Introduction
It is the one of oldest medicine in cardiology and belongs to the family of cardiac glycoside and commonly known by the brand name of Lanoxin.It was isolated from the foxglove plant digitalis lanata in the year of 1930 and the remains in the World Health Organisation List of Essential Medicine.
Main uses
It is primarily used to treat the
Atrial fibrillation
Atrial flutter
Heart Failure
Particularly helpful in controlling heart rate.
How It Works
It inhibits the sodium-Potassium ATPase pump in heart cells. This will lead to the increased intracellular calcium, Reduced heart rate, Improved Cardiac Output and tissue perfusion.
Dosing and pharmacokinetics
• The primary mode for administration is oral (125-250 mcg/day); however, IV administration is also available when necessary due to urgency.
• The half-life of digoxin is about 36 hours, but increases if the patient has renal impairment.
• Digoxin is primarily eliminated from the body by the kidneys.
• Digoxin has a narrow therapeutic index, which necessitates careful monitoring due to the potential for serious adverse reactions.
Adverse Effects & Toxicity:
There is a narrow distinction between the therapeutic dose and the toxic dose of digoxin, which increases the likelihood of developing adverse reactions if serum levels become elevated. Common adverse reactions include:
• Nausea, vomiting, and anorexia
• Visual disturbances including yellowish/blurred vision
• Confusion
• Cardiac Arrhythmias (the most significant potential adverse effect)
Individuals at increased risk for developing adverse effects include elderly patients, patients with renal dysfunction, and patients with hypokalemia (often caused by diuretics).
In the event of toxicity, specific antidotes, such as digoxin immune Fab (Digibind/Digifab), may be given to the patient to reverse the effects of digoxin.
Conclusion
The drug digoxin has been an effective long-term drug as well as a well-established drug within cardiology, especially when treating rate control in patients experiencing atrial fibrillation and patients with heart failure. Despite the introduction of new treatments, digoxin will continue to be clinically relevant when appropriately used and closely monitored. However, digoxin has a narrow therapeutic window and high risk of toxicity; therefore, individualized dosing, renal function testing, and monitoring electrolytes are essential. Properly prescribed, digoxin is an example of an older medication that will continue to have a role in current evidence-based medicine.
MBH/PS