They can be treated
Post-marketing serious cardiovascular, cerebrovascular, and vascular adverse events were reported in temporal association with sildenafil use and include myocardial infarction, sudden cardiac death, ventricular arrhythmia, cerebrovascular hemorrhage, transient ischemic attack, hypertension, subarachnoid and intracerebral hemorrhages or intracranial bleeding, and pulmonary hemorrhage
To examine if ammonia-induced increases in extracellular glutamate were mediated by excitatory amino-acid transporters, the reverse dialysis of ammonia, the glutamate transporter inhibitor, DL- threo - -benzyloxyaspartic acid (TBOA), or the combination of the two directly into the striatum of awake, freely moving rats was conducted
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