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Azithromycin / trovafloxacin Disease Interactions

There are 5 disease interactions with azithromycin / trovafloxacin:

Major

Macrolide Antibiotics (Includes Azithromycin/trovafloxacin) ↔ Qt Prolongation

Severe Potential Hazard, High plausibility

Applies to: Long QT Syndrome, Hypokalemia, Magnesium Imbalance, Arrhythmias

Prolonged cardiac repolarization and QT interval have been reported in patients receiving treatment with macrolides. Providers should weight risks and benefits of using these drugs in patients with known prolongation of the QT interval, history of torsades de pointes, congenital long QT syndrome, bradyarrhythmias, proarrhythmic conditions such as uncorrected hypokalemia or hypomagnesemia, or patients receiving other drugs that prolong the QT interval.

Major

Trovafloxacin (Includes Azithromycin/trovafloxacin) ↔ Liver Disease

Severe Potential Hazard, High plausibility

Applies to: Liver Disease, Biliary Obstruction

Trovafloxacin undergoes metabolism by the liver as well as excretion by the hepatobiliary system. Patients with hepatic impairment or biliary obstruction may be at greater risk for adverse effects from trovafloxacin due to decreased drug clearance. Therapy with trovafloxacin should be administered cautiously in these patients. The manufacturer recommends a dosage reduction in mild to moderate cirrhosis. Periodic assessment of hepatic function is advised, especially during prolonged therapy (>= 21 days), since trovafloxacin can also cause elevations of liver enzymes.

References

  1. Teng R, Harris SC, Nix DE, Schentag JJ, Foulds G, Liston TE "Pharmacokinetics and safety of trovafloxacin (CP-99,219), a new quinolone antibiotic, following administration of single oral dose to healthy male volunteers." J Antimicrob Chemother 36 (1995): 385-94
  2. Dalvie DK, Khosla N, Vincent J "Excretion and metabolism of trovafloxacin in humans." Drug Metab Dispos 25 (1997): 423-7
  3. "Product Information. Trovan (trovafloxacin)." Pfizer US Pharmaceuticals, New York, NY.
View all 6 references
Moderate

Antibiotics (Includes Azithromycin/trovafloxacin) ↔ Colitis

Moderate Potential Hazard, Moderate plausibility

Applies to: Colitis/Enteritis (Noninfectious)

Pseudomembranous colitis has been reported with most antibacterial agents and may range in severity from mild to life-threatening, with an onset of up to two months following cessation of therapy. Antibiotic therapy can alter the normal flora of the colon and permit overgrowth of Clostridium difficile, whose toxin is believed to be a primary cause of antibiotic- associated colitis. The colitis is usually characterized by severe, persistent diarrhea and severe abdominal cramps, and may be associated with the passage of blood and mucus. The most common culprits are clindamycin, lincomycin, the aminopenicillins (amoxicillin, ampicillin), and the cephalosporins. Therapy with broad-spectrum antibiotics and other agents with significant antibacterial activity should be administered cautiously in patients with a history of gastrointestinal diseases, particularly colitis. There is some evidence that pseudomembranous colitis, if it occurs, may run a more severe course in these patients and that it may be associated with flares in their underlying disease activity. The offending antibiotic(s) should be discontinued if significant diarrhea occurs during therapy. Stool cultures for Clostridium difficile and stool assay for C. difficile toxin may be helpful diagnostically. A large bowel endoscopy may be considered to establish a definitive diagnosis in cases of severe diarrhea.

References

  1. Moriarty HJ, Scobie BA "Pseudomembranous colitis in a patient on rifampicin and ethambutol." N Z Med J 04/23/80 (1980): 294-5
  2. Thomas E, Mehta JB "Pseudomembranous colitis due to oxacillin therapy." South Med J 77 (1984): 532-3
  3. Harmon T, Burkhart G, Applebaum H "Perforated pseudomembranous colitis in the breast-fed infant." J Pediatr Surg 27 (1992): 744-6
View all 47 references
Moderate

Azithromycin (Includes Azithromycin/trovafloxacin) ↔ Liver Disease

Moderate Potential Hazard, Moderate plausibility

Applies to: Liver Disease, Biliary Obstruction

Azithromycin is primarily excreted by the hepatobiliary system. Although the drug is generally well-tolerated and associated with few adverse effects, therapy with azithromycin should be administered cautiously in patients with liver and/or biliary disease. Hepatotoxicity (abnormal liver function, hepatitis, cholestatic jaundice, necrosis and hepatic failure) has been reported. Treatment should be discontinued immediately if signs and symptoms of hepatitis occur. Azithromycin is contraindicated in patients with a history of cholestatic jaundice or hepatic dysfunction associated with the prior use of azithromycin.

References

  1. "Product Information. Azithromycin Product Information (azithromycin)." Pfizer US Pharmaceuticals, New York, NY.
  2. Chave J, Munafo A, Chatton JY, Dayer P, Glauser MP, Biollaz J "Once-a-week azithromycin in AIDS patients: tolerability, kinetics, and effects on zidovudine disposition." Antimicrob Agents Chemother 36 (1992): 1013-18
  3. Zuckerman JM, Kaye KM "The newer macrolides: azithromycin and clarithromycin." Infect Dis Clin North Am 9 (1995): 731-45
View all 4 references
Moderate

Macrolide Antibiotics (Includes Azithromycin/trovafloxacin) ↔ Myasthenia Gravis

Moderate Potential Hazard, Moderate plausibility

Applies to: Myasthenia Gravis

The use of macrolide antibiotics has been reported to exacerbate symptoms of myasthenia gravis and trigger new onset of symptoms of myasthenic syndrome. Limited data suggest presynaptic suppression of acetylcholine release. Therapy with these agents should be administered cautiously in patients with a history of myasthenia gravis.

References

  1. May EF, Calvert PC "Aggravation of myasthenia gravis by erythromycin." Ann Neurol 28 (1990): 577-9
  2. "Product Information. Ery-tab (erythromycin)." Abbott Pharmaceutical, Abbott Park, IL.

azithromycin / trovafloxacin drug Interactions

There are 696 drug interactions with azithromycin / trovafloxacin

azithromycin / trovafloxacin alcohol/food Interactions

There are 2 alcohol/food interactions with azithromycin / trovafloxacin

Drug Interaction Classification

The classifications below are a general guideline only. It is difficult to determine the relevance of a particular drug interaction to any individual given the large number of variables.

Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.

Do not stop taking any medications without consulting your healthcare provider.

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