Dynabac Side Effects

Generic Name: dirithromycin

Note: This document contains side effect information about dirithromycin. Some of the dosage forms listed on this page may not apply to the brand name Dynabac.

Some side effects of Dynabac may not be reported. Always consult your doctor or healthcare specialist for medical advice. You may also report side effects to the FDA.

For the Consumer

Applies to dirithromycin: oral tablet enteric coated

Along with its needed effects, dirithromycin (the active ingredient contained in Dynabac) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur while taking dirithromycin:

Rare
  • Abdominal tenderness
  • fever
  • severe abdominal or stomach cramps and pain
  • watery and severe diarrhea, which may also be bloody

Some side effects of dirithromycin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common
  • Diarrhea
  • dizziness
  • headache
  • nausea
  • vomiting
  • weakness

For Healthcare Professionals

Applies to dirithromycin: oral delayed release tablet

Gastrointestinal

Although not observed among patients taking dirithromycin (the active ingredient contained in Dynabac) rare cases of cholestatic hepatitis have been associated with the use of macrolide antibiotics in general.

Gastrointestinal side effects are common. In clinical trials consisting of more than 3000 patients treated with daily doses of 500 mg for approximately 7 to 14 days, 2.6% discontinued therapy because of adverse reactions, of which 40% were due to nausea or abdominal pain. Overall, abdominal pain has been reported in 10%, nausea or diarrhea in 8%, vomiting or dyspepsia in 3%, and flatulence in approximately 2% of patients. Anorexia, constipation, dry mouth, epistaxis, gastritis, gastroenteritis, and mouth ulceration have been reported in less than 1% of patients.

Pseudomembranous colitis has been reported with nearly all antibacterial agents, including dirithromycin, and may range in severity from mild to life-threatening.

Nervous system

Nervous system side effects have included headache (9%), dizziness/vertigo (2%), asthenia (2%), nonspecific pain (2%), and insomnia (1%). Amblyopia, anxiety, depression, malaise, paresthesias, somnolence, taste alterations, tinnitus, and tremors have been reported in less than 1% of patients. Although not observed among patients taking dirithromycin (the active ingredient contained in Dynabac) a few cases of transient deafness have been associated with the use of high doses of a related macrolide, erythromycin.

Hypersensitivity

Hypersensitivity reactions are rare. Rash and pruritus/urticaria have been reported in 1.4% and 1.2% of patients, respectively. Although not observed among patients taking dirithromycin (the active ingredient contained in Dynabac) bullous fixed eruptions and serious allergic reactions including anaphylaxis have been rarely associated with the use of macrolide antibiotics.

Cardiovascular

QT prolongation associated with the use of some macrolide antibiotics has been reported both in otherwise healthy patients and in patients with a history of heart disease or who were on other potentially arrhythmogenic drugs. Most affected patients were receiving erythromycin intravenously.

Cardiovascular side effects have not been observed among patients taking dirithromycin. Other macrolide antibiotics including azithromycin, clarithromycin and erythromycin, have rarely been associated with QT segment prolongation. Ventricular arrhythmias such as torsade de pointes have been reported with these agents.

Respiratory

Respiratory system side effects have rarely included dyspnea and/or cough.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.

Watch this video series to learn about managing severe allergies (anaphylaxis).

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