X (drug Caution Code)

 
X (drug caution code): Abbreviation on a medication that indicates SOS -- that the medication contains a substance such as acetaminophen that could cause problems -- consult your pharmacist.

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.

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