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Preclar (Biaxin)

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Preclar is used to treat bacterial infections in many different parts of the body. It is also used in combination with other medicines to treat duodenal ulcers caused by H. pylori. This medicine is also used to prevent and treat Mycobacterium avium complex (MAC) infection.

Other names for this medication:
Abbotic, Aeroxina, Biaxin, Biclar, Clacee, Clarimax, Claripen, Clariwin, Clarix, Clonocid, Fromilid, Kalixocin, Karin, Klabax, Klabion, Klarithran, Klerimed, Kofron, Krobicin, Lekoklar, Macladin, Macrobid, Macrol, Moxifloxacin, Synclar, Veclam, Zeclar

Similar Products:
Cipro, Zitromax, Erythromycin, Azithromycin, Roxithromycin, Erythrocin, Zmax, Zithromax, Ery-Tab, Dificid, Erythrocin Stearate Filmtab, Eryc, EryPed, Erythrocin Lactobionate, Ilosone, PCE Dispertab


Also known as:  Biaxin.


Preclar (generic name: clarithromycin; brand names include: Maclar / Klaricid / Klacid / Clarimac / Claribid) is used to treat many different types of bacterial infections affecting the skin and respiratory system, including: Strep throat, Pneumonia, Sinusitis (inflamed sinuses), Tonsillitis (inflamed tonsils), Acute middle ear infections, Acute flare-ups of chronic bronchitis.

It also is used to treat and prevent disseminated Mycobacterium avium complex (MAC) infection [a type of lung infection that often affects people with human immunodeficiency virus (HIV)]. It is used in combination with other medications to eliminate H. pylori, a bacteria that causes ulcers.

It also is used sometimes to treat other types of infections including Lyme disease (an infection that may develop after a person is bitten by a tick), crypotosporidiosis (an infection that causes diarrhea), cat scratch disease (an infection that may develop after a person is bitten or scratched by a cat), Legionnaires' disease (a type of lung infection), and pertussis (whooping cough; a serious infection that can cause severe coughing). It is also sometimes used to prevent heart infection in patients having dental or other procedures.

This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.

Preclar works by stopping the growth of or killing sensitive bacteria by interfering with their protein synthesis.


Preclar Filmtab and Preclar Granules may be given with or without food.

Preclar XL Filmtab should be taken with food. Swallow Preclar XL Filmtab whole; do not chew, break or crush Preclar XL Filmtab.

Triple therapy: Preclar Filmtab/lansoprazole/amoxicillin. The recommended adult dosage is 500 mg Preclar Filmtab, 30 mg lansoprazole, and 1 gram amoxicillin, all given every 12 hours for 10 or 14 days.

Triple therapy: Preclar Filmtab/omeprazole/amoxicillin. The recommended adult dosage is 500 mg Preclar Filmtab, 20 mg omeprazole, and 1 gram amoxicillin; all given every 12 hours for 10 days. In patients with an ulcer present at the time of initiation of therapy, an additional 18 days of omeprazole 20 mg once daily is recommended for ulcer healing and symptom relief.

Dual therapy: Preclar Filmtab/omeprazole. The recommended adult dosage is 500 mg Preclar Filmtab given every 8 hours and 40 mg omeprazole given once every morning for 14 days. An additional 14 days of omeprazole 20 mg once daily is recommended for ulcer healing and symptom relief.


Overdose symptoms may include severe stomach pain, nausea, vomiting, or diarrhea.


Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F) away from moisture and heat. Keep container tightly closed. Protect from light. Throw away any unused medicine after the expiration date. Keep out of the reach of children.

Side effects

The most common side effects associated with Preclar are:

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Side effect occurrence does not only depend on medication you are taking, but also on your overall health and other factors.


Discontinue immediately if hepatitis or severe hypersensitivity reactions occurs. Severe renal impairment. Proarrhythmic conditions (eg, hypokalemia, hypomagnesemia, bradycardia); avoid. Myasthenia gravis. History of porphyria; avoid concomitant ranitidine bismuth citrate. Elderly. Pregnancy (Cat.C): usually not recommended. Nursing mothers.

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A total of 332 patients with H. pylori infection were randomly assigned to receive either 7-day PPI triple therapy, 10-day sequential therapy or 15-day sequential therapy. Eradication rate, drug compliance, and adverse events were compared among the three regimens.

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These findings have indicated that eradication of H. pylori infection may decrease the risk of atherosclerosis and cardiovascular events.

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Mycobacterium terrae is ubiquitous in our environment. M terrae infections most commonly involve tendon sheaths, bones, bursae, and joints. We report a case of infectious arthritis of the knee caused by M terrae in a 21-year-old man who had non-specific chronic synovitis. No organism was seen on microscopy or isolated from cultures until months later. Initially the M terrae culture was considered a contaminant and specific anti-mycobacterial treatment was not advised. The patient was commenced on suppressive therapy for persistent effusion and discomfort. Eventually, the M terrae infection was confirmed and he was commenced on clarithromycin, ciprofloxacin, and ethambutol. The triple antibiotic regimen was continued for 2 years. The knee improved but never completely settled. The patient chose to cease all antibiotic medication. The knee remained swollen and irritable, with little chance of eradicating the organism.

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The results from the 3 pharmacokinetic studies reviewed demonstrate the bioequivalence of the ER and IR formulations and support the use of this clarithromycin ER formulation in a once-daily dosing regimen in phase III clinical trials. The ER tablet should be taken with food to maximize bioavailability. The results of 2 phase III comparative clinical efficacy and safety trials of clarithromycin ER tablets versus IR tablets in AMS and AECB confirm the good tolerability of the ER formulation.

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A 60-year-old woman was referred to the hospital with an infectious keratitis of the left eye of 3 months duration, unresponsive to empirical therapy with ofloxacin and tobramycin drops. Her medical history included a longstanding rheumatoid arthritis and a secondary ocular surface syndrome. Upon arrival the left eye showed diffuse corneal edema and centrally several large infiltrates with fluffy edges, surrounded by several smaller satellite infiltrates. The cornea was scraped for culture and grew M chelonae and sensitivity testing showed sensitivity to ciprofloxacin, clofazimine, and clarithromycin. Systemically, ciprofloxacin 750 mg and clarithromycin 500 mg twice daily were prescribed orally. Topical therapy consisted of topical erythromycin 10 mg/mL and ofloxacin 3 mg/mL every 2 hours. Treatment was continued for a total of 10 months during which the infiltrates cleared completely, but the central cornea remained scarred.

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The primary efficacy variable was the percentage of patients who had a 20% improvement according to American College of Rheumatology (ACR) criteria (an ACR 20 response) at 6-months. Secondary outcome measures were 50% improvement and 70% improvement according to ACR criteria (an ACR 50 response and an ACR 70 response, respectively).

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The incidence of adverse drug reactions was 2.21% and the H. pylori eradication rate was 92.8%. Subgroup analyses performed to investigate the patient background factors affecting safety and efficacy revealed no factors that significantly affected the incidence of adverse drug reactions or the H. pylori eradication rate.

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Several antiarrhythmic and non-cardiovascular drug therapies including antimicrobial agents have been implicated as the causes for QT interval prolongation, torsades de pointes (TdP) ventricular tachycardia and sudden cardiac death. Most of the drugs that have been associated with the lengthening of the QT interval or development of TdP can also block the rapidly activating component of the delayed rectifier potassium current (IKr) in the ventricular cardiomyocytes. This article presents a review of the current literature on the QT interval prolonging effect of antimicrobials based on the results of the in vitro, in vivo studies and case reports. Our observations were derived from currently available Medline database. As we found, the most frequently QT interval prolonging antimicrobials are erythromycin, clarithromycin, fluoroquinolones, halofantrine, and pentamidine. Almost every antimicrobial-associated QT interval prolongation occurs in patients with multiple risk factors of the following: drug interactions, female gender, advanced age, structural heart disease, genetic predisposition, and electrolyte abnormalities. In conclusion, physicians should avoid prescribing antimicrobials having QT prolonging potential for patients with multiple risk factors. Recognition and appropriate treatment of TdP are also indispensable.

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preclar 500 mg 2016-08-16

Among the 60 patients, no significant difference was found between the two groups at 2 weeks after presentation (p = 0.598). In the placebo group, complete response was seen in 20 (66.7%), partial response in 3 (10.0%) while no response was seen in 7 (23.3%). In clarithromycin group, there was complete response in 23 (76.7%), partial response in 3 (10. Keflex Generic Name 0%) and no response in 4 (13.3%) patients.

preclar jarabe 250 mg 2017-06-18

The parent strain had no ribosomal alteration, but both high-level resistant and hypersusceptible strains had R88P mutations in ribosomal protein L22. Radioactive macrolide accumulation studies pointed to the presence of macrolide efflux in the high-level resistant and parent strains, but not in the hypersusceptible Metrocream Generic Price derivative. Transformation of hypersusceptible strains using total DNA from the parent strain restored the macrolide efflux system in the hypersusceptible strain, which was confirmed by MIC levels and radioactive erythromycin accumulation similar to that of the mutant resistant strain. Analysis of sequence and transcription of acrAB gene clusters showed no significant differences between resistant and hypersusceptible derivatives.

preclar claritromicina 500 mg 2015-08-26

The success of Helicobacter pylori eradication regimens depends on gastric pH, inflammation, and mucus thickness. Our aim was to investigate the effects of acid secretion, inflammation, and mucolysis on Amoxicilina Dimopen Suspension Oral gastric antibiotic transfer.

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We found high rates of resistance, especially to clarithromycin, and especially in patients who had received previous eradication therapy. Empirical Purbac Tablet treatments should use effective antimicrobials and avoid regimens based on a single antibiotic. Culture of gastric biopsy samples provides information on the resistance to antimicrobials in a given setting, and this information can be used to develop the most rational treatment for the infection.

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20 consecutively patients hospitalized in the Internal Medicine ward were studied during 18 months with isolation of multiresistant A. baumanni in respiratory tract specimens with Supreme New York Online Store or without clinical signs of infection.

preclar 500 mg contraindicaciones 2015-10-28

The importance of macrolide-resistant (MR) Mycoplasma pneumoniae has become much more apparent in the past decade. We investigated differences in the therapeutic efficacies of macrolides, minocycline, and tosufloxacin against MR M. pneumoniae. A total of 188 children with M. pneumoniae pneumonia confirmed by culture and PCR were analyzed. Of these, 150 patients had a strain with an MR gene and 134 had one with an A-to-G mutation at position 2063 of M. pneumoniae 23S rRNA domain V. Azithromycin (n = 27), clarithromycin (n = 23), tosufloxacin (n = 62), or minocycline (n = 38) was used for definitive treatment of patients with MR M. pneumoniae. Defervescence within 48 h after the initiation of antibiotic therapy was observed in 41% of the patients in the azithromycin group, 48% of those in the clarithromycin group, 69% of those in the tosufloxacin group, and 87% of those in the minocycline group. The average number of days of fever after the administration of antibiotic treatment was lower in the minocycline and tosufloxacin groups than in the macrolide groups. The decrease in the M. pneumoniae burden, as estimated by the number of DNA copies, after 48 to 96 h of treatment was more rapid in patients receiving minocycline (P = 0.016) than Amixen Clavulanico Suspension in those receiving tosufloxacin (P = 0.049), azithromycin (P = 0.273), or clarithromycin (P = 0.107). We found that the clinical and bacteriological efficacies of macrolides against MR M. pneumoniae pneumonia was low. Our results indicated that minocycline rather than tosufloxacin can be considered the first-choice drug for the treatment of M. pneumoniae pneumonia in children aged ≥ 8 years.

preclar 250 mg 2017-04-01

To evaluate the role of sequential therapy and Lactobacillus reuteri (L. reuteri) Enhancin Antibiotic And Alcohol supplementation, in the eradication treatment of Helicobacter pylori (H. pylori).

preclar 125 mg 5 ml 2016-10-14

A total of 5746 patients [2333 males (58.8%), 1636 females (41.2%); mean age of males vs females 51.31 ± 13.1 years vs 52 Flagystatin Mercury Drug .76 ± 13.6 years, P < 0.05, total mean age 51.9 ± 13.3 years (mean ± SD)] were investigated. Among these patients, 1674 patients were excluded: 35 patients refused treatment; 18 patients ceased H. pylori eradication due to side effects; 1211 patients had inappropriate indications for H. pylori eradication, having undergone stomach cancer operation or chemotherapy; and 410 patients did not undergo the follow-up. We also excluded 103 patients who wanted to stop eradication treatment after only 1 wk due to poor compliance or the side effects mentioned above. Finally, we evaluated the annual eradication success rates in a total of 3969 patients who received 2 wk first-line PAC therapy. The endoscopic and clinical findings in patients who received the 2 wk PAC were as follows: gastric ulcer in 855 (21.5%); duodenal ulcer in 878 (22.1%); gastric and duodenal ulcer in 124 (3.1%), erosive, atrophic gastritis and functional dyspepsia in 2055 (51.8%); and other findings (e.g., MALToma, patients who wanted to receive the therapy even though they had no abnormal endoscopic finding) in 57 (0.5%). The overall eradication rate of the 2 wk standard first-line triple regimen was 86.5%. The annual eradication rates from 2000 to 2010 were 86.7%, 85.4%, 86.5%, 83.3%, 89.9%, 90.5%, 88.4%, 84.5%, 89.1%, 85.8%, and 88.3%, sequentially (P = 0.06). No definite evidence of a significant change in the eradication rate was seen during the past eleven years. The eradication rates of second-line therapy were 88.9%, 82.4%, 85%, 83.9%, 77.3%, 85.7%, 84.4%, 87.3%, 83.3%, 88.9%, and 84% (P = 0.77). The overall eradication rate of 1 wk quadruple second-line therapy was 84.7%. There was no significant difference in the eradication rate according to the H. pylori associated diseases.

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137 patients were included (62 women, 75 males, average age 46.9 +/- 13) diagnosed with peptic ulcer and infection by Helicobacter pylori. None had received treatment previously. 67 patients were treated with RBC 400 mg bd and clarithromycin 500 mg bd for 14 days, and 70 patients with RBC 400 mg bd, clarithromycin 500 mg bd and amoxycillin 1 g bd for 7 days. The infection eradication was proven eight weeks after treatment end. The efficacy of treatment was evaluated using the intention-to-treat method. The Chisquare test (chi 2) was used for the statistical analysis of data.