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Sulfamethoxazole and Trimethoprim (Sulfamethoxazole / Trimethoprim) - Summary




Sulfamethoxazole and trimethoprim is a synthetic antibacterial combination product available in DS (double strength) tablets, each containing 800 mg sulfamethoxazole and 160 mg trimethoprim; in tablets, each containing 400 mg sulfamethoxazole and 80 mg trimethoprim for oral administration.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of sulfamethoxazole and trimethoprim tablets and other antibacterial drugs, sulfamethoxazole and trimethoprim 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 empiric selection of therapy.

Sulfamethoxazole and trimethoprim is indicated for the following:

Urinary Tract Infections

For the treatment of urinary tract infections due to susceptible strains of the following organisms: Escherichia coli, Klebsiella species, Enterobacter species, Morganella morganii, Proteus mirabilis and Proteus vulgaris. It is recommended that initial episodes of uncomplicated urinary tract infections be treated with a single effective antibacterial agent rather than the combination.

Acute Otitis Media

For the treatment of acute otitis media in pediatric patients due to susceptible strains of Streptococcus pneumoniae or Haemophilus influenzae when in the judgment of the physician sulfamethoxazole and trimethoprim offers some advantage over the use of other antimicrobial agents. To date, there are limited data on the safety of repeated use of sulfamethoxazole and trimethoprim in pediatric patients under two years of age. Sulfamethoxazole and trimethoprim is not indicated for prophylactic or prolonged administration in otitis media at any age.

Acute Exacerbations of Chronic Bronchitis in Adults

For the treatment of acute exacerbations of chronic bronchitis due to susceptible strains of Streptococcus pneumoniae or Haemophilus influenzae when in the judgment of the physician sulfamethoxazole and trimethoprim offers some advantage over the use of a single antimicrobial agent.


For the treatment of enteritis caused by susceptible strains of Shigella flexneri and Shigella sonnei when antibacterial therapy is indicated.

Pneumocystis Carinii Pneumonia

For the treatment of documented Pneumocystis carinii pneumonia and for prophylaxis against Pneumocystis carinii pneumonia in individuals who are immunosuppressed and considered to be at an increased risk of developing Pneumocystis carinii pneumonia.

Traveler's Diarrhea in Adults

For the treatment of traveler's diarrhea due to susceptible strains of enterotoxigenic E. coli.

See all Sulfamethoxazole and Trimethoprim indications & dosage >>


Published Studies Related to Sulfamethoxazole and Trimethoprim (Sulfamethoxazole / Trimethoprim)

Randomized controlled trial of trimethoprim-sulfamethoxazole for uncomplicated skin abscesses in patients at risk for community-associated methicillin-resistant Staphylococcus aureus infection. [2010.09]
STUDY OBJECTIVE: Community-associated methicillin-resistant Staphylococcus aureus is now the leading cause of uncomplicated skin abscesses in the United States, and the role of antibiotics is controversial. We evaluate whether trimethoprim-sulfamethoxazole reduces the rate of treatment failures during the 7 days after incision and drainage and whether it reduces new lesion formation within 30 days... CONCLUSION: After the incision and drainage of uncomplicated abscesses in adults, treatment with trimethoprim-sulfamethoxazole does not reduce treatment failure but may decrease the formation of subsequent lesions. Copyright (c) 2010 American College of Emergency Physicians. Published by Mosby, Inc. All rights reserved.

Standard versus newer antibacterial agents in the treatment of severe acute exacerbation of chronic obstructive pulmonary disease: a randomized trial of trimethoprim-sulfamethoxazole versus ciprofloxacin. [2010.07.15]
BACKGROUND. Although the use of antibiotics in the treatment of acute exacerbation of chronic obstructive pulmonary disease (COPD) is largely accepted, controversy remains regarding whether the choice of antibiotic has any impact on outcome.

Trimethopim-sulfamethoxazole compared with benzathine penicillin for treatment of impetigo in Aboriginal children: a pilot randomised controlled trial. [2010.03]
We conducted a pilot randomized controlled trial comparing trimethoprim-sulfamethoxazole to benzathine penicillin for treatment of impetigo in Aboriginal children. Treatment was successful in 7 of 7 children treated with trimethoprim-sulfamethoxazole and 5 of 6 treated with benzathine penicillin.Trimethoprim-sulfamethoxazole achieved microbiological clearance and healing of sores from which beta-hemolytic streptococci and community-associated methicillin-resistant Staphylococcus aureus were initially cultured.

Randomized controlled trial of trimethoprim-sulfamethoxazole for uncomplicated skin abscesses in patients at risk for community-associated methicillin-resistant Staphylococcus aureus infection. [2010]
within 30 days... CONCLUSION: After the incision and drainage of uncomplicated abscesses in adults,

Effect of long-term trimethoprim/sulfamethoxazole treatment on resistance and integron prevalence in the intestinal flora: a randomized, double-blind, placebo-controlled trial in children. [2009.05]
OBJECTIVES: The aim of this study was to test the hypothesis that trimethoprim/sulfamethoxazole selects for integron-positive and multidrug-resistant Enterobacteriaceae in the intestinal flora... CONCLUSIONS: Initially, trimethoprim/sulfamethoxazole usage was strongly associated with the appearance of integron-positive (multi)drug-resistant Enterobacteriaceae in the intestinal flora. After prolonged exposure to trimethoprim/sulfamethoxazole, however, this population of Enterobacteriaceae was substituted by a population with non-integron-associated resistance mechanisms. After trimethoprim/sulfamethoxazole was discontinued, susceptibility rates to all antibiotics returned to baseline levels.

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Clinical Trials Related to Sulfamethoxazole and Trimethoprim (Sulfamethoxazole / Trimethoprim)

Sulfamethoxazole Drug Interaction Study With MMX� Mesalazine/Mesalamine [Recruiting]
This is a drug interaction study evaluating the pharmacokinetic profiles of Sulfamethoxazole administered alone & in combination with MMX Mesalazine/mesalamine.

Trimetrexate Plus Leucovorin Calcium Rescue Versus Sulfamethoxazole-Trimethoprim in the Treatment of Pneumocystis Carinii Pneumonia (PCP) in Patients With AIDS [Completed]
To compare the safety and effectiveness of an investigational drug therapy (trimetrexate plus leucovorin calcium) with that of conventional therapy (sulfamethoxazole-trimethoprim) in the treatment of moderately severe Pneumocystis carinii pneumonia (PCP) in patients who have AIDS, are HIV positive, or are at high risk for HIV infection. New treatments are needed to reduce the mortality rate from PCP in AIDS patients and to reduce the high relapse rate found after conventional therapy. Trimetrexate (TMTX) was chosen for this trial because it was found to be much more potent than sulfamethoxazole/trimethoprim (SMX/TMP) against the PCP organism in laboratory tests. Also TMTX, in combination with leucovorin (LCV), did not cause severe toxicity in a preliminary trial. It is believed that TMTX will be more effective in treating PCP and in preventing a recurrence of PCP.

Influence of Trimethoprim-Sulfamethoxazole for the Recurrence of Ocular Toxoplasmosis [Recruiting]
The protozoan Toxoplasma gondii is an obligate intracellular parasite, a common cause of intraocular inflammation in the world. The treatment of toxoplasmosis is the sulfonamide group of drugs, which acts on tachyzoites forms, no acting on bradyzoites, that grown from latent focus located on boards and are responsible for recurrence. The investigators study aims to determine the effect of prophylactic therapy with Trimethoprim-sulfamethoxazole on the recurrences of toxoplasma retinochoroiditis gondii. This is a randomized, double-masked, in patients with eye condition of acute Toxoplasma gondii retinochoroiditis. The study population consist of patients treated at Ophthalmology department, University of Campinas. They present symptoms compatible with a diagnosis of Recurrent ocular toxoplasmosis. Volunteers will be recruited with a previous diagnosis of chorioretinitis presumed Toxoplasma gondii, which show active lesions compatible with recurrence.

After the acute phase of treatment of all patients [1 tablet Trimethoprim-sulfamethoxazole (800/160mg) 12/12h during 45 days], the same Stratified by gender) will be randomized in a 1: 1 ratio between the group 1 (prophylactic treatment with trimethoprim-sulfamethoxazole tablet every other day) or group 2 (consisting of a placebo pill containing no active ingredient of similar appearance to trimethoprim-sulfamethoxazole, 1 time a day to day alternate). The definition of a patient with a recurrent episode of chorioretinitis Toxoplasmosis is the presence of old scars of chorioretinitis, associated with satellite active lesions chorioretinitis with positive IgG and IgM negative for toxoplasmosis. The patients will be tested for visual acuity, examination biomicroscopy, tonometry, fundus photography and indirect ophthalmoscopy. In each study, patients will be randomized in blocks of four (two in group I and two Group II) with stratification by gender. The primary outcome is incidence of episodes of recurrent chorioretinitis by toxoplasmosis in the follow up of 12 months. It was planned a minimum sample of 140 patients (70 in group I and 70 in group II). Assuming an incidence of 6% recurrence in group A, this sample will have a 80% power to detect a difference of 18% between groups. The results of this analysis will be considered significant if p <0. 05.

Effect of Weight and/or Obesity on Sulfamethoxazole and Trimethoprim Concentrations [Recruiting]
This study will find how weight affects the dosing of a drug called sulfamethoxazole and trimethoprim. Currently, the amount of sulfamethoxazole and trimethoprim a patient receives is the same regardless of the patient's weight.

All sulfamethoxazole and trimethoprim (Trade name is Bactrim or Septra) medication that you will receive in this study will be referred to as study medication within this informed consent form. This drug is a combination of two antibiotics, sulfamethoxazole and trimethoprim, which belongs to a class of medication known as "sulfones" and is approved by the US Food and Drug Administration (FDA) for the treatment of a wide variety of bacterial infections such as ear infections, urinary tract infections, bronchitis, traveler's diarrhea, and Pneumocystis carinii pneumonia. Sulfamethoxazole and trimethoprim is given orally.

Study of Trimethoprim/Sulfamethoxazole as PCP Prophylaxis in CTD Patients [Recruiting]
Evaluation the efficacy and safety profile of trimethoprim/sulfamethoxazole as Pneumocystis carinii pneumonia (PCP) prophylaxis in Patients With Connective Tissue Diseases (CTD) treated with high-dose glucocorticoids and immunosuppressive agents.

Open-labeled, randomized, prospective single-center clinical trial. Observation period of 12 weeks.

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Reports of Suspected Sulfamethoxazole and Trimethoprim (Sulfamethoxazole / Trimethoprim) Side Effects

Renal Failure Acute (41)Pyrexia (38)Rash (37)Stevens-Johnson Syndrome (21)Hyperkalaemia (17)Thrombocytopenia (17)Dizziness (16)Nausea (16)Asthenia (16)Pruritus (15)more >>

Page last updated: 2013-02-10

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