valproic acid, divalproex, Depakote, Depakote ER, Depakene, Depacon, Stavzor (cont.)

Pharmacy Author:
Medical and Pharmacy Editor:

Cholestyramine (Questran) can reduce the absorption of valproic acid from the intestine and reduce its effectiveness. Therefore, valproic acid should be taken at least 2 hours before or 6 hours after doses of cholestyramine.

Valproic acid can significantly decrease the elimination of lamotrigine (Lamictal), ethosuximide (Zarontin), diazepam (Valium), zidovudine (AZT) and phenobarbital, thereby increasing their concentrations in blood and leading to toxicity. Valproic acid also increases the blood levels of warfarin and phenytoin by displacing them from blood proteins that they bind to. Since increased blood concentrations of these drugs may lead to an increase in side effects, the dose of warfarin and phenytoin may need to be altered when they are taken with valproic acid.

PREGNANCY: The use of valproic acid during pregnancy has been associated with fetal abnormalities such as spina bifida, cardiovascular abnormalities, and neural tube defects. The risk of spina bifida in the offspring of mothers taking valproic acid during pregnancy is 1%-2%. Valproic acid also may cause reduced clotting in the mother and baby. Because of the risk of harm to the newborn, valproic acid should only be used by pregnant women when its benefits outweigh the risks.

NURSING MOTHERS: The concentration of valproic acid in breast milk of women taking valproic acid is 1-10%. Although the effect on the nursing infant, is not certain, nursing mothers probably should not breastfeeding if they are taking valproic acid.

SIDE EFFECTS: The most common side effects with valproic acid therapy are drowsiness, dizziness, nausea, vomiting, indigestion, diarrhea, weight loss and tremors. Divalproex may have a lower incidence of stomach upset, and taking valproic acid or divalproex with food can reduce the stomach upset. Valproic acid also causes skin reactions such as alopecia (loss of hair), rash, itching and sensitivity to sunlight.



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