Terbutaline sulfate injection was drawn up into plastic tuberculin syringes and stored under four conditions: exposed to ambient (fluorescent) light at room temperature (23-25 degrees C) and under refrigeration (2-8 degrees C) and protected from light at room temperature and under refrigeration. The terbutaline sulfate content was determined one, two, three, four, five, six, and seven weeks after initial storage. The analytical method employed was the United States Pharmacopoeia XXI colorimetric procedure. Under all four storage conditions terbutaline sulfate concentration was greater than 90 percent of initial concentration at all time periods.