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Etambutol (Myambutol)

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Etambutol is an antibacterial agent. It works by stopping the growth of TB cells, which results in cell death. Etambutol is used for treating tuberculosis (TB) infections of the lung along with other medicines. It may also be used to treat other conditions as determined by your doctor.

Other names for this medication:
Combutol, Ethambutol, Myambutol, Rifafour, Rimstar

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Also known as:  Myambutol.


Etambutol is a prescription medication used to treat tuberculosis (TB). Etambutol belongs to a group of drugs called antimycobacterial antibiotics. TB is caused by a certain bacteria. Etambutol works by stopping the bacteria from forming a cell wall, which kills the bacteria.

This medication comes in tablet form. It is taken once a day with or without food.

Common side effects of Etambutol include loss of appetite, upset stomach, and numbness or tingling in hands and feet.


Initial Treatment: In patients who have not received previous antituberculous therapy, administer Etambutol 15 mg/kg (7 mg/ lb) of body weight, as a single oral dose once every 24 hours. In the more recent studies, isoniazid has been administered concurrently in a single, daily, oral dose.

Retreatment: In patients who have received previous antituberculous therapy, administer Etambutol 25 mg/kg (11 mg/lb) of body weight, as a single oral dose once every 24 hours. Concurrently administer at least one other antituberculous drug to which the organisms have been demonstrated to be susceptible by appropriate in-vitro tests. Suitable drugs usually consist of those not previously used in the treatment of the patient. After 60 days of Etambutol administration, decrease the dose to 15 mg/kg (7mg/ lb) of body weight, and administer as a single oral dose once every 24 hours.

During the period when a patient is on a daily dose of 25 mg/kg, monthly eye examinations are advised.


If you take too much Etambutol, call your local Poison Control Center or seek emergency medical attention right away.


Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F) away from moisture and heat. 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 Etambutol 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.


Lab tests, including liver and kidney function, complete blood cell counts, and vision, may be performed while you use Etambutol. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.

Etambutol should not be used in CHILDREN younger than 13 years old; safety and effectiveness in these children have not been confirmed.

PREGNANCY and BREAST-FEEDING: If you become pregnant, contact your doctor. You will need to discuss the benefits and risks of using Etambutol while you are pregnant. Etambutol is found in breast milk. If you are or will be breast-feeding while you use Etambutol, check with your doctor. Discuss any possible risks to your baby.

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As regards relapse rate, this 2HRZE/4H2R2 regimen is effective and useful for the expansion of DOT, and it should be expanded nationally in Japan.

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The study was designed to evaluate the toxicity of anti-TB drugs in male Wistar rats and possible ameliorative effects of kolaviron (KV), a biflavonoid from Garcinia kola seeds.

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The incidence of renal tuberculosis has decreased considerably in recent years, but the disease has not been eradicated completely. Sixty-six patients were treated for renal tuberculosis at St. Vincent's Hospital, Dublin, Ireland, from 1964 to 1974. Seventy-five per cent of these patients were under fifty years of age. Diagnosis can be made by Lowenstein-Jensen culture of early morning urine samples. The best drugs for treatment of renal tuberculosis are probably isoniazid, ethambutol, and rifamycin. All patients should be treated for eighteen months to two years and carefully followed since reactivation of the infection is not uncommon. Radical, extirpative surgery has a smaller part to play than chemotherapy in the treatment of renal tuberculosis.

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[3H]-uridine was incorporated by Mycobacterium bovis BCG with increasing intensity as the incubation period was increased. Rifampicin and isoniazid inhibited incorporation of the label rapidly. Similar inhibition was seen with M. tuberculosis H37Rv and several clinical isolates of M. tuberculosis both in axenic medium and inside macrophages. Ofloxacin and ciprofloxacin were both inhibitory but clofazimine was not. The combination of rifampicin with either isoniazid or ethambutol produced enhanced killing, but the combination of ethambutol and isoniazid was not synergic. Mycobacterium avium-intracellulare isolates from AIDS patients were less susceptible to rifampicin and were unaffected by isoniazid, ethambutol, clofazimine, ofloxacin and ciprofloxacin. The results obtained by inhibition of [3H]-uridine incorporation by intracellular mycobacteria correlated with conventional in-vitro MICs and was reproducible and rapid; a definitive result was obtainable within seven days.

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A total of 6743 pulmonary tuberculosis cases (4903 males, 1840 females) were included in this study. The treatment success rate (including cured and complete treatment) was 88% (95%CI 87%-89%). One hundred and eight-six (2.8%) patients died and 401 (5.9%) patients defaulted treatment. In multivariate analysis, treatment success was found to be associated with young age, lack of cavitation and compliance with treatment.

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The aim of this study was to establish wild-type MIC distributions of first-line drugs for Mycobacterium tuberculosis, as well as to explore the usefulness of such distributions when setting clinical breakpoints.

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A thirty-six year old male patient was admitted with abdominal pain, diarrhea, nausea, vomiting and fever which had started one week before. The patient had been followed up with predialisis Chronic Renal Failure(CRF) diagnosis for 4 years and receiving continuous ambulatory peritoneal dialysis (CAPD) treatment for 4 months. In peritoneal fluid, 1600/mm3 cells were detected and 70% of them were polymorphonuclear leukocytosis. The patient begun nonspesific antibiotherapy but no benefit was obtained after 12 days and peritoneal fluid bacterial cultures remained negative. Peritoneal smear was positive for Asid-fast basilli (AFB), and antituberculosis therapy was started with isoniazid, rifampicine, ethambutol and pyrazinamide. After 15 days his peritoneal fluid cell count was decreased and his symptoms were relieved. Peritoneal fluid tuberculosis culture was found positive.

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Development of severe sepsis is inevitable following inadvertent intravascular BCG administration. Therefore, urologists should warn and inform not only their patients and families but also healthcare workers such as nurses regarding the route of administration of the BCG treatment for bladder cancer. Our experience also proved that such a serious complication can be successfully treated if promptly acted.

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Multidrug-resistant (MDR) Mycobacterium tuberculosis and extrensively drug-resistant (XDR) M. tuberculosis are emerging public health threats whose threats are compounded by the fact that current techniques for testing the susceptibility of M. tuberculosis require several days to weeks to complete. We investigated the use of high-performance liquid chromatography (HPLC)-based quantitation of mycolic acids as a means of rapidly determining drug resistance and susceptibility in M. tuberculosis. Standard susceptibility testing and determination of the MICs of drug-susceptible (n = 26) and drug-resistant M. tuberculosis strains, including MDR M. tuberculosis strains (n = 34), were performed by using the Bactec radiometric growth system as the reference method. The HPLC-based susceptibilities of the current first-line drugs, isoniazid (INH), rifampin (RIF), ethambutol (EMB), and pyrazinamide (PZA), were determined. The vials were incubated for 72 h, and aliquots were removed for HPLC analysis by using the Sherlock mycobacterial identification system. HPLC quantitation of total mycolic acid peaks (TMAPs) was performed with treated and untreated cultures. At 72 h, the levels of agreement of the HPLC method with the reference method were 99.5% for INH, EMB, and PZA and 98.7% for RIF. The inter- and intra-assay reproducibilities varied by drug, with an average precision of 13.4%. In summary, quantitation of TMAPs is a rapid, sensitive, and accurate method for antibiotic susceptibility testing of all first-line drugs currently used against M. tuberculosis and offers the potential of providing susceptibility testing results within hours, rather than days or weeks, for clinical M. tuberculosis isolates.

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Rifampicin and isoniazid are known to interact with each other in solid formulation environment to yield isonicotinyl hydrazone (HYD). In earlier studies, this reaction was indicated to be catalyzed by pyrazinamide and ethambutol hydrochloride, the two other co-drugs present in oral anti-tuberculosis fixed-dose combination (FDC) formulations. Accordingly, the present study was carried out to understand the catalytic role of pyrazinamide and ethambutol hydrochloride on the reaction between rifampicin and isoniazid. For the purpose, organic bases and amides similar in structure to pyrazinamide and ethambutol hydrochloride were combined individually with rifampicin and isoniazid. The compounds employed were pyrazine, piperdine, pyrollidine, pyridine, triethylamine, diisopropylethylamine, picolinamide, benzamide, ethylenediamine, ethanolamine, diethanolamine, and triethanolamine. An additional study was also carried out in the presence of free base of ethambutol. The mixtures were exposed to accelerated stability test condition of 40 degrees C/75% RH for 15 d. The nature of the products formed and the changes in relative concentrations of the drugs and products were followed by HPLC. The drugs showed different extent of degradation, yielding HYD, and in some cases degradation products of rifampicin. The results confirmed the catalytic role of pyrazinamide and ethambutol hydrochloride. The catalysis is postulated to involve intra-molecular proton transfer during transhydrazone formation process, entailing a tetrahedral mechanism.

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Ethambutol is an efficacious antituberculosis agent. However, its use has been limited by the occurrence of ocular toxicity. To investigate characteristics and possible mechanisms of ethambutol ocular toxicity, we used primary rat retinal cultures as a model. Primary rat retinal cultures were obtained from newborn Sprague-Dawley rats and used for experiments after maturation (DIV > or = 10). Cytopathologic changes were examined under light and electron microscopes. Thy-1 (a membrane glycoprotein expressed by retinal ganglion neurons)-containing neurons and gamma-aminobutyric acid (GABA)-ergic neurons were identified immunocytochemically. Exposure of retinal cultures for 24-48 h to ethambutol induced cytoplasmic vacuolar changes and neuronal loss. Vacuolar changes were partially reversible with the termination of ethambutol exposure. Of neurons, Thy-1(+) ganglion neurons were more vulnerable than GABA(+) neurons. Glutamate antagonists, an antioxidant (trolox), or cycloheximide, did not attenuate either vacuolar changes or neuronal loss. A cell-permeant zinc chelator N,N,N',N'-tetrakis (2-pyridylmethyl) ethylenediamine (TPEN) markedly attenuated vacuolar degeneration and neuronal loss, while the addition of zinc augmented both. In rat retinal cultures, ethambutol induces reversible vacuolar degeneration as well as irreversible neuronal loss, more preferentially of Thy-1(+) ganglion neurons. Contrary to the current theories, ethambutol-induced retinal cytotoxicity in the present study is mediated not by excitotoxicity or zinc deficiency but by a mechanism requiring intracellular zinc. In addition, features of the ethambutol-induced cell death were not consistent with those of apoptosis.

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etambutol 400 mg prospect 2017-07-22

We report the in vitro drugs interaction by the resazurin drugs combination microtiter assay (REDCA) of amoxicillin (AMO)/clavulanate (CLAV) with isoniazid (INH), ethambutol (EMB), and rifampicin (RIF) against susceptible and resistant Mycobacterium tuberculosis isolates. The addition of AMO/CLAV Azitrox 250 Mg to classical antituberculosis drugs should be explored as a promising alternative for the treatment of resistant tuberculosis (TB).

etambutol 400 mg pret 2015-07-01

The patient charts of 334 patients in which an isolate of M. kansasii had been recorded were reviewed. We considered 220 patients to be suffering from disease caused by M. kansasii (American Thoracic Society criteria along with probable disease according to established definitions). The disease was more frequent in male patients (n=185; 84.1%) and in individuals who were not HIV positive (n=184; 83.6%). The highest incidence of disease in the Bizkaia region was found in Margen Izquierda-Encartaciones, where the rate was 8.05 per 100 000 inhabitants. In Amoxidal 250 Suspension Pediatrica the Bilbao area, the highest rate was found in the districts lying on the outskirts. The underlying diseases were tuberculosis (20.5%), chronic obstructive pulmonary disease (25.9%), pulmonary neoplasia (7.7%), silicosis (0.9%), chronic liver disease (11.4%), and duodenal ulcer (8.6%). The most frequent constitutional symptoms were fever (39.1%), loss of appetite (23.2%), and weight loss (33.3%). Among the respiratory symptoms, the most outstanding were cough (70.9%) and expectoration (62.3%). The most frequent radiographic patterns were cavitation and pulmonary infiltration. The most common treatment regimen was rifampicin, isoniazid, and ethambutol (43.4%), and the average duration was 12 months in patients who were HIV negative. Analysis of antibiotic sensitivity, performed on 56 strains, revealed that 100% were resistant to isoniazid, while none displayed rifampicin resistance. Thirty-four cases of disease caused by M. kansasii were compared with 68 cases of tuberculosis, all of them without HIV infection. The comparison revealed a predominance of smokers, respiratory symptoms, and cavitation in patients with disease caused by M. kansasii. The majority of the isolates (98.5%) corresponded to genotype I. A total of 8 clones were obtained; the clones designated 1 and 3 were more common in HIV-positive and HIV-negative individuals respectively.

etambutol 400 mg nombre comercial 2017-06-24

Physical examination, chest X-ray, transthoracic ultrasonography, pleural tap and drainage, bacterial and cytological Clindagel 1 Gel Price analyses of pleural fluid, bronchoscopy, microscopy and bacteriological culture of pleural exudates and bronchoalveolar lavage fluid, thoracic CT, thoracoscopy, histopathology of pleural biopsy, tuberculin skin test, nucleic acid amplification of mycobacterial RNA and DNA in the pleural fluid specimens and the parietal pleural biopsy, microscopy of sputum samples, ESAT-6-specific and CFP-10-specific interferon-gamma enzyme-linked immunospot assay on peripheral blood and pleural exudate mononuclear cells.

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A 41-year-old man underwent skeletal scintigraphy due to chronic pain in the left foot and polyarthralgia. He was taking medication for gout and had previously had sarcoidosis, for which he had Ciprofloxacin Teva 500 Mg Side Effects received corticosteroids and other therapy that was discontinued 4 years ago. Scintigraphy revealed a mass in the shaft of the left humerus that, according to biopsy, was an asymptomatic osteomyelitis caused by Mycobacterium avium. The shaft of the left humerus is an uncommon site for tuberculous osteomyelitis. A viable fistula remained after the biopsy that persisted despite pharmacologic treatment with ethambutol, rifabutin and clarithromycin. Four months later, sequestrectomy was performed with insertion of gentamicin-impregnated beads, which resulted in rapid resolution. The foot pain resolved spontaneously. The incidence of bone tuberculosis has increased over the last 2 decades. The most commonly affected sites are the spine and large joints. Infection with M. avium is sometimes involved. Because of the increasing incidence it is important to include mycobacterial infections in the differential diagnosis of focal bone lesions, especially when standard cultures are initially negative.

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This study aimed to clarify the cause of MR-MAC, to see Tricef Syrup Spc how its management affected outcome, and to compare its prognosis with that of MDR-TB.

etambutol 400 mg tab 2015-05-06

Tuberculous liver abscess has been reported in only fourteen patients in Japan and in twenty-nine patients outside Japan. Only nine of the non-Japanese patients and none of the Japanese patients have been treated for this condition without laparotomy. We report a patient who developed tuberculous liver abscess during treatment of tuberculous peritonitis. Diagnosis was made by ultrasound-guided aspiration biopsy, and the patient was treated with percutaneous drainage and transcatheter infusion of antituberculous agents. Direct infusion of antituberculous agents has more direct effects in the treatment of Klabax 500 Mg Usage an abscess than systemic chemotherapy alone. Therefore, if a percutaneous catheter can be safely placed, the use of transcatheter infusion of antituberculous agents should be considered.

etambutol 400 mg tabletas 2017-01-14

A 55-year-old man presented with the suspicion of pulmonary tuberculosis. He was treated with isoniazid, ethambutol, rifampicin and pyrazinamide. However, he developed high fever, skin rash and pulmonary infiltrates following 10 days of treatment. The above-mentioned conditions subsided promptly after stopping ethambutol therapy and reappeared after rechallenge, marking ethambutol as the offender. To present knowledge, this is Levofloxacin 150 Mg the second case of an ethambutol-induced hypersensitivity lung reaction reported in English literature.

etambutol 275 mg 2017-11-22

Patients were randomized to receive daily treatment with Tritab 200 Mg 4 drugs (rifampicin, isoniazid, pyrazinamide, ethambutol) given as an FDC (n = 798 patients) or separately (n = 787) in the 8-week intensive phase of treatment.

etambutol 20 mg 2015-12-10

El síndrome hemofagocítico secundario es infrecuente en pediatría y, más aun, asociado a tuberculosis. Presentamos el caso de una paciente con síndrome de inmunodeficiencia adquirida, tuberculosis diseminada y síndrome hemofagocítico. Niña de 8 años, condiagnóstico de síndrome deinmunodeficiencia adquirida, que se internó por fiebre, vómitos y dolor abdominal. Presentaba distensión abdominal, deshidratación, taquipnea, rales subcrepitantes y sibilancias en ambos pulmones, anemia, plaquetopenia y alteración de la coagulación. Recibió antibióticos de amplio espectro y se realizó una laparotomía exploradora con apendicectomia y biopsia ganglionar. A las 72 horas, presentó convulsión tónico clónica, deterioro del sensorio, fiebre, hipoxemia, hepatoesplenomegalia, ascitis y edema periférico. Presentaba bicitopenia, hiperferritinemia y examen microscópico de médula ósea con hemofagocitosis. Recibió gammaglobulina intravenosa, corticoides y transfusiones sanguíneas. Se aisló Mycobacterium tuberculosis del aspirado gástrico, médula ósea y biopsia ganglionar abdominal. Se trató con isoniacida, rifampicina, estreptomicina y etambutol, y presentó franca mejoría.

etambutol 150 mg 2015-12-26

A total of 111 previously treated adults admitted consecutively to the tuberculosis centre with sputum smear-positive pulmonary tuberculosis between June 1996 and July 1997 were included in the study. Information on potential risk factors for ADR was obtained from each patient, and human immunodeficiency virus (HIV) serostatus was determined. Drug susceptibility testing to the main anti-tuberculosis drugs was performed on cultures of Mycobacterium tuberculosis complex isolated from sputum samples of each patient by the indirect proportion method. All patients whose isolates tested resistant to at least one anti-tuberculosis drug were defined as having ADR.

etambutol atb 400 mg 2016-02-09

Retrospective studies were made of 20 cases of isolated epididymal tuberculosis defined as "tuberculosis infection affecting the epididymis without evidence of renal involvement as documented by the absence of acid fast bacilli in the urine sample and on imaging" among 35 patients with epididymal tuberculosis. Two weeks after the intensified anti-TB treatment by the combined therapy of Isoniazid + Rifampicin + Streptomycin or Ethambutol, all the patients underwent surgical removal of the tuberculous lesion, followed again by the combined therapy for 6-9 months.

etambutol 300 mg 2017-06-16

A group of 250 patients with new or enlarging apical lung lesions which were thought to be tuberculous, and who had positive tuberculin tests but negative sputum smears and cultures for Mycobacterium tuberculosis, were treated with an ultrashort (3-month), 4-drug (rifampicin, isoniazid, pyrazinamide and ethambutol) regimen. One patient developed bacteriologically positive pulmonary tuberculosis (PTB) during the treatment period and 35 others (14%) developed bacteriologically positive PTB after completing the drug regimen.