Pharmacodynamic interaction
Not recommended combinations
Drugs that extend the QT interval
- drugs that extend the QT interval (for example, quinidine, disopyramide, bepridil, sotalol, ibutilide, amiodarone)
- drugs that extend the QT interval, not related to cardiovascular agents (eg, pimazide, ziprasidone, sertindole, mefloquine, halofantrine, pentamidine, cisapride, erythromycin in / in).
Co-administration with QT-prolonging drugs may increase heart rate reduction, so careful cardioversion should be performed if necessary for co-administration.
Pharmacokinetic interaction
Cytochrome P 450 ZA4 (CYP3A4)
Iwabradine is metabolized in the liver by the enzymes of the cytochrome P450 system (CYP3A4) and is a very weak inhibitor of this cytochrome. Iwabradine does not have a significant effect on the metabolism and concentration in the blood plasma of other substrates of cytochrome CYP3A4. At the same time, inhibitors and inducers of CYP3A4 interact with ivabradine and affect its metabolism and pharmacokinetic properties. It was found that inhibitors of cytochrome CYP3A4 increase, and cytochrome CYP3A4 inducers reduce plasma concentrations of ivabradine.Increased concentration of ivabradine in blood plasma increases the risk of developing severe bradycardia.
Contraindicated combinations
Simultaneous application with strong inhibitors of cytochrome P 450, such as antifungal agents of the azole group (ketoconazole, intraconazole), antibiotics from the macrolide group (clarithromycin, erythromycin oral, josamycin, telithromycin), HIV protease inhibitors (nelfinavir, ritonavir) and nefazodone, ketoconazole (200 mg once a day) or josamycin (1 g 2 times a day) increase the average concentration of ivabradine in blood plasma by 7-8 times.
Not recommended combinations
CYP3A4 inhibitors of moderate action. The combined use of ivabradine and augmenting heart rate, diltiazem or verapamil was well tolerated by patients and was accompanied by an increase in the concentration of ivabradine 2-3 times, with an additional decrease in heart rate of about 5 bpm. This combination is not recommended.
Combinations that require caution when applying
CYP3A4 inhibitors of moderate action: simultaneous application of ivabradine with other inhibitors of CYP3A4 (for example, fluconazole) should begin with an initial dose of 2.5 mg 2 times a day. At a heart rate less often 60 bpm. careful control of heart rate is necessary.
Grapefruit juice. Against the background of taking grapefruit juice there was an increase in the concentration of ivabradine in the blood 2 times. During the treatment with ivabradine, the intake of grapefruit juice and St. John's wort is to be minimized. Inductors CYP3 A4, such as rifampicin, barbiturates, phenytoin and herbal preparations containing Hypericum perforatum (Hypericum perforatum), when combined, can lead to a decrease in blood concentrations and activity of ivabradine and require the selection of a higher dose of ivabradine. During the treatment with ivabradine, the use of drugs and products containing St. John's Wort is to be minimized. Combined use with other drugs The absence of a clinically pronounced effect on the pharmacodynamics and pharmacokinetics of ivabradine following drugs has been demonstrated: proton pump inhibitors (omeprazole, lansoprazole ), inhibitors of phosphodiesterase-5 (sildenafil), inhibitors of HMG-CoA reductase (simvastatin), blockers of "slow" calcium channels derivatives of dihydropyridine series (amlodipine, lacidipine), digoxin and warfavin. Shown, that ivabradine has no clinically significant effect on the pharmacokinetics of simvastatin, amlodipine, lacidipine, pharmacokinetics and pharmacokinetic dynamics of digoxin, warfavin, and the pharmacodynamics of acetylsalicylic acid.
In a pilot Phase III trial, the use of the following drugs has been specifically restricted, and therefore they can be administered in combination with ivabradine without special precautions: angiotensin converting enzyme (ACE) inhibitors, AT II receptor antagonists, diuretics, nitrates of short and prolonged actions, inhibitors of HMG-CoA reductase, fibrates, proton pump inhibitors, oral hypoglycemic agents, acetylsalicylic acid and other antithrombotic agents.