Is NAC Safe with Nitroglycerin?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Avoid combining high-dose intravenous NAC with nitroglycerin in clinical settings without hemodynamic monitoring. Outpatient oral NAC supplementation with routine nitroglycerin use should be flagged to a cardiologist. Monitor blood pressure and report dizziness or fainting.
Why this interaction occurs
NAC acts as a thiol donor that potentiates the vasodilatory effects of nitroglycerin by facilitating nitric oxide release and preventing nitrate tolerance. While this combination has been studied therapeutically, it significantly enhances nitroglycerin-induced hypotension and headaches, particularly with parenteral NAC at high doses used clinically.
Evidence
Evidence level: strong.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 41,744 reports mentioning Nitroglycerin. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Nitroglycerin + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All NAC interactions → · All Nitroglycerin interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.