In standard prescription sig abbreviations, “SL” means sublingual, indicating the route of administration (placing the medication under the tongue). It does not refer to package size, strength, or a disease state.
References (Pharmacy Technician documents / Study Guides):
• Common prescription abbreviations/sig codes used in pharmacy practice (e.g., SL = sublingual).
• PTCB/ExCPT study guides: interpretation of prescription directions and routes of administration.
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