Epilepsy Drug Linked to Low IQ

[Birdbomb]

http://www.medicinenet.com/script/ma...ticlekey=80910

Epilepsy Drug Linked to Low IQ
Children Whose Moms Took Valproate During Pregnancy More Likely to Have Lower IQs

By Charlene Laino
WebMD Medical News

Reviewed By Louise Chang, MD

May 3, 2007 (Boston) -- Women of childbearing age should avoid taking the commonly prescribed epilepsy drug valproate because of a negative effect on their children's IQ, researchers say.

They found that the intelligence quotient of 2-year-old children was an average of 12 points lower when expectant moms took valproate compared with three other drugs -- Lamictal, carbamazepine, or phenytoin.

In addition, 24% of toddlers born to mothers who took valproate had IQ scores that would put them in the mental retardation range -- that is, below 70 points on the standard IQ test, says Kimford Meador, MD, professor of neurology at the University of Florida in Gainesville.

That compares unfavorably with 9% to 12% for the other drugs, he says.

Valproate -- sold under the brand names Depakote, Depakene, and Depacon -- is one of the oldest and most widely prescribed antiseizure medications on the market.

The three other drugs studied are also widely used: Lamictal; carbamazepine, for which a common brand name is Tegretol; and phenytoin, often sold as Dilantin.

Two more recently approved drugs for epilepsy, Keppra and Topamax, have not been studied with regard to children's IQ, according to Meador.

"We really can't say which drug is best to use in pregnancy, but we can say that valproate should not be used as the first drug of choice by women with epilepsy during childbearing years if at all possible," Meador tells WebMD.

"That said, valproate remains an important treatment option in women who aren't helped by other epilepsy drugs," he says.

If valproate is the only drug that controls a woman's seizures, Meador recommends using the lowest dose possible.

The study was presented here at the annual meeting of the American Academy of Neurology.

Damage During Third Trimester
For the study, Meador and colleagues conducted IQ tests on 187 2-year-olds born to women who had been taking epilepsy drugs.

Meador notes that hundreds of thousands of women of childbearing potential take valproate not only for epilepsy, but also for bipolar disorder and chronic headaches.

Despite the fact that earlier studies also hinted at a negative impact on IQ and found that the drug can cause birth defects, sales went up 20% last year, he says.

The negative impact on IQ occurs in the third trimester, Meador believes. "It's similar to fetal alcohol syndrome. Exposure of the immature third-trimester neonatal brain results in cell loss that is associated with widespread cognitive defects," he explains.

Despite the findings, Meador stresses that pregnant women taking valproate should not just stop taking the drug. "It can be dangerous to switch therapies mid-pregnancy. Talk to your doctor," he says.

Cynthia Harden, MD, professor of neurology at New York Presbyterian-Weill Cornell Medical Center in New York, says though valproate has been linked to lower verbal IQs in the past, the current study was much better designed.

"If we can take a woman off valproate safely as far as seizure control, then we should try not to use it," she tells WebMD.

[Bernard]

Interesting, but not entirely surprising given the recent publicity about the link between valproate and autism.

[Birdbomb]

I am glad my childbearing years are done. It's frightening to think of conceiving a child on any anti-epileptic drug.

[1096]

affect sperm?

[Birdbomb]

1096,

I don't know if these drug studies check on the little spermies, but it's the drugs in the mother's system that does the worst damage. :wink:

[Bernard]

I'm not aware of any studies on anti-epileptic drugs and "swimmers".

[1096]

any studies suggesting sodium valproate can lower the iq of the person taking the medication? or any other anti-epileptic drugs for that matter?

[epileric]

I was on it for decades so it is a little bit of a concern for me.

[Cint]

I was taking Dilantin during both pregnancies and both of my children turned out with High IQs. Both made the Dean's list in college.
Cindy

[Belinda5000]

IDoes anyone know if the meds are supposedly suppose to affect intelligence in childr since they've been taken anti-epileptic drugs since early chilhood?
they always gave me IQ test in elementary school every year.

Belinda

[xenome]

Im confused, how do you do an IQ test on a 2 year old. They dont know anything...