Why some heart medicines stop working over time
Organic Nitrate Therapy, Nitrate Tolerance, and Nitrate-Induced Endothelial Dysfunction: Emphasis on Redox Biology and Oxidative Stress
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Some heart medicines like nitroglycerin work at first by releasing a gas that opens blood vessels, but over time they make too much harmful rust-like stuff in the body, which breaks their own mechanism. But one medicine, PETN, actually helps clean up that rust instead.
Surprising Findings
Nitroglycerin doesn’t just lose effectiveness—it actively harms blood vessels by generating peroxynitrite and disabling ALDH-2, turning a lifesaving drug into a contributor to vascular disease.
People assume all nitrates are equal—this shows GTN and ISMN are toxic over time, while PETN is protective, challenging the idea that all 'nitrates' are interchangeable.
Practical Takeaways
If you’re on long-term nitroglycerin or ISMN, ask your doctor about switching to PETN or adding hydralazine or antioxidant supplements like vitamin C or BH4.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Some heart medicines like nitroglycerin work at first by releasing a gas that opens blood vessels, but over time they make too much harmful rust-like stuff in the body, which breaks their own mechanism. But one medicine, PETN, actually helps clean up that rust instead.
Surprising Findings
Nitroglycerin doesn’t just lose effectiveness—it actively harms blood vessels by generating peroxynitrite and disabling ALDH-2, turning a lifesaving drug into a contributor to vascular disease.
People assume all nitrates are equal—this shows GTN and ISMN are toxic over time, while PETN is protective, challenging the idea that all 'nitrates' are interchangeable.
Practical Takeaways
If you’re on long-term nitroglycerin or ISMN, ask your doctor about switching to PETN or adding hydralazine or antioxidant supplements like vitamin C or BH4.
Publication
Journal
Antioxidants & Redox Signaling
Year
2015
Authors
A. Daiber, T. Münzel
Related Content
Claims (6)
Your body uses a specific enzyme called ALDH-2 to turn nitroglycerin (a heart medicine) into something that helps relax blood vessels. But if your body is under stress and produces too many harmful molecules, this enzyme gets blocked — which is why the medicine stops working as well over time.
When too much nitrate messes up your blood vessels, taking antioxidants like vitamin C or BH4 can fix it—this suggests that harmful molecules called free radicals are what’s really breaking down your blood vessel function.
Taking nitroglycerin for a long time can make your blood vessels produce too many harmful molecules, which stops the drug from working properly and makes your blood vessels less healthy—this is why the medicine stops helping over time.
A medicine called PETN doesn’t make your blood vessels lose their responsiveness over time like other similar drugs do—because it triggers your body to make protective molecules that shield your blood vessels from damage and keep them working well.
Taking ISMN for a long time might harm your blood vessels by making them more stressed and less able to function properly, not because of how your body usually breaks down the drug, but because it triggers two specific harmful processes in the vessel walls.