Paracetamol
Paracetamol, when taken for a long time, enhances the effect of indirect anticoagulants (warfarin and other coumarins). which increases the risk of bleeding. Episodic intake of a single dose of the drug has no significant effect on the effect of indirect anticoagulants.
Inductors of isoenzymes of microsomal oxidation in the liver (barbiturates, diphenin, carbamazepine, rifamnicin, zidovudine, fenitoia, ethanol, flumecinol, phenylbutazone and tricyclic antidepressants) increase the risk of hepatotoxic effects during overdoses and simultaneous administration with paracetamol. Inhibitors of microsomal oxidation (cimetidine) reduce the risk of hepatotoxic effects of paracetamol.
Paracetamol decreases the effectiveness of diuretic drugs.
Metoclopramide and domperidone increase, and colestramine reduces the rate of absorption of paracetamol.
Paracetamol increases the effects of MAO inhibitors. sedatives, ethanol. Diflunisal increases the plasma concentration of paracetamol by 50%, increasing the risk of hepatotoxicity.
Paracetamol reduces the effectiveness of uricosuric (sulfinpyrazone, etc.) drugs.
Phenylephrine
Phenylephrine when taken with MAO inhibitors can lead to increased blood pressure.
Phenylephrine reduces the effectiveness of beta-blockers and antihypertensive drugs, increases the risk of developing hypertension and cardiovascular disorders.
Simultaneous use of phenylephrine with sympathomimetic amines can increase the risk of side effects from the cardiovascular system. Tricyclic antidepressants enhance the sympathomimetic effect of phenylephrine, may increase the risk of developing side effects of the cardiovascular system.
The simultaneous use of halothane with phenylephrine increases the risk of ventricular arrhythmia.
Phenylephrine reduces the hypotensive effect of guanethidine, nitrates, methyldopa. Guanethidine increases the alpha-adrenostimulating activity of phenylephrine.
With the simultaneous use of phenylephrine with antidepressants, antiparkinsonian, antipsychotic drugs (phenothiazine derivatives), urinary retention, dry mouth, constipation is possible.
The combined use of phenylephrine with glucocorticosteroids increases the risk of developing glaucoma.
The combined use of phenylephrine with digoxin or other cardiac glycosides increases the risk of cardiac rhythm and myocardial infarction.
Ascorbic acid Ascorbic acid increases the concentration in the blood of benzylpenicillin and tetracyclines.
Ascorbic acid improves absorption in the intestine of iron preparations (converts trivalent iron into bivalent); can increase the excretion of iron with simultaneous application with deferoxamine.
Ascorbic acid reduces the effectiveness of heparin and indirect anticoagulants. ASA, oral contraceptives, fresh juices and alkaline drink reduce the absorption and absorption of ascorbic acid.
With simultaneous application with ASA, urinary excretion of ascorbic acid increases and the excretion of ASA decreases. ASA reduces the absorption of ascorbic acid by about 30%.
Ascorbic acid increases the risk of developing crystalluria in the treatment of short-acting salicylates and sulfonamides, slows the excretion of acids by the kidneys, increases the excretion of drugs that have an alkaline reaction (including alkaloids), and decreases the concentration of oral contraceptives in the blood.
Ascorbic acid increases the overall clearance of ethanol, which in turn reduces the concentration of ascorbic acid in the body.
Tetracycline, as well as barbiturates (primidon) increase the excretion of ascorbic acid with urine.
Ascorbic acid reduces the therapeutic effect of antipsychotic drugs (neuroleptics) - derivatives of fepotiazine, tubular reabsorption of amphetamine and tricyclic antidepressants.
Simultaneous use with ethanol promotes the development of acute pancreatitis. Myelotoxic drugs increase the manifestation of hematotoxicity of the drug.