Clarithromycin
With the joint administration of clarithromycin and drugs, primarily metabolized by isoenzymes CYP3A, there may be a mutual increase in their concentrations, which may enhance or prolong both the therapeutic and side effects.
Contraindicated joint administration with astemizole, cisapride, pimozide, terfenadine, ergotamine and other ergot alkaloids, alprazolam, midazolam, triazolam.
Carefully prescribe with carbamazepine, cilostazol, cyclosporine, disopyramide, lovastatin, methylprednisolone, omeprazole, indirect anticoagulants (including warfarin), quinidine, rifabutin, sildenafil, simvastatin, tacrolimus, vinblastine, phenytoin, theophylline and valproic acid (metabolized through other cytochrome P450 isoenzymes ). It is necessary to adjust the dose of drugs and control the concentration in the blood plasma.
When combined with cisapride, pimozide, terfenadine and astemizole, it is possible to increase the concentration of the latter in the blood plasma, lengthening the interval QT and the development of cardiac arrhythmias, including ventricular paroxysmal tachycardia, fibrillation,flutter or fibrillation of the ventricles, polymorphic ventricular tachycardia of the type "pirouette" (see section "Contraindications"). A similar mechanism of interaction is noted when using drugs metabolized by another isoenzyme of the cytochrome P450 system - phenytoin, theophylline and valproic acid. With the simultaneous administration of the above drugs, monitoring of their concentration in the blood plasma and ECG is required.
Clarithromycin can reduce the clearance of triazolam and, thus, increase its pharmacological effects with the development of drowsiness and confusion.
For benzodiazepines, the excretion of which does not depend on isoenzymes CYP3A4 (temazepam, nitrazepam, lorazepam), clinically significant interaction with clarithromycin is unlikely.
There are reports of an increase in the concentration of digoxin in the blood plasma of patients receiving concomitantly digoxin and clarithromycin. It is necessary to constantly monitor the digoxin content in the blood plasma in order to avoid digitalis intoxication and the development of potentially lethal arrhythmias.
Joint application with ergotamine and dihydroergotamine (ergot derivatives) maylead to acute ergotamine intoxication, manifested by severe peripheral vasospasm, ischemia of limbs and other tissues, including the central nervous system, and perverted sensitivity.
With the simultaneous administration of clarithromycin with HMG-CoA reductase inhibitors-lovastatin and simvastatin-rare cases of rhabdomyolysis have been described.
Efavirenz, nevirapine, rifampicin, rifabutin and rifapentin (inducers of cytochrome P450) reduce the concentration of clarithromycin in the blood plasma and weaken its therapeutic effect, and at the same time increase the concentration of 14 (R) -hydroxyclamirithromycin.
With the simultaneous administration of fluconazole at a dose of 200 mg and clarithromycin at a dose of 1 g / day, an increase in the equilibrium concentration and AUC clarithromycin by 33% and 18%, respectively. Correction of the dose of clarithromycin is not required.
It is necessary to pay attention to the possibility of cross-resistance between clarithromycin and other antibiotics from the macrolide group, as well as lincomycin and clindamycin.
Simultaneous reception of clarithromycin and zidovudine in adult HIV-infected patients may lead to a decrease in the equilibrium level of zidovudine concentration. It is necessary to select doses of clarithromycin and zidovudine.
With the simultaneous administration of clarithromycin and ritonavir, atazanavir, or other protease inhibitors, plasma concentrations like clarithromycin increase, which in this case should not be administered at a dose greater than 1 g / day, or a protease inhibitor.
With the joint administration of clarithromycin and itraconazole, a mutual increase in the concentration of drugs in the blood plasma is possible. For patients who simultaneously take itraconazole and clarithromycin, careful monitoring is necessary because of the possible enhancement or extension of the pharmacological effects of these drugs.
With concurrent administration of clarithromycin (1 g / day) and saquinavir (in soft gelatin capsules, 1200 mg 3 times a day), an increase AUC and the equilibrium concentration of saquinavir by 177% and 187%, respectively, and clarithromycin by 40%. When co-prescribing these two medicines for a limited time in the doses / dosage forms indicated above, dose adjustment is not required. Since cochriction, which is a substrate for CYP3A and P-glycoprotein, and clarithromycin, as well as other macrolides - inhibitors CYP3A and P-glycoprotein, inhibition can lead to an increase in the effect of colchicine, patients should be carefully monitored in order to identify symptoms of the toxic effects of colchicine. When using clarithromycin with tolterodine in patients with low isoenzyme activity CYP2D6, a dose reduction of tolterodine in the presence of clarithromycin (an inhibitor of isoenzymes CYP3A).
With the joint administration of clarithromycin with verapamil it is possible to lower blood pressure, bradyarrhythmia and lactic acidosis.
With the use of etravirine, the concentration of clarithromycin decreases, but the concentration of the active metabolite increases 14 (R) -hydroxy-clarithromycin.
With the combined use of clarithromycin and oral hypoglycemic agents and / or insulin, pronounced hypoglycemia can be observed. Against the background of simultaneous reception of clarithromycin and some drugs that reduce the concentration of glucose, such as nateglinide, pioglitazone, repaglinide and rosiglitazone, there may be an inhibition of the isoenzyme CYP3A clarithromycin, which may result in hypoglycemia. Careful monitoring of glucose concentration is recommended.
Amoxicillin
Antacids, glucosamine, laxatives, aminoglycosides, food slow down and reduce the absorption of amoxicillin; ascorbic acid increases absorption.
Probenecid reduces the excretion of amoxicillin by the kidneys and increases the concentration of amoxicillin in bile and blood plasma.
Bactericidal antibiotics (including aminoglycosides, cephalosporins, vancomycin, rifampicin) - a synergistic effect; bacteriostatic drugs (macrolides, chloramfinekol, lincosamides, tetracyclines, sulfonamides) - antagonistic.
When taking amoxicillin in combination with metronidazole, nausea, vomiting, anorexia, diarrhea, constipation, epigastric pain, digestive disorders, in rare cases jaundice, interstitial nephritis, violations of hemopoiesis.
Amoxicillin improves the effectiveness of indirect anticoagulants (suppressing the intestinal microflora, reduces the synthesis of vitamin K and prothrombin index), which leads to an extension of the clotting time. If necessary, adjust the dose of indirect anticoagulants. Simultaneous use of amoxicillin and allopurinol increases the risk of skin rash.
Amoxicillin reduces clearance and increases the toxicity of methotrexate, probably because of competitive inhibition of tubular renal secretion of methotrexate with amoxicillin. Patients receiving concomitantly amoxicillin and methotrexate, the plasma concentrations of the latter should be carefully monitored.
It is possible to increase the absorption time of digoxin against amoxicillin therapy. If necessary, adjust the dose of digoxin.
Diuretics, allopurinol, oxyphenbutazone, phenylbutazone, non-steroidal anti-inflammatory drugs and other drugs that block tubular secretion, increase the concentration of amoxicillin in the blood plasma.
Amoxicillin reduces the concentration of estrogens and progesterones in the blood plasma, which can lead to a loss of contraceptive effect of oral contraceptives. During treatment with amoxicillin, additional nonhormonal methods of contraception should be used.
Lansoprazole
Lansoprazole slows down the elimination of drugs metabolized in the liver by microsomal oxidation (including diazepam, phenytoin, indirect anticoagulants).
Reduces the clearance of theophylline by 10%.
Slows pH-dependent absorption of drugs belonging to weak acid groups, and accelerates the absorption of drugs belonging to the groups of bases.
Prevents the absorption of ketoconazole, itraconazole, ampicillin, iron salts, digoxin.
Lansoprazole slows the absorption of cyanocobalamin.
Compatible with ibuprofen, indomethacin, diazepam, propranolol, warfarin, oral contraceptives, phenytoin, prednisolone. Sucralfate reduces the bioavailability of lansoprazole by 30%, so it is necessary to observe the interval between taking these medicines 30-40 minutes.
Antacids should be prescribed 1 hour before or 1-2 hours after taking lansoprazole, as they slow down and reduce its absorption.
In volunteers who simultaneously received 60 mg of lansoprazole and 400 mg of atazanavir per day, a decrease of 90% AUC and CmOh the latter. Lansoprazole should not be administered simultaneously with atazanavir.
Ritonavir (substrate and inhibitor CYP2C19) can have a variable effect on AUC lansoprazole (increase or decrease). If necessary, concomitant therapy is recommended to control the therapeutic and possible side effects, as well as dose adjustment of lansoprazole.Simultaneous reception of lansoprazole and tacrolimus (substrate isoenzyme CYP3A4 and P-glycoprotein) leads to an increase in the plasma concentration of the latter (up to 81%). The concentration of tacrolimus in the blood plasma should be monitored while concomitant administration with lansoprazole.
Simultaneous administration of fluvoxamine (inhibitor of isoenzyme CYP2C19) and lansoprazole leads to a fourfold increase in the concentration of the latter in blood plasma.
Rifampicin and St. John's Wort (perforated isozymes CYP2C19 and CYP3A4) can significantly reduce plasma concentrations of lansoprazole.