PREGNANCY AND BREASTFEEDING SAFETY:
- There are no adequate studies in pregnant women.
- Digoxin in secreted in breast milk at concentrations similar to concentrations in the mothers blood. However, the total amount of digoxin that will be absorbed from breast milk by the infant may not be enough to cause effects. Caution should be exercised by nursing mothers who are taking digoxin.
- Tablets: 0.0625, 0.125, 0.1875, and 0.25 mg; Elixir: 0.05 mg/ml.
- Injectable Solution: 0.1 and 0.25 mg/ml.
STORAGE: Digoxin should be stored at room temperature, 15 C and 30 C) (59 F and 86 F) and protected from light.
DRUG CLASS AND MECHANISM:
- Digoxin increases the strength and efficiency of heart contractions, and is useful in the treatment of heart failure and control the rate and rhythm of the heart. It is extracted from the leaves of a plant called digitalis lanata. Digoxin increases the force of contraction of the muscle of the heart by inhibiting the activity of an enzyme (ATPase) that controls movement of calcium, sodium, and potassium into heart muscle. Calcium controls the force of contraction. Inhibiting ATPase increases calcium in heart muscle and therefore increases the force of heart contractions. Digoxin also slows electrical conduction between the atria and the ventricles of the heart and is useful in treating abnormally rapid atrial rhythms such as atrial fibrillation, atrial flutter, and atrial tachycardia. (Abnormally rapid atrial rhythms can be caused by heart attacks, excessive thyroid hormones, alcoholism, infections, and many other conditions.) During rapid atrial rhythms, electrical signals from the atria cause rapid contractions of the ventricles. Rapid ventricular contractions are inefficient in pumping blood containing oxygen and nutrients to the body, causing symptoms of weakness, shortness of breath, dizziness, and even chest pain. Digoxin alleviates these symptoms by blocking the electrical conduction between the atria and ventricles, thus slowing ventricular contractions.
- The FDA approved digoxin in 1975.
REFERENCE: FDA Prescribing Information
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