Epilepsy (history of convulsions or w/ predisposing factors). Avoid concomitant use of N-methyl-D-aspartate (NMDA)-antagonists eg, amantadine, ketamine or dextromethorphan. Monitor for some factors that may raise urine pH. Patients w/ recent MI, uncompensated CHF (NYHA III-IV) or uncontrolled HTN. Fructose intolerance (contains sorbitol). May impair ability to drive or operate machinery. Not recommended in severe hepatic impairment. Not to be used during pregnancy & lactation. Not recommended in childn <18 yr.
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