Sublingual nitroglycerin (NTG) or glyceryl trinirate (GTN)

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Last updated 12:30 AM on 4/26/26
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8 Terms

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Form

Suglingual tablet or spray

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Source

Must be prescribed for, and supplied by the patient

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Authorization

All EMTs

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Age

18 years and older

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Indications

Patient currently experiencing chest discomfort

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Contraindications

  • 3 does of NTG within a 15-minute period prior to or during this episode

  • Systolic BP under 100

  • Recent head injury

  • Erectile dysfunction drugs such as viagra and cialis use with 72 hours

  • NTG is expired

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Adverse effects

Headache

Cardiovascular collapse

Lightheadedness

Methemoglobinemia

Bradycardia

Flushing

Hypotension

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Administration

  • Assist with one tablet or spray under the tongue

  • Reassess chest discomfort using 1-20 pain scale and vital signs after 1-2 minutes

  • Repeat one dose of NTG every 5 minutes until a maximum of three has been administered for any on episode

  • Contact medical control if appropriate