Doxacil 100 Doxycycline Phenytoin Sodium
ModeratePhenytoin can make your body break down doxycycline faster, so doxycycline may not stay in your blood long enough to work as well. Several other medicines are affected in the same way.
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.
What to do: Ask your doctor or pharmacist before taking these together. They may check you or change your plan.