What is the primary approved use of dipyridamole?

The primary approved use of dipyridamole is to prevent embolization, particularly in combination with warfarin. Dipyridamole works as an antiplatelet agent by inhibiting platelet aggregation. When used alongside warfarin, which is an anticoagulant, dipyridamole enhances the effectiveness of treatment by providing dual mechanisms for preventing blood clot formation and subsequent embolization, especially after certain cardiac procedures or in patients with specific types of heart valve replacements.

The other options do not align with the primary indication for dipyridamole. It is not used to directly reduce blood pressure, manage cholesterol levels, or prevent heart failure, as these conditions require different pharmacological approaches and treatments. By understanding its specific use in conjunction with warfarin, it becomes clear why preventing embolization is the correct answer.