What does "Nitroglycerin sublingual p.r.n." mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
"Nitroglycerin sublingual p.r.n." is a medical instruction for taking a specific type of heart medication. "Nitroglycerin" is the name of the drug, which is used to treat chest pain. "Sublingual" means that the medication is placed under the tongue to be absorbed. "P.r.n." is a term that means "as needed," so the medication should be taken when symptoms occur, not on a regular schedule.
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