Divalproex sodium is primarily used in the treatment of epilepsy to control seizures, including complex partial seizures, absence seizures, and multiple seizure types. It is also effective in managing manic episodes associated with bipolar disorder, helping to stabilize mood and prevent extreme emotional highs and lows. Additionally, it is prescribed for the prevention of migraine headaches, reducing both the frequency and severity of episodes. The medication works by increasing the levels of gamma-aminobutyric acid (GABA) in the brain, which helps to calm overactive nerve signals. It is available in various forms, including tablets and extended-release formulations, to suit different patient needs. Regular monitoring of liver function and blood levels is often required during treatment to ensure safety and efficacy.