Anti-epileptic drug valproate (VPA) should not be used by women of child-bearing age as it could have harmful effects on the baby a British expert said on Sunday. Valproic acid is used worldwide as an anti-convulsant (seizure prevention) and studies in the Britain Ireland US and Europe have shown it could have potential birth (teratogenic) effects. (Read: Top myths about epilepsy busted) 'There is a lot of evidence that show VPA has teratogenic effects. It can significantly impact children's cognitive development and has higher risk of impairment. The most important message would be to avoid the drug in women of