Taking valproic acid with other medicines and herbal supplements

There are some medicines that may affect how valproic acid works. Valproic acid can also affect the way other medicines work.

Tell your doctor if you're taking:

• any other medicines for epilepsy such as carbamazepine
• medicines for preventing blood clots such as warfarin
• aspirin
• cimetidine, a medicine for stomach ulcers
• medicines to treat HIV and AIDS such as ritonavir
• antibiotics such as erythromycin
• medicines for depression or other mental health problems, such as venlafaxine, quetiapine or diazepam
• cholesterol-lowering medicines such as cholestyramine
• medicines to prevent malaria such as mefloquine or chloroquine