D (drug caution code)

D (drug caution code): Abbreviation on a medication that indicates caution because the medication may cause drowsiness. While not a part of the historical heritage of ancient prescription abbreviations, drug caution codes provide very valuable warnings. If you see a caution code on a prescription, talk to your pharmacist about it before using the medicine. In the United States and some other countries, a system of stickers with pictographs is also used to warn of side effects such as drowsiness.