Which are the four most common toxic effects of digitalis?

The four most common toxic effects of digitalis include anorexia, nausea and vomiting, yellow vision, and arrhythmia, which align with the selected answer.

Anorexia is a prominent early sign of digitalis toxicity, often indicating that the patient may not be tolerating the medication as expected. Nausea and vomiting frequently accompany this toxicity, as the gastrointestinal system is particularly sensitive to changes in electrolyte balance and the effects of the drug. Yellow vision, or a visual disturbance characterized by the perception of yellow hues, also known as xanthopsia, is a classic symptom associated with digitalis toxicity, signaling that the drug's therapeutic window has been surpassed.

Arrhythmia is a serious concern with digitalis, as the drug affects the electrical conduction system of the heart. It can lead to various arrhythmias, which can be life-threatening, especially in patients with pre-existing heart conditions.

The other choices include symptoms that are either less common or not typically associated with digitalis toxicity. For instance, fever, chills, headache, hypertension, dehydration, confusion, tachycardia, diarrhea, bleeding, rash, and fatigue do not specifically indicate digitalis toxicity and can be linked to a range of other conditions or reactions. Hence,