Acetylsalicylic acid increases the toxicity of methotrexate, reducing its renal clearance,valproic acid; enhances the effects of non-steroidal anti-inflammatory drugs, narcotic analgesics, oral hypoglycemic drugs, heparin, indirect anticoagulants, thrombolytic and antiaggregants, sulfonamides (including co-trimoxazole), T3 (triiodothyronine); reduces the effect of uricosuric medicines (benzbromarone, sulfinpyrazone), antihypertensive drugs, diuretics (spironolactone, furosemide).
Glucocorticosteroid agents, ethanol and ethanol-containing drugs increase the damaging effect on the mucous membrane of the gastrointestinal tract, increase the risk of developing gastrointestinal bleeding.
Increases the concentration of digoxin, barbiturates, lithium salts in plasma.
Antacids containing magnesium ions and / or aluminum ions slow down and worsen the absorption of acetylsalicylic acid.
Myelotoxic drugs increase the manifestation of hematotoxicity of acetylsalicylic acid.
Paracetamol reduces the effectiveness of uricosuric medicines.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 liver enzymes (phenytoin, barbiturates, rifampicin, phenylbutazone, tricyclic antidepressants), ethanol and hepatotoxic drugs increase the production of hydroxylated active metabolites, which makes it possible to develop severe intoxication even with a slight overdose.
Long-term use of barbiturates reduces the effectiveness of paracetamol. Simultaneous reception of paracetamol and ethanol increases the risk of hepatotoxic effects.
Inhibitors of microsomal oxidation (including cimetidine) reduce the risk hepatotoxic action.
Prolonged sharing of paracetamol and other non-steroidal anti-inflammatory drugs increases the risk of developing "analgesic" nephropathy 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.
Myelotoxic drugs increase the manifestation of hematotoxicity of the drug.
Under the influence of paracetamol, the half-life (T 1/2) of chloramphenicol increases fivefold. At repeated reception paracetamol can enhance the effect of anticoagulants (coumarin derivatives).
Caffeine is an adenosine antagonist (large doses of adenosine may be required).
With the joint use of caffeine and barbiturates, primidone, anticonvulsant drugs (hydantoin derivatives, especially phenytoin) it is possible to increase metabolism and increase caffeine clearance; cimetidine, oral contraceptive drugs, disulfiram, ciprofloxacin, norfloxacin - a decrease in the metabolism of caffeine in the liver (slowing its elimination and increasing blood concentrations).
Mexiletine - reduces caffeine withdrawal to 50%; nicotine - Increases the speed of caffeine removal.
Inhibitors of monoamine oxidase, furazolidone, procarbazine and selegiline - large doses of caffeine can cause the development of dangerous cardiac arrhythmias or severeincreasing blood pressure.
Caffeine reduces the absorption of calcium in the gastrointestinal tract.
Reduces the effect of narcotic and hypnotic drugs.
Increases the excretion of lithium drugs with urine.
Accelerates absorption and enhances the action of cardiac glycosides, increases their toxicity. Joint use of caffeine with beta-blockers can lead to mutual suppression of therapeutic effects; with adrenergic bronchodilator drugs - to additional stimulation of the central nervous system.