All of these side effects of angiotensin receptor blockers (ARB$) except:

A) "My heart rate may increase":
Digoxin is primarily used to slow the heart rate, not increase it. One of its actions is to increase the force of contraction of the heart while slowing the conduction through the atrioventricular (AV) node, which typically leads to a decreased heart rate. An increase in heart rate would be an unusual side effect and might indicate digoxin toxicity or another underlying issue.

B) "My vision may get blurred":
A common side effect of digoxin toxicity is visual disturbances, which may include blurred vision, yellow-green halos, or other color vision abnormalities. These symptoms are often associated with elevated digoxin levels in the blood and are a hallmark sign of toxicity.

C) "I may have constipation after taking this medication":
Constipation is not a typical side effect of digoxin. While some medications may cause constipation, this is not a primary or common side effect of digoxin. If constipation occurs, it may be due to other factors, such as diet, other medications, or a comorbid condition.

D) "My abdomen may hurt after taking this medication":
Although abdominal discomfort can be a side effect of many medications, it is not a primary or typical side effect of digoxin. If the patient experiences abdominal pain, it could be related to digoxin toxicity, especially if accompanied by other symptoms like nausea, vomiting, or diarrhea.

A) Vomiting:
Vomiting is a common symptom of digoxin toxicity. It occurs as a result of the toxic effects of digoxin on the gastrointestinal system. It is often one of the first symptoms that precede more severe signs of toxicity, such as arrhythmias and changes in vision. Vomiting, nausea, and anorexia are classic early signs of digoxin toxicity.

B) Nausea:
Nausea is another early sign of digoxin toxicity. It occurs due to the direct effects of the drug on the gastrointestinal tract and the central nervous system. Along with vomiting, nausea is a frequently observed symptom and often occurs before more severe manifestations like arrhythmias or confusion.

C) Blurred Vision:
Blurred vision, or seeing yellow or green halos around lights, is a hallmark sign of digoxin toxicity. This visual disturbance occurs due to the effect of digoxin on the optic nerve and the retina. This symptom is particularly important in identifying digoxin toxicity, as it is not commonly seen in other conditions.

D) Headache:
While headache may occur in a variety of clinical conditions, it is not typically a direct symptom of digoxin toxicity. Although some patients may experience headache due to general discomfort or the effects of vomiting and nausea, it is not a classic or primary indicator of digoxin toxicity. Therefore, headache is not as strongly associated with digoxin toxicity as vomiting, nausea, and blurred vision are.
E) Muscle aches:
Muscle aches are not a typical symptom of digoxin toxicity. While generalized weakness may occur due to the cardiac effects of digoxin, muscle aches are not specifically associated with toxicity.