Generic name: Digoxin.

Other brand names: Lanoxicaps.

Lanoxin is a cardiac glycoside. It strengthens the heartbeat and improves the rhythm and contraction of the heart by working on the heart muscle. 

Quick Facts About Lanoxin


Used to treat congestive heart failure, irregular heartbeat, and other heart problems.

Lanoxin Dosage

Take at the same time each day and on an empty stomach. Avoid high-bran/high-fiber foods. If using liquid form, use dropper that comes with the prescription. Medication should not be stopped unless your doctor advises you. Abrupt discontinuance may cause serious heart problems. Most patients taking Lanoxin do so for an extended period of time or for the rest of their lives. Do not switch brands unless directed by your doctor.

  • Usual adult dose: 0.125 milligram or 0.25 milligram tablet one time per day. Exact dose is based on your individual needs.
  • Usual child dose: Infants and young children — daily dose is divided into smaller doses. Children ages 10 and over — prescribed adult doses in proportion to body weight.
  • Missed dose: take as soon as possible, if within 12 hours of scheduled dose. Otherwise, do not take missed dose; go back to regular schedule. If you miss doses for 2 or more days, consult your doctor. Do not double doses.

Lanoxin Side Effects

Overdose symptoms:

abdominal pain, diarrhea, irregular heartbeat, loss of appetite, nausea, very slow pulse, vomiting. If you suspect an overdose, immediately seek medical attention.

More common side effects: apathy, blurred vision, breast development in males, change in heartbeat, diarrhea, dizziness, headache, loss of appetite, lower stomach pain, nausea, psychosis, rash, vomiting, weakness, yellow vision.

No known less common or rare Lanoxin side effects.


Inform your doctor before combining Lanoxin with:

airway-opening medications such as Proventil and Ventolin; alprazolam (Xanax); amiloride (Midamor); amiodarone (Cordarone); antacids such as Maalox and Mylanta; anti-arrhythmic medications (Quinidex); antibiotics such as neomycin and tetracycline; betablockers such as Tenormin and Inderal; calcium (injectable); calcium blockers such as Calan SR, Cardizem, Procardia; certain anticancer medications (Neosar); cholestyramine (Questran); colestipol (Colestid); cyclosporine (Sandimmune); diphenoxylate (Lomotil); disopyramide (Norpace); diuretics (Lasix); indomethacin (Indocin); itraconazole (Sporanox); kaolin-pectin; metoclopramide (Reglan); propafenone (Rythmol); propantheline (Pro-Banthine); rifampin (Rifadin); steroids such as Decadron and Deltasone; succinylcholine (Anectine); sucralfate (Carafate); sulfasalazine (Azulfidine); thyroid hormones (Synthroid).

Unless directed by your doctor, avoid over-the-counter medications such as antacids; laxatives; cough, cold, and allergy medications; and diet products. 

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Appears in breast milk; could affect a nursing infant.

No special precautions apply to seniors.

Follow doctor’s instructions carefully for children.

  • Monitor pulse rate while taking Lanoxin. Effective dosage level is close to level that causes serious overdose problems.
  • If sensitive to or allergic to this or other digitalis preparations, should not take.
  • Should not be used if you have ventricular fibrillation, or for weight reduction; may cause irregular heartbeat or death.
  • Notify your doctor that you are taking this medication in the event of a medical emergency, surgery, or dental treatment.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Lanoxin side effects, please contact your healthcare provider.