Folic acid
Reduces the effect of phenytoin (requires an increase in its dose).
Analgesics (long-term therapy), anticonvulsant drugs (incl. phenytoin and carbamazepine), estrogens, oral contraceptives increase the need for folic acid.
Antacids (including preparations of aluminum and magnesium), colestramine, sulfonamines (incl. sulfasalazine) reduce the absorption of folic acid.
Methotrexate, pyrimethamine, triamterene, trimethoprim inhibit dihydrofolate reductase and reduce the effect of folic acid.
Pyridoxine hydrochloride
Strengthens the action of diuretics; weakens the activity of levodopa.
Isonicotin hydrazide, penicillamine, cycloserine and estrogen-containing oral contraceptives weaken the effect of pyridoxine.
It is well combined with cardiac glycosides (pyridoxine promotes an increase in the synthesis of contractile proteins in the myocardium), with glutamic acid and asparcam (increases resistance to hypoxia).
Cyanocobalamin
Aminoglycosides, salicylates, antiepileptic drugs, colchicine, potassium preparations reduce the absorption of cyanocobalamin.
Increases the risk of allergic reactions against thiamine.
You can not combine with drugs that increase blood coagulability.