Viva-D Injection Alfacalcidol Phenobarbital
ModeratePhenobarbital can raise how much vitamin D your body needs, so if you take it with alfacalcidol, you may need more of the vitamin.
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.