7 DRUG INTERACTIONS
7.1 Effect of M.V.I. Adult on Other Drugs
Phenytoin: Folic acid may increase phenytoin metabolism and lower the serum concentration of phenytoin resulting in increased seizure activity.
Methotrexate: Folic acid may decrease a patient's response to methotrexate therapy.
Levodopa: Pyridoxine may increase the metabolism of levodopa (decrease blood level of levodopa) and decrease its efficacy.
Antibiotics: Thiamine, riboflavin, pyridoxine, niacinamide, and ascorbic acid decrease antibiotic activities of erythromycin, kanamycin, streptomycin, doxycycline, and lincomycin.
Bleomycin: Ascorbic acid and riboflavin inactivate bleomycin in vitro, thus the activity of bleomycin may be reduced.