Which vitamin deficiency is most commonly seen in a pregnant mother who is on phenytoin therapy for epilepsy:

Hypotension and arrythmias occur only on iv injection. Vitamin deficiencies associated with phenytoin: — Folic acid (most common) – Vitamin D – Vitamin K These vitamin deficiencies occur in all patients an phenytoin therapy and have nothing do with pregnancy. Hence all patients on phenytoin are advised to take folic acid supplementation.