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Table 10 Rates of adverse effects regardless of the severity and the rate of severe adverse effects for treatments perceived to be most effective.

From: Traditional and non-traditional treatments for autism spectrum disorder with seizures: an on-line survey

  Number of Adverse Effects Number of Severe Adverse Effects
Treatment One Two Three One Two Three
Valproic Acid 48% 25% 11% 15% 4% 5%
Lamotrigine 34% 19% 12% 16% 3% 1%
Levetiracetam 43% 19% 10% 16% 2% 3%
Ethosuximide 26% 7% 7% 7% 0% 4%
Ketogenic Diet 27% 13% 4% 8% 0% 2%
Atkin's Diet/Modified Atkin's Diet 15% 0% 0% 0% 0% 0%
Gluten-free Casein-free Diet 6% 2% 1% 3% 1% 0%
Hyperbaric Oxygen Therapy 10% 6% 4% 6% 0% 2%