Hi, thanks for using healthcare magic Migraine medication can be abortive (treat the present migraine) or preventative. Preventative medication is prescribed if a person has 2 or more migraines a month with disability lasting 3 or more days, failure or adverse effects of the abortive medications, use of abortive medications more than 2 times a week and uncommon migraine conditions. With 3 migraines a week , your daughter would definately qualify for preventative medications. Sodium valproate (epilim) is one of the commonly used preventative medications , but they are alot of others. If she is unable to tolerate the side effects, it may be best to speak to her doctor. He or she can change it to another preventative medication the she may be able to tolerate better If your daughter can identify what triggers her migraines then she can avoid these and hopefully decrease the frequency of the attacks. Hope this helps