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For example, Devinsky notes that patients who are receiving valproic acid to treat seizures or migraines might be at an elevated risk.

How these medications, such as valproic acid, boost autism risk is unclear, but many of them interfere with folic acid’s metabolism and absorption from the gut into body tissues.

Researchers have suggested that damage could be done by the drugs thalidomide, misoprostol and valproic acid; by exposure to the insecticide chlorpyrifos; and by infection of the mother with the rubella virus.

So are prenatal exposures to certain infections, air pollution and some medications, such as the anti-seizure drug valproic acid, the group said.

Although the drug, valproic acid, hasn't been proven and approved for their disease, it seems to help both girls retain their strength and ability to control their movements.