👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Pharmacological Therapies🔖 Free to read, print, and share
Also known as: nitro · NTG · Nitrostat · Nitro-Dur
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Use this quick-reference guide to spot, treat, and prevent Nitroglycerin on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Use
Vasodilator → ↓preload, chest pain
SL q5min ×3, then 911
📌 Hold
SBP < 90 → hold/notify
No ED drugs ×24-48h (sildenafil)
📌 Effects
Headache, flushing, dizzy
Hypotension, reflex tachy
🎓 Teach
Sit/lie before taking
Store dark glass, replace q6mo
Tingling = drug is active
📚 Nitroglycerin — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Nitroglycerin is a nitrate vasodilator used for acute angina, chest pain, and acute coronary syndrome. It dilates veins (reducing preload) and coronary arteries, lowering myocardial oxygen demand and relieving ischemic pain. Memory aid: nitrates dilate, so blood pressure deflates.
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Key points
Understand these first
Sublingual dose: one tablet every 5 minutes for up to 3 doses; call EMS if pain unrelieved after the first dose (current AHA guidance).
Causes vasodilation, so headache, flushing, hypotension, and reflex tachycardia are expected effects.
Tablets are light- and heat-sensitive; stored in the original dark glass bottle and replaced every 3-6 months.
Transdermal patches require a 10-14 hour nitrate-free interval daily to prevent tolerance.
Contraindicated with phosphodiesterase-5 inhibitors (sildenafil, tadalafil, vardenafil) due to life-threatening hypotension.
IV nitroglycerin must be given with non-PVC tubing because PVC absorbs the drug.
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Nursing priorities
What to do, in order
Assess blood pressure before and after each dose; hold and notify provider if systolic below 90 mmHg.
Have the patient sit or lie down before sublingual administration to prevent falls from hypotension.
Remove an old transdermal patch before applying a new one and rotate sites, wearing gloves to avoid self-absorption.
Continuously monitor blood pressure and titrate IV infusions per pain and pressure response.
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Red flags — report now
Escalate immediately
Never give with sildenafil or other PDE-5 inhibitors taken within 24-48 hours, severe hypotension can result.
Report systolic BP below 90 mmHg, worsening or unrelieved chest pain, or syncope immediately.
Reflex tachycardia or signs of right ventricular MI (preload-dependent) warrant holding nitrates and notifying the provider.
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Patient teaching
What patients must know
Expect a transient throbbing headache and tingling under the tongue; this confirms potency, not allergy.
Sit down and take one tablet; if pain persists after 5 minutes, call 911, then may repeat up to 3 doses total.
Rise slowly from sitting or lying to prevent dizziness and falls (orthostatic hypotension).
Keep tablets in the original amber glass bottle, away from light and heat, and replace as directed.
Avoid alcohol and erectile dysfunction drugs, which intensify the blood-pressure-lowering effect.
❓ Nitroglycerin: NCLEX FAQs
What are the priority nursing interventions for Nitroglycerin?
Assess blood pressure before and after each dose; hold and notify provider if systolic below 90 mmHg. Have the patient sit or lie down before sublingual administration to prevent falls from hypotension. Remove an old transdermal patch before applying a new one and rotate sites, wearing gloves to avoid self-absorption. Continuously monitor blood pressure and titrate IV infusions per pain and pressure response.
What are the warning signs of Nitroglycerin a nurse must report?
Never give with sildenafil or other PDE-5 inhibitors taken within 24-48 hours, severe hypotension can result. Report systolic BP below 90 mmHg, worsening or unrelieved chest pain, or syncope immediately. Reflex tachycardia or signs of right ventricular MI (preload-dependent) warrant holding nitrates and notifying the provider.
What do I need to know about Nitroglycerin for the NCLEX?
Sublingual dose: one tablet every 5 minutes for up to 3 doses; call EMS if pain unrelieved after the first dose (current AHA guidance). Causes vasodilation, so headache, flushing, hypotension, and reflex tachycardia are expected effects. Tablets are light- and heat-sensitive; stored in the original dark glass bottle and replaced every 3-6 months. Transdermal patches require a 10-14 hour nitrate-free interval daily to prevent tolerance.
What patient teaching is important for Nitroglycerin?
Expect a transient throbbing headache and tingling under the tongue; this confirms potency, not allergy. Sit down and take one tablet; if pain persists after 5 minutes, call 911, then may repeat up to 3 doses total. Rise slowly from sitting or lying to prevent dizziness and falls (orthostatic hypotension). Keep tablets in the original amber glass bottle, away from light and heat, and replace as directed.
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Quick Tip
Sublingual dose: one tablet every 5 minutes for up to 3 doses; call EMS if pain unrelieved after the first dose (current AHA guidance).