Ascorbic acid increases the absorption of drugs of the penicillin group, iron, the concentration in the blood of benzylpenicillin and tetracyclines; in a dose of 1 g / day increases the bioavailability of ethinyl estradiol (including those included in oral contraceptives). Reduces the effectiveness of heparin and non-direct anticoagulants. Acetylsalicylic acid, oral contraceptives, fresh juices and alkaline drink reduce absorption and absorption.
With simultaneous use with acetylsalicylic acid increases excretion of ascorbic acid with urine and reduction of excretion of acetylsalicylic acid.
Acetylsalicylic acid reduces the absorption of ascorbic acid by about 30%.
Increases the risk of developing crystalluria in the treatment of salicylates and sulfonamides short-acting, slows the excretion of the kidneys, increases the excretion of drugs that have an alkaline reaction (including alkaloids), reduces the concentration of oral contraceptives in the blood.
Increases the total clearance of ethanol, which in turn reduces the concentration of ascorbic acid in the body.
The drugs of quinoline series, calcium chloride, salicylates, glucocorticosteroids with long-term use deplete the stores of ascorbic acid.
With simultaneous use reduces the chronotropic effect of isoprenaline.
With prolonged use in high doses, it can disrupt the interaction of disulfiram-ethanol.
In high doses increases the excretion of mexiletine by the kidneys. Barbiturates and primidon increase the excretion of ascorbic acid in the urine. Reduces the therapeutic effect of antipsychotic drugs (neuroleptics) - derivatives of phenothiazine,tubular reabsorption of amphetamine and tricyclic antidepressants.