DK 4000 Vitamin D3 + Vitamin K2 Fosphenytoin Sodium
ModerateVitamin D3 (cholecalciferol) in the Vitamin D3 + Vitamin K2 medicine is known to interact with fosphenytoin. The leaflet doesn't say what the interaction does, only that the two affect each other when taken together.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.