One of its major roles is to prepare the lining of the uterus (the endometrium) to allow the embryo to implant and grow. In some of the treatment protocols progesterone is not produced by the ovary in adequate amounts, or its effect on the lining of the uterus is inadequate. This problem is called luteal deficiency. It is more common in older women and in women with abnormal ovulation.
Potassium chloride can be given orally in less serious situations or by IV in more serious situtations of potassium shortage. When given by IV, potassium chloride cannot be administered via IV push/bolus (or via IM or s.q.), because it would result in the patient receiving too much potassium too quickly; it must be diluted and infused over a certain period of time.
Why do people take potassium? Most people who eat a healthy diet should get enough potassium naturally. However, many Americans don't eat a healthy diet and may be deficient in potassium. Low potassium is associated with a risk of high blood pressure, heart disease, stroke, arthritis, cancer, digestive disorders, and infertility. For people with low potassium, doctors sometimes recommend improved diets -- or potassium supplements -- to prevent or treat some of these conditions.