Valproic Acid Concentration Drops With Ketogenic Diet

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Valproic Acid Concentration Drops With Ketogenic Diet
Valproic Acid Concentration Drops With Ketogenic Diet

THURSDAY, June 22, 2017 (HealthDay News) -- For patients with epilepsy, anti-epileptic drug serum concentrations remain stable during the ketogenic diet (KD), apart from those of valproic acid, according to a study published online June 18 in the Journal of Clinical Pharmacy and Therapeutics.

G. Heo, Pharm.D., from Yonsei University in Incheon, South Korea, and colleagues examined the potential effects of KD and other dietary therapies in patients with epilepsy. Before and during the treatment, the authors assessed the mean serum concentrations and mean serum concentrations per weight per daily dose per bioavailability of anti-epileptic drugs. Data were included for 139 patients (81 males; median age, 2.91 years).

The researchers found that the serum concentrations of carbamazepine, lamotrigine, levetiracetam, topiramate, and valproic acid decreased after the dietary therapies, while there was a slight increase in phenobarbital. The difference was only statistically significant for valproic acid (P < 0.05). Significant decreases were seen in the serum concentrations per weight per daily dose per drug bioavailability for valproic acid and phenobarbital (P < 0.05). There was a significant increase in the rate of occurrence of events out of reference ranges with valproic acid (36.08 versus 57.23 percent; P < 0.05).

"Most anti-epileptic drug serum concentrations remained stable during the KD and other related dietary therapies except those of valproic acid," the authors write. "Therefore, serum concentrations of valproic acid should be monitored when the KD and other dietary therapies are concomitantly administered."

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