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| Other names | SIN-1 |
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| Formula | C6H10N4O2 |
| Molar mass | 170.172 g·mol−1 |
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Linsidomine (3-morpholinosydnonimine or SIN-1 [1] ) is a vasodilator. It is a metabolite of the antianginal drug molsidomine and acts by releasing NO from the endothelial cells nonenzymatically. It also hyperpolarizes the cell membrane through influencing the sodium-potassium pump and thereby rendering it less responsive to adrenergic stimulation. Linsidomine injection at a dose of 1 mg produces usable erection [2] in about 70% of patients and full erection in up to 50% of patients. Linsidomine does not appear to be associated with priapism.[ citation needed ]
Linsidomine is neurotoxic and promotes oxidative stress on neurons. [3] Linsidomine is a peroxynitrite-generating compound involved in the pathogenesis of neurodegenerative diseases. [4]