Ascorbic acid
- increases the concentration in the blood of benzylpenicillin and tetracyclines;
- improves absorption in the intestine of iron preparations (converts trivalent iron into bivalent); can increase excretion of iron with simultaneous application with deferoxamine;
- increases the risk of developing crystalluria in the treatment of salicylates and sulfonamides short-acting, slows the excretion of acid by the kidneys, increases the excretion of drugs that have an alkaline reaction (incl.alkaloids), reduces the concentration of oral contraceptives in the blood.
- increases the total clearance of ethanol;
- with simultaneous use reduces the chronotropic effect of isoprenaline.
Can both increase and decrease the effect of anticoagulant drugs. Reduces the therapeutic effect of antipsychotics (neuroleptics) - phenothiazine derivatives, tubular reabsorption of amphetamine and tricyclic antidepressants.
Simultaneous reception of barbiturates increases the excretion of ascorbic acid in the urine.
Chlorphenamine maleate
Chlorphenamine maleate enhances the effect of hypnotic drugs.
Antidepressants, antiparkinsonian agents, antipsychotics (phenothiazine derivatives) - increase the risk of side effects (urinary retention, dry mouth, constipation).
Glucocorticosteroids - increase the risk of developing glaucoma.
Ethanol enhances the sedative effect of chlorphenamine maleate.
Paracetamol
In the interaction of paracetamol and inducers of microsomal oxidation in the liver (phenytoin, ethanol, barbiturates, rifampicin, phenylbutazone, tricyclic antidepressants) increases production of hydroxylated active metabolites, which allows the development of severe intoxication with small overdoses.
Against the background of paracetamol ethanol promotes the development of acute pancreatitis.
Inhibitors of microsomal oxidation (incl. cimetidine) reduce the risk of hepatotoxic effects.
Simultaneous reception of diflunisal and paracetamol increases the concentration in the blood plasma of the latter by 50%, increasing hepatotoxicity. Simultaneous reception of barbiturates reduces the effectiveness of paracetamol.
Paracetamol reduces the effectiveness of uricosuric drugs.