Hypokalemia is a characteristic feature of toxicity with:-
First, I remember that hypokalemia, or low potassium levels, can be caused by various drugs. Diuretics like loop diuretics (e.g., furosemide) and thiazide diuretics are classic examples because they increase potassium excretion in the urine. But the question is about toxicity, so maybe it's a drug that causes toxicity leading to hypokalemia.
Wait, some drugs can cause toxicity that directly affects potassium levels. For example, digoxin toxicity is known to cause arrhythmias, but does it cause hypokalemia? Actually, hypokalemia can exacerbate digoxin toxicity, making it more dangerous. So maybe digoxin is a possible answer here.
Another angle: licorice (glycyrrhizin) can cause hypokalemia through pseudohyperaldosteronism. But is that toxicity? If someone consumes too much licorice, it can lead to hypokalemia. So licorice might be another option.
Also, amphotericin B can cause hypokalemia as a side effect. But I'm not sure if that's considered toxicity. Then there's corticosteroids, which can lead to potassium loss.
Wait, the question is about toxicity. So maybe the drug in question has toxicity that leads to hypokalemia. Let me think of the most common ones. Digoxin toxicity is a classic one where hypokalemia is a known factor that worsens the toxicity. Hypokalemia lowers the threshold for digoxin to cause arrhythmias. So if a patient is on digoxin and has hypokalemia, they're at higher risk for toxicity. Therefore, hypokalemia is a characteristic feature of digoxin toxicity.
So the correct answer would be Digoxin. The other options might include diuretics like thiazides, but those are more about causing hypokalemia through their mechanism of action rather than toxicity. However, if the options include digoxin, then that's the answer.
Let me verify. Digoxin toxicity is indeed associated with hypokalemia. The hypokalemia potentiates the effects of digoxin, leading to more severe toxicity. So the question is testing the knowledge that hypokalemia is a feature of toxicity with digoxin.
**Core Concept**
Hypokalemia is a key clinical feature in the toxicity of drugs that alter renal potassium handling or interact with cardiac ion channels. Digoxin toxicity is classically associated with hypokalemia, as low potassium levels lower the therapeutic index of digoxin, exacerbating its cardiotoxic effects.
**Why the Correct Answer is Right**
Digoxin, a cardiac glycoside, inhibits the Na⁺/K⁺-ATPase pump, increasing intracellular sodium and reducing potassium. Hypokalemia potentiates digoxin toxicity by further impairing this pump, leading to increased intracellular calcium and arrhythmias (e.g., ventricular tachycardia, AV block).