Azithromycin

Voriconazole 400 mg twice a day for 7 days (maintenance dose) 300 mg once a day for 7 days Healthy male subjects (12) ↑ AUC by 331%, ↑ C max by 195% ↑ AUC by ~100%, ↑ C max by ~100% g CONTRAINDICATED ANTI-PCP (Pneumocystis carinii pneumonia) Dapsone 50 mg once a day 300 mg once a day HIV infected patients (16) ND ↓ AUC by 27 -40% Sulfamethoxazole-Trimethoprim 800/160 mg 300 mg once a day HIV infected patients (12) ↓ AUC by 15-20% ANTI-MAC (Mycobacterium avium intracellulare complex) Azithromycin 500 mg once a day for 1 day, then 250 mg once a day for 9 days 300 mg once a day Healthy subjects (6) Clarithromycin 500 mg twice a day 300 mg once a day HIV infected patients (12) ↑ AUC by 75% ↓ AUC by 50% Monitor for rifabutin associated adverse events.

Macrolide products have been observed to cause acute ergot toxicity characterized by severe peripheral vasospasm and dysesthesia. Careful monitoring advised.

Macrolide products have been observed to cause acute ergot toxicity characterized by severe peripheral vasospasm and dysesthesia. Careful monitoring advised.

Potential to increase pravastatin sodium exposures and increase the risk of myopathy and rhabdomyolysis.

7 DRUG INTERACTIONS Nelfinavir: Close monitoring for known adverse reactions of azithromycin, such as liver enzyme abnormalities and hearing impairment, is warranted. ( 7.1 ) Warfarin: Use with azithromycin may increase coagulation times; monitor prothrombin time. ( 7.2 ) 7.1 Nelfinavir Co-administration of nelfinavir at steady-state with a single oral dose of azithromycin resulted in increased azithromycin serum concentrations.

7 DRUG INTERACTIONS Nelfinavir: Close monitoring for known adverse reactions of azithromycin, such as liver enzyme abnormalities and hearing impairment, is warranted. ( 7.1 ) Warfarin: Use with azithromycin may increase coagulation times; monitor prothrombin time. ( 7.2 ) 7.1 Nelfinavir Co-administration of nelfinavir at steady-state with a single oral dose of azithromycin resulted in increased azithromycin serum concentrations.

Drug interactions have been observed with other macrolide products. Careful monitoring of patients is advised until further data are developed.

Increases cyclosporine concentrations via CYP3A4 inhibition. Dosage adjustment essential.

Co-administration resulted in increased plasma concentrations of desloratadine and 3-hydroxydesloratadine, but no clinically relevant changes in safety profile.

Increases digoxin concentrations; magnitude unclear. Requires monitoring and dose adjustment.

Macrolide products including azithromycin may increase hexobarbital concentrations. Careful monitoring is advised.

Co-administration increases azithromycin serum concentrations. Close monitoring for adverse reactions including liver enzyme abnormalities and hearing impairment is warranted.

Drug interactions have been observed with other macrolide products. Careful monitoring of patients is advised until further data are developed.

QT interval prolonging drug. Coadministration with VANFLYTA may further increase incidence of QT prolongation. More frequent ECG monitoring recommended.

Macrolide products including azithromycin may increase terfenadine concentrations. Careful monitoring is advised.

Concomitant administration may potentiate effects of oral anticoagulants. Prothrombin times should be carefully monitored.

Azithromycin had a modest effect on atorvastatin pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on carbamazepine pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on cetirizine pharmacokinetics. No dosage adjustment recommended.

No clinically significant interaction found.

Co-administration results in increased plasma concentrations of desloratadine but no clinically relevant changes in safety profile.

Azithromycin had a modest effect on didanosine pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on efavirenz pharmacokinetics; efavirenz had modest effect on azithromycin. No dosage adjustment recommended.

No significant pharmacokinetic interaction between fluconazole and azithromycin observed in a three-way crossover study.

Azithromycin had a modest effect on indinavir pharmacokinetics. No dosage adjustment recommended.

Pharmacokinetic interaction study with racemic cetirizine showed no interaction with azithromycin.

Azithromycin had a modest effect on midazolam pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on sildenafil pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on trimethoprim/sulfamethoxazole pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on theophylline pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on triazolam pharmacokinetics. No dosage adjustment recommended.

Azithromycin had a modest effect on zidovudine pharmacokinetics. No dosage adjustment recommended.

albuterol, systemic and inhaled amoxicillin ampicillin, with or without sulbactam atenolol azithromycin caffeine, dietary ingestion cefaclor co-trimoxazole (trimethoprim and sulfamethoxazole) diltiazem dirithromycin enflurane famotidine felodipine finasteride hydrocortisone isoflurane isoniazid isradipine influenza vaccine ketoconazole lomefloxacin mebendazole medroxyprogesterone methylprednisolone metronidazole metoprolol nadolol nifedipine nizatidine norfloxacin ofloxacin omeprazole prednisone, prednisolone ranitidine rifabutin roxithromycin sorbitol (purgative doses do not inhibit theophylline absorption) sucralfate terbutaline, systemic terfenadine tetracycline tocainide The Effect of Other Drugs on Theophylline Serum Concentration Measurements: Most serum theophylline assays in clinical use are immunoassays which are specific for theophylline.

Amiodarone can inhibit the metabolism of macrolide/ketolide antibiotics (except for azithromycin) and systemic azole antifungal drugs.

7.4 Drugs with No Observed or Predicted Interactions with the Components of EVOTAZ Based on known metabolic profiles, clinically significant drug interactions are not expected between EVOTAZ and acetaminophen, atenolol, dapsone, fluconazole, trimethoprim/sulfamethoxazole, or azithromycin [see Clinical Pharmacology (12.3; Table 7) ].

Antimycobacterials: Rifampin a Rifapentine ↓Cabotegravir ↓Rilpivirine Antimycobacterial: Rifabutin a ↓Cabotegravir ↔Rifabutin ↓Rilpivirine Glucocorticoid (systemic): Dexamethasone (more than a single-dose treatment) ↓Rilpivirine Herbal product: St John’s wort ( Hypericum perforatum ) ↓Rilpivirine Macrolide or ketolide antibiotics: Azithromycin Clarithromycin Erythromycin ↔Cabotegravir ↑Rilpivirine Macrolides are expected to increase concentrations of rilpivirine and are associated with a risk of Torsade de Pointes [see Warnings and Precautions ( 5.5 )] . Where possible, consider alternatives, such as azithromycin, which increases rilpivirine concentrations less than other macrolides.

Macrolide or ketolide antibiotics: Clarithromycin Erythromycin Telithromycin ↔Dolutegravir ↑Rilpivirine Where possible, consider alternatives, such as azithromycin.

7.6 Drugs without Clinically Significant Interactions No dosage adjustment is recommended when efavirenz, lamivudine and tenofovir disoproxil fumarate is administered with the following: aluminum/magnesium hydroxide antacids, azithromycin, cetirizine, famotidine, fluconazole, and lorazepam.

Macrolide or Ketolide Antibiotics: clarithromycin erythromycin telithromycin ↑ RPV ↔ clarithromycin ↔ erythromycin ↔ telithromycin Where possible, alternatives such as azithromycin should be considered.

Macrolide or Ketolide Antibiotics: clarithromycin erythromycin telithromycin ↑­ RPV ↔ clarithromycin ↔ erythromycin ↔ telithromycin Where possible, alternatives such as azithromycin should be considered.

Macrolide or Ketolide Antibiotics: clarithromycin erythromycin telithromycin ↑ RPV ↔ clarithromycin ↔ erythromycin ↔ telithromycin Where possible, alternatives such as azithromycin should be considered.

Alternatives to clarithromycin, such as azithromycin, should be considered for the treatment of MAC. Alternatives to clarithromycin, such as azithromycin, should be considered for the treatment of MAC.

Based on known metabolic profiles, clinically significant drug interactions are not expected between lopinavir and ritonavir and dapsone, trimethoprim/sulfamethoxazole, azithromycin, erythromycin, or fluconazole.

Consider an alternative to these antibiotics, such as ciprofloxacin, azithromycin, and levofloxacin. 7.15 Concomitant Drugs That Do Not Need Dosage Adjustment No dosage adjustment of ORKAMBI or concomitant drug is recommended when ORKAMBI is given with the following: azithromycin, aztreonam, budesonide, ceftazidime, cetirizine, ciprofloxacin, colistimethate, colistin, dornase alfa, fluticasone, ipratropium, levofloxacin, pancreatin, pancrelipase, salbutamol, salmeterol, sulfamethoxazole, trimethoprim, tiotropium, and tobramycin.

MACROLIDE ANTIBIOTIC Azithromycin ↑ azithromycin Dose adjustment of azithromycin is not recommended, but close monitoring for known side effects such as liver enzyme abnormalities and hearing impairment is warranted.

Alternatives to clarithromycin, such as azithromycin, should be considered.

CYP3A Inhibitors CYP3A inhibitors such as ketoconazole, fluconazole, itraconazole, clarithromycin, erythromycin (Azithromycin, although structurally related to the class of macrolide antibiotic is void of clinically relevant CYP3A4 inhibition), grapefruit, nefazodone, fluoxetine, saquinavir, indinavir, nelfinavir, and ritonavir may result in increased exposure to nifedipine when co-administered.

Macrolide or ketolide antibiotics: azithromycin clarithromycin erythromycin ↑ rilpivirine ↔ azithromycin ↔ clarithromycin ↔ erythromycin Macrolides are expected to increase concentrations of rilpivirine and are associated with a risk of Torsade de Pointes [Warnings and Precautions (5.4) ] . Where possible, consider alternatives, such as azithromycin, which increases rilpivirine concentrations less than other macrolides Narcotic Analgesics: methadone * ↓ R(-) methadone ↓ S(+) methadone No dose adjustments are required when initiating coadministration of methadone with rilpivirine tablets.

Macrolide or ketolide antibiotics: azithromycin clarithromycin erythromycin ↑ rilpivirine ↔ azithromycin ↔ clarithromycin ↔ erythromycin Macrolides are expected to increase concentrations of rilpivirine and are associated with a risk of Torsade de Pointes [Warnings and Precautions (5.4)]. Where possible, consider alternatives, such as azithromycin, which increases rilpivirine concentrations less than other macrolides.

When used in therapeutic doses, azithromycin had a modest effect on the pharmacokinetics of atorvastatin, carbamazepine, cetirizine, didanosine, efavirenz, fluconazole, indinavir, midazolam, rifabutin, sildenafil, theophylline (intravenous and oral), triazolam, trimethoprim/sulfamethoxazole or zidovudine.

albuterol, systemic and inhaled mebendazole amoxicillin medroxyprogesterone ampicillin, with or without sulbactam methylprednisolone atenolol metronidazole azithromycin metoprolol caffeine, dietary ingestion nadolol cefaclor nifedipine co-trimoxazole (trimethoprim and sulfamethoxazole) nizatidine diltiazem norfloxacin dirithromycin ofloxacin enflurane omeprazole famotidine prednisone, prednisolone felodipine ranitidine finasteride rifabutin hydrocortisone roxithromycin isoflurane Sorbitol (purgative doses do not inhibit theophylline absorption) isoniazid sucralfate isradipine terbutaline, systemic influenza vaccine terfenadine ketoconazole tetracycline lomefloxacin tocainide