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Metrazol (Flagyl)

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Metrazol eliminates bacteria and other microorganisms that cause infections of the reproductive system, gastrointestinal tract, skin, vagina, and other areas of the body. Antibiotics will not work for colds, flu, or other viral infections. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

Other names for this medication:
Acuzole, Amodis, Amrizole, Anabact, Anazol, Aristogyl, Bemetrazole, Diazole, Dumozol, Elyzol, Entizol, Filmet, Flagenase, Flagyl, Flagystatin, Flazol, Klion, Medazol, Metazol, Metris, Metrocream, Metrogel, Metrogyl, Metrolag, Metrolotion, Metronidazol, Metronidazole, Metronide, Metropast, Metrosa, Metrovax, Metrozine, Negazole, Nidagel, Nidazol, Nidazole, Noritate, Onida, Protogyl, Rhodogil, Riazole, Rodogyl, Rozex, Stomorgyl, Supplin, Trichazole, Trogyl, Vagilen, Vandazole, Vertisal, Zidoval

Similar Products:
Amoxil, Bactrim, Ampicillin, Augmentin, Macrobid, Trimox, Tinidazole, Biaxin, Chloromycetin, Myambutol

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Also known as:  Flagyl.


Metrazol (generic name: Metronidazole) is an antibiotic that belongs to a group of medicines called nitroimidazoles.

Metrazol is used for the treatment of susceptible anaerobic bacterial and protozoal infections in the following conditions: amebiasis, symptomatic and asymptomatic trichomoniasis; skin and skin structure infections; CNS infections; intra-abdominal infections (as part of combination regimen); systemic anaerobic infections; treatment of antibiotic-associated pseudomembranous colitis (AAPC); bacterial vaginosis; as part of a multidrug regimen for H. pylori eradication to reduce the risk of duodenal ulcer recurrence.


In the Female. One-day treatment – two grams of Metrazol, given either as a single dose or in two divided doses of one gram each, given in the same day. Seven-day course of treatment – 250 mg three times daily for seven consecutive days. There is some indication from controlled comparative studies that cure rates as determined by vaginal smears and signs and symptoms, may be higher after a seven-day course of treatment than after a one-day treatment regimen.

The dosage regimen should be individualized. Single-dose treatment can assure compliance, especially if administered under supervision, in those patients who cannot be relied on to continue the seven-day regimen. A seven-day course of treatment may minimize reinfection by protecting the patient long enough for the sexual contacts to obtain appropriate treatment. Further, some patients may tolerate one treatment regimen better than the other.

Pregnant patients should not be treated during the first trimester In pregnant patients for whom alternative treatment has been inadequate, the one-day course of therapy should not be used, as it results in higher serum levels which can reach the fetal circulation.

When repeat courses of the drug are required, it is recommended that an interval of four to six weeks elapse between courses and that the presence of the trichomonad be reconfirmed by appropriate laboratory measures. Total and differential leukocyte counts should be made before and after re-treatment.


Single oral doses of Metrazol, up to 15 g, have been reported in suicide attempts and accidental overdoses. Symptoms reported include nausea, vomiting, and ataxia. Oral Metrazol has been studied as a radiation sensitizer in the treatment of malignant tumors. Neurotoxic effects, including seizures and peripheral neuropathy, have been reported after 5 to 7 days of doses of 6 to 10.4 g every other day.

There is no specific antidote for Metrazol overdose; therefore, management of the patient should consist of symptomatic and supportive therapy.


Store at room temperature below 25 degrees C (77 degrees F) away from moisture, light and heat. Keep container tightly closed. 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 Metrazol 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.


As a rule, the usual duration of therapy with i.v Metronidazole or other imidazole derivatives is usually less than 10 days. This period may only be exceeded in individual cases after a very strict benefit-risk assessment. Only in the rarest possible case should the treatment be repeated. Limiting the duration of treatment is necessary because damage to human germ cells cannot be excluded.

Intensive or prolonged Metronidazole therapy should be conducted only under conditions of close surveillance for clinical and biological effects and under specialist direction. If prolonged therapy is required, the physician should bear in mind the possibility of peripheral neuropathy or leucopenia. Both effects are usually reversible.

In case of prolonged treatment, occurrence of undesirable effects such as paraesthesia, ataxia, dizziness and convulsive crises should be checked. High dose regimes have been associated with transient epileptiform seizures.

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An 88-year-old Japanese woman was referred to our hospital due to a one-month history of face edema, aphagia, shortness of breath, and skin rush over almost her entire skin. She had no abdominal symptoms. Her peripheral blood count showed a white blood cell (WBC) count of 27.1x10(9)/L with 82.1% eosinophils. Serum non-specific Immunoglobulin E was within a normal range. Soluble interleukin-2 receptor was elevated to 4200U/mL. At first, her eosinophil count was so high that we suspected she had an eosinophilic leukemia or hypereosinophilic syndrome. After admission, cysts of Giardia duodenalis (G. duodenalis) were detected in the patient's feces by microscopic analysis, then she was diagnosed with giardiasis, and 750mg per day of metronidazole was administered for seven days. Her WBC count decreased to 6.0x10(9)/L with 10% eosinophils, and her systemic symptoms improved. At that time her serum IL-5 was within a normal range. A few months later, the patient again complained of skin rush, and G. duodenalis was once again found in her feces. Her serum IL-5 was elevated to 751pg/mL. Metronidazole was administered for two weeks, and her eosinophil count decreased. G. duodenalis is a protozoan parasite, and it is one of the most common waterborne transmission gastrointestinal parasites in the world. G. duodenalis rarely causes hypereosinophilia. To our knowledge, this is the first case report of giardiasis with extreme hypereosinophilia and severe systemic symptoms.

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The incidence of Clostridium difficile associated disease (CDAD) was 3.2 cases per 1000 admissions or discharges and 53.8 cases per 100 000 patient days. Most cases occurred in renal and haematology patients. CDAD was more common in patients aged over 50 years and of male gender. The Indian population was under-represented. Fourteen (11.8%) isolates were A(-)B(+). All strains were susceptible to metronidazole but one strain showed intermediate resistance to vancomycin. Only 12.8% of the isolates were susceptible to clindamycin. Thirty-five isolates had PCR ribotype A, of which 29 (83%) had a clindamycin MIC >256 mg/L. Thirty-three had PCR ribotype B, of which only one (3%) had a clindamycin MIC >256 mg/L. The 14 A(-)B(+) strains were all PCR ribotype C, and had a range of MICs for clindamycin from 2 to >256 mg/L.

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Despite the use of two-week, high-dose, quadruple and culture-guided combinations of drugs, a third treatment was frequently unsuccessful. The lowest eradication rate was obtained in patients with H. pylori strains sensitive to all antibiotics; therefore, we believe that other factors could influence eradication rates. New prospective and randomized studies are needed in this subgroup of patients to find effective treatments.

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Immunoglobulin A (IgA) vasculitis, formerly called Henoch-Schönlein purpura, is a leukocytoclastic type of vasculitis affecting small vessels with a deposition of immune IgA complexes, clinically characterized by the classic tetrad of nonthrombocytopenic palpable purpura, arthralgia (or arthritis), and gastrointestinal and renal involvement. Although the cause of the disease remains unknown, immune complexes of IgA and unidentified antigens seem to play a central pathogenic role. The diagnosis is easily established in the presence of purpura, but may be challenging in its absence, especially when colicky abdominal pain precedes the cutaneous lesions. IgA vasculitis is usually a self-limited disease with a benign course and symptomatic treatment is sufficient for most; in severe cases, however, corticosteroids are necessary. We describe the case of a young adult male presenting with severe abdominal pain, vomiting and fever (38.4ºC). Clinical examination, abdominal ultrasound and plain abdominal radiography excluded an acute abdomen. The occurrence of arthralgia involving both knees and erosive duodenitis at endoscopy, 48 hours upon admission, suggested the diagnosis of IgA vasculitis, confirmed on the following day by the presence of typical purpuric rash on the lower extremities. Corticosteroid therapy led to the resolution of all gastrointestinal and joint manifestations as well as to a significant improvement of cutaneous purpura. However, during the 3rd week of corticosteroid treatment, the patient developed watery diarrhea and the clinical suspicion of Clostridium difficile infection (CDI) was confirmed. The treatment with metronidazole led to the resolution of diarrhea.The peculiarity of this case resides in several aspects: the gastrointestinal and joint manifestations preceded purpura, making diagnosis more difficult; CDI is an extremely rare complication of IgA vasculitis, being, in fact, the second case reported in adults in the literature.

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Although the NCCLS has approved the agar dilution method as the test of choice for antimicrobial susceptibility testing of Helicobacter pylori, a critical evaluation of this method in clinical trials to detect antibiotic resistance has not been performed. This study compares the Etest and agar dilution methods for detection of metronidazole and clarithromycin resistance in clinical isolates of H. pylori. MIC data were gathered from US-based clinical trials. The Etest was performed on Mueller-Hinton sheep blood agar plates following incubation for 4 days under 12% CO(2). The agar dilution test was performed according to the recently approved NCCLS methodology using aged sheep blood in a Mueller-Hinton agar base. Metronidazole resistance as determined by Etest was significantly higher than that determined by agar dilution (39%; 690/1768 vs. 25. 1%; 367/1465)(P<0.01). Clarithromycin resistance as determined by Etest was higher than that determined by agar dilution, but was not significantly different (12.5%; 209/1671 vs. 10.6%; 150/1414)(P>0.5). Inter-patient metronidazole resistance showed that the MIC values for identical isolates tested by both methods were equivalent in 58% (109/188). Of the 42% with a >2log(2) difference in MIC values, 17. 6% had a change in susceptibility pattern. For clarithromycin, 71.4% (237/332) of the MIC values for identical isolates tested by both methods had equivalent MIC values. Of the MIC values with a >2log(2) difference in MIC values, only 3% showed a change in susceptibility pattern. Intra-patient variability, i.e. paired isolates from the same patient, was assessed only for metronidazole. Of the 1393 paired isolates tested by Etest, 38.8% were shown to be resistant. Almost 69% of the Etest MIC determinations were deemed equivalent and 16.7% had a change in susceptibility pattern. Of the 639 paired isolates tested by agar dilution, 23.9% were resistant to metronidazole. Almost 72% of the agar dilution MIC values were equivalent and 11.3% of the determinations had a change in susceptibility pattern. Clarithromycin resistance rates are similar, when determined by either test method. The Etest yields a significantly higher prevalence of metronidazole resistance among H. pylori compared with the agar dilution method and both methods yield discordant results, when isolates from different parts of the same stomach are compared. Neither method is reliable in determining metronidazole resistance in H. pylori.

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Adding saccharomyces boulardii to antibiotics in the treatment of acute amebiasis seems to decrease the duration of clinical symptoms and cyst passage.

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Two hundred and seventy-seven adults aged 35-54 years with H. pylori infection in three villages were assigned to two groups: treatment (n=189 in two villages) and placebo (n=88 in one village). Participants received either a 10-day oral quadruple therapy regimen with omeprazole (20 mg, twice daily); tetracycline (750 mg, three times daily); metronidazole (500 mg, three times daily) and bismuth potassium citrate (300 mg, twice daily), or a similar lookalike placebo regimen. The status of H. pylori infection in each trial participant before and after six weeks of treatment was determined by a 13C-urea breath test.

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Although the nimB gene may be implicated in the high-level metronidazole resistance in 2 F. magna strains, the alarmingly high prevalence of the nimB gene in anaerobic Gram-positive cocci cannot be directly associated with resistance and the possibility of a silent nimB gene should be considered.

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The aim of this study was to confirm a presumptive qualification of clinical B. fragilis group strains isolated in Płock as ESBL-positive strains and to determine some properties of these strains. Twenty four clinical strains belonging to the B. fragilis group, isolated first of all from surgical patients, were received for testing. Identification of strains was performed in the automatic ATB Expression system (bioMerieux sa, France) using biochemical API 20 A strips. Strains were tested for the production of catalase (ID Color Catalase test, bioMerieux sa) and beta-lactamase (Cefinase, BBL, Becton Dickinson, USA). Susceptibility of strains to four antimicrobial agents: clindamycin, metronidazole, amoxicillin/clavulanic acid and imipenem was determined by Etest (AB Biodisk, Sweden). ESBLs were detected with the use of two disc diffusion methods: the double-disc synergy test (DDST) according to Jarlier et al. and the diagnostic disc (DD) test according to Appleton. Seventeen of examined strains belonged to the species Bacteroides fragilis, three--to B. ovatus/thetaiotaomicron, two--to B. distasonis, one--to B. uniformis and one--to B. stercoris/eggerthii. One strain (B. uniformis) did not produce catalase, whereas all strains produced beta-lactamases. Examined strains were susceptible in vitro to metronidazole, amoxicillin/clavulanic acid and imipenem. One clindamycin-resistant strain was detected (B. fragilis). Occurrence of ESBL-type enzymes was confirmed in 22 strains of following species: B. fragilis (17 strains), B. ovatus/thetaiotaomicron (3), B. distasonis (1) and B. uniformis (1). Clinical strains of the B. fragilis group with a new mechanism of resistance to beta-lactam antibiotics appeared during last years in Poland. They produce extended-spectrum beta-lactamases (ESBLs), so they are resistant to penicillins, cephalosporins and monobactams. Monitoring of infections caused by these threatening strains in hospital patients is very important.

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metrazol antibiotic 2016-04-07

H. pylori eradication is usually performed with three or four drugs for at least seven days. Recently four reports have shown a cure rate of approximately 90% using a four-day quadruple therapy. The objectives of this prospective study were: 1) to evaluate the efficacy of pantoprazole-based quadruple Ceftin 250mg Tablets therapy, and 2) to compare the efficacy and tolerability of four-day with seven-day quadruple therapy.

metrazol 40mg tablets 2015-01-22

Spirochaetes are well known causative agents of diarrhoea in veterinary medicine. However, there is no agreement as to whether or not they have any clinical significance in humans. Metrogyl Gel Plus Usage

metrazol 250 mg 2015-08-27

Overall eradication was achieved in 69% (n = 212) of the patients, and ulcer healing in 76% (n = 233): 57% in the OA group, 80% in the CTT group, and 81% in the NTT group (P < 0.01 when comparing the OA group with the others). Ulcer healing was achieved in 90% of H. pylori-eradicated patients and in only 45% of patients with eradication therapy failure (P < 0.001). Similar results were obtained when Purbac Tablet only patients treated with NTT were considered: ulcer healing in 90% of patients with the organisms eradicated. Eradication of H. pylori (odds ratio (OR), 11.8; 95% confidence interval (CI), 6.3-22) and sex (OR, 2.5; 95% CI, 1.2-5.1) were the only variables that correlated with ulcer healing in the multivariate analysis. The ulcer persisted despite successful eradication of H. pylori in 22 patients. The duodenal ulcer had healed spontaneously in 73% of these patients at the 2nd control endoscopy. Finally, by the 3rd control endoscopy, only three patients still had duodenal ulcer. Therefore, ulcer healing was finally achieved in 98.1% (95-99%) of patients in whom H. pylori was eradicated. Gastrin, pepsinogen I, acid output, and the secretin test had normal values in all patients.

metrazol online kopen 2017-01-12

Antibiotics are the most widely prescribed category of drugs issued on prescription by general dental practitioners. Despite this there remains little evidence-based literature on what should be prescribed for any given clinical situation, at what dosage and for how long. Given the current climate of evidence-based research, the need to keep antibiotic prescribing to an acceptable minimum, increasing levels of resistance of micro-organisms and widespread hospital infections with 'superbugs', there is Climadan Acne Review a distinct need for appropriate prescribing guidelines. Considering best practice, an extensive review of the literature and a thorough understanding of current empirical treatment regimes, an attempt has been made to recommend suitable antibiotic prescribing for the adult patient suffering from acute dentoalveolar infections based on evidence.

metrazol medication 2016-01-07

Enterococcus casseliflavus and Enterococcus gallinarum strains resistant to metronidazole, nitrofurantoin and nitrofurazone were isolated from fecal samples of a patient with recurrent ulcerative colitis treated with metronidazole. Unlike other metronidazole-resistant bacteria, these strains produced nitroreductase but metabolized metronidazole to compounds that could not be detected by liquid chromatography with UV or mass spectral analysis. Metronidazole-susceptible Clostridium perfringens grew equally well in spent cultures of Enterococcus spp. incubated with or without metronidazole. These data indicate that the nitroreductases produced by these Enterococcus strains Amoclan Bid 875 Mg did not activate metronidazole to bactericidal metabolites and these bacteria may reduce the effectiveness of metronidazole. We have indirect evidence for an alternative pathway that results in metronidazole resistance. These strains of enterococcus had nitroreductase so resistance should not have occurred.

metrazol drug 2015-06-08

The data on orofacial granulomatosis, OFG, in children are sparse. We describe here 8 pediatric patients presenting with OFG, 2 of these cases associating with Crohn's disease. Therapeutic agents included systemic immunosuppressants such as glucocorticoids, methotrexate, anti-TNF-alpha agent, dapsone, antibiotics (metronidazole), and local treatment with topical tacrolimus or intralesional injections of triamcinolone hexacetonide. The treatment response ranged from good to poor results. The number of young patients Orelox Pediatric Dose suffering from OFG is not currently known and there are no gold standards for treatment. Thus, prospective follow-up studies on these patients are needed to gain more experience of the therapeutic responses.

metrazol antibiotic 400mg 2017-06-19

The vaginal probiotics can increase the clinical and microbiological efficacy of the therapeutic regimens used for the treatment of bacterial vaginosis. The Aim of our study was to evaluate the effect of the application of Lactobacillus casei var rhamnosus (Gynophilus--probiotic species Lcr 35) in restoring the vaginal flora and prevention of relapses by female patients with anaerobic vaginal Myambutol Drug Class infection undergoing conventional (nitroimidazole) local and main therapy.

metrazol tablet 2016-03-22

The effect of extended prophylactic antibiotic therapy on postoperative infective complications such as wound infection and intra-abdominal Azilide Tablet Uses abscess for non-perforated appendicitis is poorly defined.

metrazol 20 mg 2016-05-06

To investigate the Macropen Capsule inhibitory effects of emodin, baicalin, etc. on the hefA gene of multidrug resistance (MDR) in Helicobacter pylori (H. pylori).

metrazol gel 2015-10-07

Metronidazole, 1.5 g/day for 3 weeks, seems to be an effective, available, well-tolerated alternative for treatment of human fascioliasis.

metrazol antibiotic 2016-12-25

Retrospective analysis of data from a prospective cohort study.

metrazol 40mg tablets 2016-01-22

This level-S3 consensus guideline was developed in accordance with the recommendations of the Association of Scientific Medical Societies in Germany (Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften, AWMF). It was commissioned by the German Association for Digestive and Metabolic Diseases (Deutsche Gesellschaft für Verdauungs- und Stoffwechselkrankheiten, DGVS) and prepared in cooperation with other scientific societies. After search terms were compiled, a systematic, IT-supported literature search was performed in the PubMed and Cochrane databases. The search was restricted to articles that appeared in German or English from 2000 onward.