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Clarithromycin (Clarithromycin) - Summary



Clarithromycin is a semi-synthetic macrolide antibiotic.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of clarithromycin tablet and other antibacterial drugs, clarithromycin tablet should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

Clarithromycin tablet is indicated for the treatment of mild to moderate infections caused by susceptible strains of the designated microorganisms in the conditions as listed below:

Adults (Clarithromycin Tablet)

Pharyngitis/Tonsillitis due to Streptococcus pyogenes (The usual drug of choice in the treatment and prevention of streptococcal infections and the prophylaxis of rheumatic fever is penicillin administered by either the intramuscular or the oral route. Clarithromycin is generally effective in the eradication of S. pyogenes from the nasopharynx; however, data establishing the efficacy of clarithromycin in the subsequent prevention of rheumatic fever are not available at present.)

Acute maxillary sinusitis due to Haemophilus influenzae, Moraxella catarrhalis, or Streptococcus pneumoniae.

Acute bacterial exacerbation of chronic bronchitis due to Haemophilus influenzae, Haemophilus parainfluenzae, Moraxella catarrhalis, or Streptococcus pneumoniae.

Community-Acquired Pneumonia due to Haemophilus influenzae, Mycoplasma pneumoniae, Streptococcus pneumoniae, or Chlamydia pneumoniae (TWAR).

Uncomplicated skin and skin structure infections due to Staphylococcus aureus, or Streptococcus pyogenes (Abscesses usually require surgical drainage).

Disseminated mycobacterial infections due to Mycobacterium avium, or Mycobacterium intracellulare

Clarithromycin tablet in combination with amoxicillin and PREVACID (lansoprazole) or PRILOSEC (omeprazole) Delayed-Release Capsules, as triple therapy, are indicated for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or five-year history of duodenal ulcer) to eradicate H. pylori.    

Clarithromycin tablet in combination with PRILOSEC (omeprazole) capsules or TRITEC (ranitidine bismuth citrate) tablets are also indicated for the treatment of patients with an active duodenal ulcer associated with H. pylori infection. However, regimens which contain clarithromycin as the single antimicrobial agent are more likely to be associated with the development of clarithromycin resistance among patients who fail therapy. Clarithromycin-containing regimens should not be used in patients with known or suspected clarithromycin resistant isolates because the efficacy of treatment is reduced in this setting.

In patients who fail therapy, susceptibility testing should be done if possible. If resistance to clarithromycin is demonstrated, a non-clarithromycin-containing therapy is recommended. (For information on development of resistance see Microbiology section.) The eradication of H. pylori has been demonstrated to reduce the risk of duodenal ulcer recurrence.

Children (Clarithromycin Tablet)

Pharyngitis/Tonsillitis due to Streptococcus pyogenes.

Community-Acquired Pneumonia due to Mycoplasma pneumoniae, Streptococcus pneumoniae, or Chlamydia pneumoniae (TWAR).

Acute maxillary sinusitis due to Haemophilus influenzae, Moraxella catarrhalis, or Streptococcus pneumoniae

Acute otitis media due to Haemophilus influenzae, Moraxella catarrhalis, or Streptococcus pneumoniae

NOTE: For information on otitis media, see CLINICAL STUDIES: Otitis Media.

Uncomplicated skin and skin structure infections due to Staphylococcus aureus, or Streptococcus pyogenes (Abscesses usually require surgical drainage.)

Disseminated mycobacterial infections due to Mycobacterium avium, or Mycobacterium intracellulare

Clarithromycin tablet is indicated for the prevention of disseminated Mycobacterium avium complex (MAC) disease in patients with advanced HIV infection.

See all Clarithromycin indications & dosage >>


Published Studies Related to Clarithromycin

Expression comparison of azithromycin and clarithromycin in triple-therapy regimens for eradication of Helicobacter pylori in hemodialysis patients. [2014]
To compare a triple-therapy regimen based on change of antibiotic (azithromycin and clarithromycin) for the eradication of Helicobacter pylori in hemodialysis (HD) patients, we studied in a prospective, randomized, double-blinded clinical trial 39 patients who had dyspepsia and showed two positive results from the diagnostic tests of H...

Evaluation of subgingivally delivered 0.5% clarithromycin as an adjunct to nonsurgical mechanotherapy in the management of chronic periodontitis: a short-term double blinded randomized control trial. [2014]
periodontitis subjects... CONCLUSION: Adjunctive use of 0.5% CLM as a controlled drug delivery system

Cethromycin versus clarithromycin for community-acquired pneumonia: comparative efficacy and safety outcomes from two double-blinded, randomized, parallel-group, multicenter, multinational noninferiority studies. [2012]
Community-acquired pneumonia (CAP) continues to be a major health challenge in the United States and globally. Factors such as overprescribing of antibiotics and noncompliance with dosing regimens have added to the growing antibacterial resistance problem...

Clarithromycin therapy for patients with cystic fibrosis: a randomized controlled trial. [2012]
The clinically significant actions of oral azithromycin in modifying progressive cystic fibrosis (CF) lung disease have been well documented. In vitro and clinical data suggests that clarithromycin has immunomodulatory properties similar to other 14-member macrolides, however two previously reported short term, open label trials of clairthromycin in small numbers of patients with CF failed to show significant benefits in modifying lung function or inflammation...

Clarithromycin, as an adjunct to non surgical periodontal therapy for chronic periodontitis: a double blinded, placebo controlled, randomized clinical trial. [2011.10]
OBJECTIVE: Along with conventional non-surgical periodontal therapy (NSPT) systemic antimicrobials may provide more effective treatment for chronic periodontitis by targeting tissue-invasive bacteria. The aim of this randomized, placebo-controlled, double-masked clinical trial was to evaluate the adjunctive effects of oral clarithromycin (CLM) to non-surgical periodontal therapy for chronic periodontitis... CONCLUSIONS: The utilisation of CLM in combination with SRP improves the efficacy of NSPT in reducing PD, improving CAL and in lessening microbial loads. Hence, CLM may be beneficial in the non-surgical treatment regimen of chronic periodontitis. Copyright (c) 2011 Elsevier Ltd. All rights reserved.

more studies >>

Clinical Trials Related to Clarithromycin

Drug-Drug Interaction Study Between CJ-12420 and Clarithromycin in Healthy Male Subjects [Active, not recruiting]

Clarithromycin as Immunomodulator for the Management of Sepsis [Completed]
The herein protocol is based on the results of one former clinical trial conducted by our study group showing the considerable efficacy of intravenously administered clarithromycin as an adjuvant to antimicrobial chemotherapy for patients with sepsis, septic shock and respiratory failure in the field of ventilator-associated pneumonia. The proposed clinical trial is based on the need to generalize the application of intravenous clarithromycin in the total of admitted septic patients irrespective of the underlying cause of sepsis.

Effects of Clopidogrel and Clarithromycin on the Oral Disposition of Sibutramine in Healthy Subjects [Completed]

Clarithromycin for the Treatment of Hypersomnia [Completed]
The term 'hypersomnia' describes a group of symptoms that includes severe daytime sleepiness and sleeping long periods of time (more than 10 hours per night). Sometimes, hypersomnia is caused by a problem with the quality of sleep occurring at night, for instance when nighttime sleep is disrupted by frequent breathing pauses. In other cases, however, hypersomnia occurs even when nighttime sleep is of good quality. These cases of hypersomnia are presumed to be a symptom of brain dysfunction, and so are referred to as hypersomnias of central (i. e., brain) origin. The causes of most of these central hypersomnias are not known. However, our group has recently identified a problem with the major brain chemical responsible for sedation, known as GABA. In a subset of our hypersomnia patients, there is a naturally-occurring substance that causes the GABA receptor to be hyperactive. In essence, it is as though these patients are chronically medicated with Valium (or Xanax or alcohol, all substances that act through the GABA system), even though they do not take these medications. Current treatment of central hypersomnias is limited. For the fraction of cases with narcolepsy, there are FDA-approved, available treatments. However, for the remainder of patients, there are no treatments approved by the FDA. They are usually treated with medications approved for narcolepsy, but sleep experts agree that these medications are often not effective for this group of patients. Based on our understanding of the GABA abnormality in these patients, we evaluated whether clarithromycin (an antibiotic approved by the FDA for the treatment of infections) would reverse the GABA abnormality. In a test tube model of this disease, clarithromycin does in fact return the function of the GABA system to normal. The investigators have treated a few patients with clarithromycin and most have felt that their hypersomnia symptoms improved with this treatment. To determine whether clarithromycin is truly beneficial for central hypersomnia, this study will compare clarithromycin to an inactive pill (the placebo). All subjects will receive both clarithromycin and the placebo at different times, and their reaction times and symptoms will be compared on these two treatments to determine if one is superior. If this study shows that clarithromycin is more effective than placebo in the treatment of hypersomnia, it will identify a potential new therapy for this difficult-to-treat disorder.

Drug Interaction Study Between Linezolid and Clarithromycin in Tuberculosis Patients [Completed]
Future patients might benefit from a combination of linezolid (LIN) and clarithromycin (CLA) in the treatment of Multidrug-resistant and Extensively Drug-resistant Tuberculosis (MDR/XDR-TB) due to possible synergistic activity as shown in in vitro experiments in different Mycobacteria strains. The investigators observed increased LIN serum levels in three cases after combining LIN and CLA of which the investigators described one in a case report (Bolhuis et al). The investigators suggest to conduct a prospective pharmacokinetic study in MDR- and XDR-TB patients to quantify the above described interaction between LIN and CLA.

more trials >>

Reports of Suspected Clarithromycin Side Effects

Drug Interaction (138)Dyspnoea (78)Renal Failure Acute (71)Vomiting (62)Pyrexia (61)Oedema Peripheral (61)Erythema (60)Diarrhoea (55)Nausea (52)Pruritus (51)more >>


Based on a total of 5 ratings/reviews, Clarithromycin has an overall score of 7. The effectiveness score is 8.40 and the side effect score is 6.40. The scores are on ten point scale: 10 - best, 1 - worst. Below are selected reviews: the highest, the median and the lowest rated.

Clarithromycin review by 42 year old female patient

Overall rating:  
Effectiveness:   Highly Effective
Side effects:   No Side Effects
Treatment Info
Condition / reason:   lower respiratory tract infection
Dosage & duration:   500 mg taken once daily for the period of 5 days
Other conditions:   coughing
Other drugs taken:   none
Reported Results
Benefits:   It clears the infection in the sinus and lower respiratory tract. I was coughing badly due to irritation from mucus formed by post nasal drip down the throat. The phlegm was yellow in colour.
Side effects:   I have not experienced any side effects like bloating, nausea or anything like that.
Comments:   Dosage 500 mg once daily for 5 days on full stomach.


Clarithromycin review by 21 year old female patient

Overall rating:  
Effectiveness:   Considerably Effective
Side effects:   Severe Side Effects
Treatment Info
Condition / reason:   Sinusitis
Dosage & duration:   500mg taken every 12 hours for the period of 7 days
Other conditions:   IBS
Other drugs taken:   Birth control, Mebeverine
Reported Results
Benefits:   Started to work within 12 hours, much less pus and blood from nostrils. Pressure in face reduced with in 36 hours.
Side effects:   Severe nausea, bitter taste in mouth within an hour of first dose. IBS flare up within a few hours of taking the dose, abdominal pain and achy joints and neck.
Comments:   Sinusitis diagnosed after 1 week of pressure headache and pussy nosebleeds. 1000mg per day for 7 days prescribed. Aggrivated IBS and caused severe nausea and bitterness in the mouth that disturbed sleep pattern. Also feeling of anxiety noted.


Clarithromycin review by 15 year old female patient

Overall rating:  
Effectiveness:   Marginally Effective
Side effects:   Severe Side Effects
Treatment Info
Condition / reason:   Strep Throat
Dosage & duration:   500mg taken once per day for the period of once
Other conditions:   none
Other drugs taken:   none
Reported Results
Benefits:   Immediately took the pain from the Strep away.
Side effects:   Terrible taste in mouth, 4 and a half hours of constant dry-heaving, painful and sudden headaches, body aches.
Comments:   The side effects were so terrible, never felt so badly in my entire life. WOuldnt recommend for anyone unless they have a strong stomach

See all Clarithromycin reviews / ratings >>

Page last updated: 2015-08-10

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