Nicotinamide: with alcohol - skin rashes and itching are possible. When combined with colestyramine, the absorption of nicotinamide, which is part of the combination multivitamins + phospholipids. It is recommended to observe the interval of 4-6 hours between the reception of these drugs.
Pyridoxine: the physiological function of vitamins B1 and B6 is the potentiation of the actions of each other, manifested in a positive effect on the nervous, muscular and cardiovascular systems. With simultaneous use with hormonal contraceptives, an increase in the concentration of pyridoxine in the blood plasma is possible. With simultaneous use, potentiates the action of diuretics.
When combined with levodopa, the effects of levodopa are reduced or completely inhibited. With simultaneous use with isonicotinhydrazide, penicillamine, cycloserine, a decrease in the effectiveness of pyridoxine is possible. With simultaneous use with phenytoin, phenobarbital, the concentrations in the blood plasma of phenytoin and phenobarbital may decrease.
Riboflavin: when used simultaneously with m-holinoblokatorami, absorption and bioavailability of riboflavin increases (due to a decrease in intestinal motility).
With simultaneous use with thyroid hormones, metabolism of riboflavin is accelerated.
With simultaneous use decreases the activity of doxycycline, tetracycline, oxytetracycline, erythromycin and lincomycin.
Riboflavin is not compatible with streptomycin.
With simultaneous use, the side effects of chloramphenicol are reduced and prevented (violation of hemopoiesis, optic neuritis).
With simultaneous application chlorpromazine, amitriptyline due to blockade of flavinokinase, the incorporation of riboflavin into flavinadenine mononucleotide and flavinadenine dinucleotide is disrupted and its excretion in the urine is increased.
Thiamine: ethanol sharply reduces the absorption of thiamine (concentration in the blood can decrease by 30%). Long-term treatment with anticonvulsant drugs can lead to a thiamine deficiency. Thiamine completely disintegrates in solutions containing sulfites. Thiamine is unstable in alkaline and neutral solutions; the appointment with carbonates, citrates, barbiturates, copper preparations is not recommended.
Tocopherol: when used simultaneously with tocopherol, the effects of warfarin and dicumarol may change.
There are reports of a decrease in the effectiveness of simultaneous treatment with iron in children.
With simultaneous application of tocopherol with cyclosporin, the absorption of cyclosporin increases.