Calcium channel blockers are indicated for which of the following conditions besides angina?

Calcium channel blockers are primarily used to manage cardiovascular conditions by inhibiting the influx of calcium ions into heart and vascular smooth muscle cells. This mechanism leads to relaxation of blood vessels, reduced heart rate, and decreased contractility, making them effective for various conditions beyond angina.

Specifically, calcium channel blockers are indicated for arrhythmias, as they can help restore a normal heart rhythm by slowing conduction through the atrioventricular node. They are also valuable in treating hypertension because they promote vasodilation, thereby lowering blood pressure. This dual effectiveness in managing both arrhythmias and hypertension highlights their broader therapeutic role in cardiovascular health.

In contrast, the other conditions listed in the options do not typically involve the use of calcium channel blockers. Respiratory distress and allergies are more commonly addressed with bronchodilators and antihistamines, while diabetes and obesity have their own specific treatment protocols that do not include calcium channel blockers. Headaches and migraines are generally managed with specific analgesics or migraine-specific medications, not calcium channel blockers.