Recent use (within several days) of PDE-5 inhibitors (eg, avanafil, sildenafil, tadalafil, or vardenafil) may cause dangerously low hypotension; the time course of the interaction appears to be related to the PDE-5 inhibitor half-life
Riociguat; coadministration may cause hypotension
Narrow angle glaucoma (controversial: may not be clinically significant)
Increased intracranial pressure
Circulatory failure or shock
Congestive Heart Failure,
increased ICP (eg, head trauma, cerebral hemorrhage; potential contraindication),
increased IOP, postural hypotension, volume depletion, low systolic BP
**Severe hypotension may occur with small doses especially in patients with constrictive pericarditis, aortic or mitral stenosis, volume depleted patients or that are already hypotensive; hypotension may be accompanied by paradoxical bradycardia and/or increased angina pectoris
**Treat drug-induced headache with aspirin or acetaminophen
**Provide nitrate-free interval (10-12 hr or overnight) to avoid development of tolerance; excessive use my lead to development of tolerance
**Inability to relieve chest pain after 3 doses may mean AMI-rush to ER if possible
Enhances bioavailability of dihydroergotamine. Glyceryl trinitrate infusion may prolong pancuronium-induced neuromuscular blockade. May reduce the efficacy of heparin, alteplase and noradrenaline when used together.
Efficacy of buccal and sublingual preparations may be reduced by drugs that can cause dry mouth due to decreased dissolution. Aspirin and other NSAIDs may reduce the therapeutic response to glyceryl trinitrate. Potentially Fatal: Orthostatic hypotension may be produced by combined use of calcium channel blockers, antihypertensives, phenothiazines and TCAs. Alcohol may cause severe hypotension and collapse.