Heparin and Nitroglycerin: Drug Interaction Guide

Quick answer: This combination requires caution. Heparin and Nitroglycerin can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Heparin interacts with Nitroglycerin

Intravenous nitroglycerin may reduce the anticoagulant response to heparin, possibly through propylene glycol vehicle effects on antithrombin or altered heparin clearance.

What you should do

Monitor aPTT more frequently when starting or stopping IV nitroglycerin and adjust heparin infusion accordingly to maintain target range.

Key facts

Severity

Moderate — caution required

Mechanism

Intravenous nitroglycerin may reduce the anticoagulant response to heparin, possibly through propylene glycol vehicle ef...

Action

Monitor aPTT more frequently when starting or stopping IV nitroglycerin and adjust heparin infusion accordingly to maint...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Heparin and Nitroglycerin together?

With caution. Monitor aPTT more frequently when starting or stopping IV nitroglycerin and adjust heparin infusion accordingly to maintain target range.

What is the severity of this interaction?

The interaction between Heparin and Nitroglycerin is classified as Moderate — caution required. Intravenous nitroglycerin may reduce the anticoagulant response to heparin, possibly through propylene glycol vehicle effects on antithrombin or altered heparin clearance.

What should I do if I'm prescribed both?

Monitor aPTT more frequently when starting or stopping IV nitroglycerin and adjust heparin infusion accordingly to maintain target range. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.