In the context of medicine, "HS" is an abbreviation used to indicate the timing of medication administration. It stands for "hora somni" in Latin, which translates to "at bedtime" in English.
When a doctor or healthcare provider prescribes medication with the instruction to take it "HS," it means the patient should take the medication just before going to bed or at their usual bedtime. It's a specific time designation to help ensure that the medication is taken consistently and as directed, which can be particularly important for medications that have a sedative effect or are meant to be taken at a particular time of day to optimize their efficacy.
It's important to follow your healthcare provider's instructions carefully when taking medication, including any specific timing such as "HS." If you have any doubts or questions about your medication regimen, don't hesitate to ask your doctor or pharmacist for clarification.