Acetylsalicylic acid
Combination with methotrexate in a dose 15 mg per week is contraindicated.
Combinations of drugs that are used with caution:
Methotrexate in a dose of less than 15 mg / week: With simultaneous use of drugs, the hematological toxicity of methotrexate is increased because NSAIDs generally decrease the renal clearance of methotrexate, and salicylates in particular are displacing it from the bond with plasma proteins.
Anticoagulants (coumarin, heparin): with simultaneous admission, ASA and indirect anticoagulants increases the risk of bleeding due to the suppression of platelet function, damage to the mucous membrane of the stomach and duodenum and the displacement of oral anticoagulants from their association with plasma proteins.
Other NSAIDs with salicylates in a high dose (at a dose of 3 g / day or more): with the simultaneous use of drugs due to the effect of synergism increases the risk of ulceration of the mucosa shell of the gastrointestinal tract and bleeding.
Uricosuric preparations (probenecid, sulfinpyrazone): the therapeutic effect of uricosuric drugs is reduced due to competitive tubular elimination of uric acid.
Digoxin: with the simultaneous use of drugs increases the concentration of digoxin in the plasma by reducing its excretion.
Antidiabetic drugs (insulin.sulfonylurea): intensified hypoglycemic effect due to the fact that ASA in high dose has hypoglycemic properties and displaces sulfonylurea from the connection with plasma proteins.
Thrombolytics / antiplatelet drugs of other classes (ticlopidine): increased risk of bleeding.
Diuretics in combination with ASA in a dose of 3 g / day or more: the glomerular filtration decreases, due to a decrease in the synthesis of prostaglandins in the kidneys.
Systemic glucocorticosteroids (GCS) excluding hydrocortisone (used to treat Addison's disease): when the simultaneous use of drugs, the concentration of salicylates in the blood decreases, as GCS enhances the elimination of salicylates.
Angiotensin-converting enzyme (ACE) inhibitors: while simultaneous use of ACE inhibitors and ASA at a dose of 3 g / day or more, a decrease in the hypotensive effect ACE inhibitors, due to a decrease in glomerular filtration.
Valproic Acid: ASA disrupts the association of valproic acid with plasma proteins, resulting in increased toxicity.
Alcohol: when combined with ASA, the damaging effect on the mucosagastrointestinal tract and lengthening the time of bleeding.
Phenylephrine
Monoamine oxidase inhibitors (MAO inhibitors) - with the simultaneous use of phenylephrine and MAO inhibitors (antidepressants - tranylcypromine; moclobemide; antiparkinsonian drugs - selegiline) severe side effects are possible in the form of intense headache, increased blood pressure and body temperature.
Beta-blockers - with simultaneous application possible rise blood pressure (arterial hypertension) and pronounced bradycardia.
Sympathomimetics with simultaneous application increases the influence sympathomimetics on the central nervous system and cardiovascular system. Perhaps stimulation, irritability, insomnia.
Inhalation anesthetics - use of phenylephrine before Inhalation anesthesia increases the risk of heart rate abnormalities. It is necessary to stop phenylephrine treatment several days before the planned surgical treatment.
Rawwolfia alkaloids - with simultaneous use, the therapeutic effect of phenylephrine may decrease.
Caffeine- with simultaneous use, the therapeutic and toxic effects of caffeine can be enhanced.
Indomethacin, bromocriptine - In isolated cases with the simultaneous use of phenylephrine with indomethacin or bromocriptine, severe arterial hypertension is possible.
Selective serotonin reuptake inhibitors - with simultaneous use with antidepressants of this group (fluvoxamine, paroxetine, sertraline) can be strengthened as the sensitivity of the body to sympathomimetics, and the risk of developing a serotonergic effect increases.
Hypotensive drugs from the sympatholytic group: such as reserpine. guanethidine - Phenylephrine reduces the hypotensive effect of these drugs.
Chlorphenamine
Alcohol, hypnotics, tranquilizers, antipsychotic drugs (antipsychotics); analgesics of neutral action- chlorphenamine can enhance, the inhibitory effect of these drugs on the central nervous system
Anticholinergic drugs (atropine, antispasmodics, tricyclic antidepressants, MAO inhibitors, antiparkinsonian drugs) - Chlorphenamine enhances the anticholinergic effect of these drugs.