 mcg once daily with serum level monitoring
Atrial fibrillation rate control (chronic)	250 mcg orally once daily	125–250 mcg once daily; titrate to ventricular rate < 110 bpm at rest
Atrial fibrillation (acute IV loading)	0.25 mg IV every 2 hours, max 1.5 mg in 24 hr	Transition to oral maintenance

Side Effects

Common side effects may include:

• Nausea or stomach upset • Headache • Dizziness or lightheadedness • Fatigue or tiredness • Mild rash or itching

Serious side effects (seek immediate medical attention):

• Severe allergic reactions (rash, hives, swelling, difficulty breathing) • Unusual bleeding or bruising • Severe stomach pain • Signs of liver problems (yellowing of skin/eyes, dark urine) • Chest pain or irregular heartbeat • Severe dizziness or fainting • Signs of serious adverse effects

Drug Interactions

Digoxin has a narrow therapeutic index, and many common medications can raise its serum concentration into the toxic range.

Amiodarone, dronedarone, verapamil, quinidine, propafenone: All inhibit P-glycoprotein-mediated digoxin clearance, raising digoxin levels by 50% to 100%. Reduce digoxin dose by approximately 50% when these are co-administered and recheck a serum digoxin level within one week.
Loop and thiazide diuretics (e.g., furosemide, hydrochlorothiazide): Cause hypokalemia and hypomagnesemia, which sensitize the myocardium to digoxin and increase the risk of arrhythmias even at therapeutic digoxin concentrations. Monitor and replete electrolytes proactively.
Macrolide antibiotics (e.g., clarithromycin, erythromycin): Eliminate gut flora that metabolize digoxin and inhibit P-glycoprotein, sharply increasing absorption and levels. Monitor digoxin levels and consider temporary dose reduction during the antibiotic course.
Spironolactone and eplerenone: Can raise digoxin concentrations and interfere with some serum digoxin assays, producing falsely elevated readings. Use clinical signs alongside laboratory levels.
Cholestyramine, colestipol, kaolin-pectin, antacids: Bind digoxin in the gut and reduce absorption. Separate administration by at least 2 hours.
Beta-blockers and non-dihydropyridine calcium channel blockers: Combined AV nodal blockade can produce excessive bradycardia or high-degree AV block. Monitor heart rate and ECG.

Additional Information

What is Digoxin?

Digoxin (generic name: Digoxin) is a medication primarily used to treat heart failure and atrial fibrillation. It is marketed under the brand name(s) Lanoxin and belongs to the Cardiovascular category of medications.

How Does Digoxin Work?

Digoxin works through several mechanisms to provide therapeutic benefits:

Acts on specific receptors or pathways in the body
Modulates biological processes related to the treated condition
Provides symptom relief and improves quality of life
Helps manage the underlying condition effectively
Works best when combined with appropriate lifestyle modifications

The medication is designed to target the specific pathways involved in heart failure and atrial fibrillation, making it an effective treatment option.

Common Uses

Primary Indications

Digoxin is commonly prescribed for:

Heart failure and atrial fibrillation: The main indication for this medication
Related Conditions: Associated symptoms and complications
Prevention: May help prevent progression of certain conditions
Symptom Management: Reduces discomfort and improves daily function

Additional Uses

In some cases, Digoxin may also be prescribed for:

Off-label uses as determined by your healthcare provider
Combination therapy with other medications
Long-term management of chronic conditions
Short-term treatment of acute symptoms

Dosage and Administration

Digoxin dosing varies based on the specific condition being treated and individual patient factors.

Typical Dosing:

Starting dose is typically determined by your healthcare provider
May be adjusted based on response and tolerability
Can be taken with or without food (follow specific instructions)
Usually taken once or twice daily

Administration Tips:

Take at the same time(s) each day for best results
Swallow tablets/capsules whole unless instructed otherwise
Don't skip doses
Complete full course of treatment as prescribed
Follow your doctor's specific instructions carefully

Important Safety Information

Who Should Not Take Digoxin?

Do not take Digoxin if you:

Are allergic to Digoxin or any ingredients
Have certain medical conditions (discuss with your doctor)
Are taking medications that interact with Digoxin
Have severe liver or kidney disease (without dose adjustment)

Drug Interactions

Inform your doctor about all medications you take, including:

Prescription medications
Over-the-counter drugs
Vitamins and supplements
Herbal products

Some medications may interact with Digoxin, affecting its efficacy or increasing side effect risk.

Pregnancy and Breastfeeding

Pregnancy:

Discuss risks and benefits with your doctor if pregnant or planning pregnancy
May require special monitoring or dose adjustments
Some medications should be avoided during pregnancy

Breastfeeding:

Consult your doctor about safety while breastfeeding
May pass into breast milk
Benefits and risks should be carefully considered

Monitoring and Follow-Up

While taking Digoxin, your doctor may monitor:

Effectiveness of treatment (symptom improvement)
Side effects or adverse reactions
Laboratory values if applicable
Blood pressure, heart rate, or other vital signs as appropriate
Overall response to therapy

Regular follow-up appointments are important to ensure the medication is working properly and to make any necessary adjustments.

Managing Side Effects

Most side effects are mild and improve with time. Here are strategies for common side effects:

Gastrointestinal Upset

Take with food if allowed
Stay well hydrated
Eat smaller, more frequent meals
Report persistent nausea or vomiting

Dizziness

Rise slowly from sitting or lying positions
Avoid sudden movements
Stay hydrated
Avoid alcohol
Report severe or persistent dizziness

Fatigue

Get adequate rest
Maintain regular sleep schedule
Exercise as tolerated
Report excessive tiredness that interferes with daily activities

Lifestyle Considerations

To maximize the benefits of Digoxin:

Follow a healthy, balanced diet
Exercise regularly as recommended by your doctor
Maintain a healthy weight
Avoid alcohol or limit consumption
Don't smoke
Manage stress through relaxation techniques
Get adequate sleep
Stay well hydrated
Keep all follow-up appointments
Take medication consistently as prescribed

When to Contact Your Doctor

Seek immediate medical attention if you experience:

Signs of severe allergic reaction (difficulty breathing, severe rash, swelling)
Chest pain or rapid heartbeat
Severe dizziness or fainting
Unusual bleeding or bruising
Signs of liver problems (yellowing of skin/eyes, dark urine, severe fatigue)
Severe stomach pain
Any symptoms that concern you

Contact your doctor for non-emergency issues:

Mild to moderate side effects that persist
Questions about your medication
Concerns about effectiveness
New medications prescribed by another doctor
Scheduled surgery or dental procedures
Planning pregnancy

Storage

Store Digoxin at room temperature (68-77°F or 20-25°C) away from light, heat, and moisture. Keep in original container. Keep out of reach of children and pets. Do not use past expiration date.

Important Reminders

Take exactly as prescribed by your doctor
Don't stop suddenly without medical advice
Keep all follow-up appointments
Report any unusual symptoms
Don't share medication with others
Store safely away from children
Check expiration dates
Ask your pharmacist if you have questions

Clinical Benefits

When used appropriately, Digoxin provides several benefits:

Effective management of heart failure and atrial fibrillation
Improvement in quality of life
Reduction in symptoms
Prevention of complications
Generally well-tolerated when used as directed
Backed by clinical research and extensive use

Disclaimer: This information is for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult your physician or other qualified healthcare provider with any questions about a medical condition or medication.

Frequently Asked Questions

Early signs include nausea, vomiting, loss of appetite, fatigue, and visual disturbances such as yellow-green halos around lights or blurred vision. More serious manifestations include confusion, palpitations, slow or irregular heart rate, and life-threatening arrhythmias. Contact your physician promptly if any of these symptoms appear, especially after a recent medication change.

Digoxin has a narrow therapeutic window — the difference between an effective dose and a toxic dose is small. Serum levels are typically drawn at least 6 to 8 hours after a dose, with a target range of approximately 0.5 to 0.9 ng/mL for most heart failure patients. Levels above 2.0 ng/mL are clearly toxic, and levels even within the "normal" range can cause toxicity if potassium or magnesium is low.

High-fiber foods (such as wheat bran) and certain herbal products — notably St. John's wort, hawthorn, and licorice — can alter digoxin absorption or effect. Separate fiber supplements from your dose by at least 2 hours, and inform your provider about any supplements before starting them.

No. Modern heart failure guidelines prioritize beta-blockers, ACE inhibitors or ARBs, mineralocorticoid receptor antagonists, and SGLT2 inhibitors as foundational therapy. Digoxin is now reserved as an add-on therapy for patients who remain symptomatic despite optimal guideline-directed treatment, or for rate control in atrial fibrillation when other agents are ineffective or contraindicated.

If you remember within 12 hours of the missed dose, take it as soon as possible. If more than 12 hours have passed, skip the missed dose and resume your normal schedule. Never take a double dose, as this dramatically increases the risk of toxicity. If you miss more than two consecutive doses, contact your provider for guidance.

Questions to Ask Your Doctor

Consider discussing these topics at your next appointment:

✓Why is digoxin being added to my regimen, and what symptoms should improve?
✓How often will my digoxin level, kidney function, and electrolytes be checked?
✓Which of my other medications interact with digoxin and might need adjustment?
✓What symptoms should make me call you or go to the emergency department?
✓Is there a heart failure or arrhythmia treatment that might work better for me with less risk?

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Related Health Conditions

This medication is commonly used to treat or manage the following conditions:

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Medical Disclaimer: This information is for educational purposes only and should not be considered medical advice. Always consult with your healthcare provider before starting, stopping, or changing any medication. Your doctor can provide personalized recommendations based on your specific health condition and medical history.