Increase the concentration of carbamazepine in plasma: verapamil, diltiazem, felodipine, dextropropoxyphene, viloxazine, fluoxetine, fluvoxamine, cimetidine, acetazolamide, danazol, desipramine, nicotinamide (in adults, only in high doses); macrolides (erythromycin, josamycin, clarithromycin, troleandomycin); azoles (itraconazole, ketoconazole, fluconazole), terfenadine, loratadine, isoniazid, propoxyphene, grapefruit juice, viral protease inhibitors used in HIV therapy (for example, ritonavir) - correction of the dosing regimen or monitoring of carbamazepine concentration in plasma is required.
Felbamate reduces the concentration of carbamazepine in plasma and increases the concentration of carbamazepine-10,11-epoxide, while a simultaneous decrease in serum felbamate concentration is possible. The concentration of carbamazepine is reduced phenobarbital, phenytoin, primidon, metsuksimide, fensuksimid, theophylline, rifampicin, cisplatin, doxorubicin, perhaps: clonazepam, valpromid, valproic acid, oxcarbazepine and herbal preparations containing St. John's wort perfumed (Hypericum perforatum). There are reports of the possibility of displacing valproic acid and primidone carbamazepine from plasma protein binding and increasing the concentration of pharmacologically active metabolite (carbamazepine-10,11-epoxide). Isotretinoin changes the bioavailability and / or clearance of carbamazepine and carbamazepine-10,11-epoxide (carbamazepine concentration in the plasma is monitored).
Carbamazepine can reduce the concentration in the plasma (reduce or even completely neutralize the effects) and require correction of the doses of the following drugs: clobazam,clonazepam, ethosuximide, primidon, valproic acid, alprazolam, glucocorticosteroids (prednisolone, dexamethasone), cyclosporine, doxycycline, haloperidol, methadone, oral preparations containing estrogens and / or progesterone (the choice of alternative methods of contraception), theophylline, oral anticoagulants (warfarin, fenprocumone, dicumarol), lamotrigine, topiramate, tricyclic antidepressants (imipramine, amitriptyline, nortriptyline, clomipramine), clozapine, felbamate, tiagabine, oxcarbazepine, protease inhibitors HIV infection (indinavir, ritonavir, saquinovir), calcium channel blockers (a group of dihydropyridines, for example, felodipine), itraconazole, levothyroxine, midazolam, olanzapine, praziquantel, risperidone, tramadol, ziprasidone.
It has been reported that in patients receiving carbamazepine phenytoin plasma levels may either rise or fall, and mephenytoin level - increase (in rare cases).
Carbamazepine when combined with paracetamol increases the risk of its toxic effect on the liver and reduces therapeutic effectiveness (acceleration of the metabolism of paracetamol).
The simultaneous appointment of carbamazepine with phenothiazines, pimozide, thioxanthenes, molindone, haloperidol, maprotiline, clozapine and tricyclic antidepressants leads to increased inhibitory action on the central nervous system and weaken the anticonvulsant effect of carbamazepine.
MAO inhibitors increase the risk of developing hyperpyretic crises, hypertensive crises, seizures, fatal outcome (prior to prescribing carbamazepine, MAO inhibitors should be withdrawn at least 2 weeks or, if the clinical situation permits, even for a longer period).
Simultaneous administration with diuretics (hydrochlorothiazide, furosemide) can lead to hyponatremia, accompanied by clinical manifestations.
Weakens the effects of nondepolarizing muscle relaxants (pancuronium). If such a combination is used, it may be necessary to increase the dose of muscle relaxants, and careful monitoring of patients should be carried out, since a faster cessation of their effect is possible.
Reduces the tolerance of ethanol.
Accelerates the metabolism of indirect anticoagulants, hormonal contraceptives, folic acid; prazikvantela, can enhance the elimination of thyroid hormones.
Accelerates the metabolism of agents for general anesthesia (enflurane, halothane, fluorotan) with increasing risk of hepatotoxic effects; enhances the formation of nephrotoxic metabolites of methoxyflurane. Enhances the hepatotoxic effect of isoniazid.