Reduces the effectiveness of uricosuric drugs. The concomitant use of paracetamol in high doses increases the effect of anticoagulant drugs (a decrease in the synthesis of procoagulant factors in the liver). Inductors of microsomal oxidation in the liver (phenytoin, ethanol, barbiturates, rifampicin, phenylbutazone, tricyclic antidepressants), ethanol and hepatotoxic drugs increase the production of hydroxylated active metabolites, which allows the possibility of severe intoxication even with a slight overdose.
Long-term use of barbiturates reduces the effectiveness of paracetamol.
Ethanol promotes the development of acute pancreatitis.
Inhibitors of microsomal oxidation (incl. cimetidine) reduce the risk of hepatotoxic effects.
Long-term combined use of paracetamol and non-steroidal anti-inflammatory drugs increases the risk of developed analgesic neuropathy and renal papillary necrosis, the onset of the terminal stage of renal failure.
Simultaneous long-term administration of paracetamol in high doses and salicylates increases the risk of developing kidney or bladder cancer. Diflunisal increases the plasma concentration of paracetamol by 50% - the risk of developing hepatotoxicity. Reduces the effectiveness of uricosuric medicines.
With a decrease in the rate of gastric emptying (propanthelin), the action of the drug slows down, with acceleration (metoclopramide) starts to act faster.
Increases the toxicity of chloramphenicol.
Vitamin C increases the absorption of penicillin, iron, reduces the effect of heparin and indirect anticoagulants, increases the risk of crystalluria in the treatment of salicylates.Absorption of vitamin C decreases with simultaneous use with oral contraceptives.
Vitamin C slows the excretion of kidney acids, reduces the reabsorption of drugs that have an alkaline reaction (including alkaloids).
Vitamin C in combination with deferoxamine increases the toxic effect of iron on tissues (especially on the heart, causing the development of heart failure), administration of drugs containing ascorbic acid is carried out after determining the concentration of deferoxamine and determining the excretion of iron, no earlier than 1 to 2 hours after infusion of deferoxamine .