Vitamin B Complex Oral is a complex of 8 types of vitamin B. They include Vitamin B1, B2, B3, B5, B6, B7, B9 and B12. Together they carry out various metabolic processes in body which are essential for physical and mental health. Vitamin B Complex Oral is an over-the-counter and prescription dietary supplement used for the treatment and management of migraine, canker sores, skin wounds, Pre-Menstrual Syndrome (PMS) and depression and anxiety. The side effects of Vitamin B Complex Oral include - High blood sugar - Low blood pressure - Rashes - Headache - Fatigue - Vomiting - Compromised liver functioning Vitamin B Complex Oral interacts with the following drugs. - Drugs for blood pressure e.g. Diuretics, Beta blockers, ACE inhibitors - Anti-Seizure drugs e.g. Clobazam, Diazepam - Drugs for Tuberculosis e.g. Isoniazid, Rifampin - Anti-cancer drugs e.g. Vincristine, Methotrexate - Antibiotics e.g. Amoxicillin, Ciprofloxacin