A preparation designed to treat de¬ hydration due to diarrhea. Watery diarrhea can rapidly cause a loss of body fluids and crucial body salts. Left untreated, this depletion can lead to shock. Young children and older people are particularly at risk. Oral rehydration fluid is available over-the-counter at pharmacies. It contains water, salts, and glucose. Homemade preparations can also be used. Doctors advise drinking rehydration fluid at half-hour intervals until pale-colored urine is passed. Medical attention is necessary if diarrhea continues longer than 2 days or if it is especially severe.