s.o.s means what?

• A. gtt.
• B. at once
• C. mL
• D. stat

Answer: (B)

S.O.S signals immediate action for administration—do it at once. It’s about how quickly the medication should be given, not what form it takes or how much to give. Gtt. refers to drops, mL is a volume measurement, and stat is another urgent cue, but here the shorthand S.O.S is interpreted as an instruction to act without delay, i.e., at once. In practice, always confirm your institution’s approved abbreviations to avoid confusion, but the intended meaning in this context is a prompt, immediate dose.