In Rowntree v. Hunsucker, 833 S.W.2d 103, 108 (Tex. 1992), the plaintiff alleged that the doctor did not diagnose, monitor, and otherwise properly treat her occluded artery when he treated and prescribed medication for her high blood pressure. 833 S.W.2d at 104. This Court had to determine if the plaintiff's taking the prescribed medication created a course of treatment absent any other office visits or medical services. Rowntree, 833 S.W.2d at 104. The Court concluded there was no course of treatment because the plaintiff's allegation was her doctor breached a duty to perform certain exams that would have detected the occluded artery. Rowntree, 833 S.W.2d at 108. Thus, we held that limitations began to run on the last date the doctor actually saw the plaintiff and had the opportunity to perform his alleged duties. Rowntree, 833 S.W.2d at 108.