Subq: Abbreviation for subcutaneous. Subcutaneous means under the skin. It implies just under the skin. With a subcutaneous injection, a needle is inserted just under the skin. A drug (for example, insulin) can then be delivered into the subcutaneous tissues. After the injection, the drug moves into small blood vessels and the bloodstream. The subc... Found on http://www.medterms.com/script/main/art.asp?articlekey=8266