Trimethoprim/sulfamethoxazole generally kills bacteria,[2] by blocking the microorganisms' ability to make and to use folate.[2]
Pneumocystis jirovecii pneumonia
Trimethoprim/sulfamethoxazole (TMP/SMX) is the medicine most commonly used to prevent Pneumocystis jirovecii pneumonia (PCP)[12] People who get Pneumocystis pneumonia have a medical condition that weakens their immune system, like HIV/AIDS, or take medicines (such as corticosteroid, monoclonal antibody and immunosuppressants) that reduce the body's ability to fight bacterial and viral infections. People with HIV/AIDS are less likely to get Pneumocystis pneumonia as a result of antiretroviral therapy (ART). However, Pneumocystis pneumonia is still a substantial public health problem. Most of what is scientifically known about Pneumocystis pneumonia and its treatment comes from studying people with HIV/AIDS.[12]
Susceptibility
Organisms against which trimethoprim/sulfamethoxazole can be effective include:[13][14]
Its use during pregnancy is contraindicated, although it has been placed in Australian pregnancy category C.[13] Its use during the first trimester (during organogenesis) and 12 weeks prior to pregnancy has been associated with an increased risk of congenital malformations, especially malformations associated with maternal folic acid deficiency (which is most likely related to the mechanism of action of co-trimoxazole) such as neural tube defects such as spina bifida, cardiovascular malformations (e.g. Ebstein's anomaly), urinary tract defects, oral clefts, and club foot in epidemiological studies.[13] Its use later on during pregnancy also increases the risk of preterm labour (odds ratio: 1.51) and low birth weight (odds ratio: 1.67).[17][18] Animal studies have yielded similarly discouraging results.[3]
It appears to be safe for use during breastfeeding as long as the baby is healthy.[19]
Babies
Its use in those less than 2 months of age is not recommended due to the risk of adverse side effects.[20]
Antibacterials like dapsone (increases plasma levels of both drugs), methenamine (increased risk of crystalluria) and rifampicin (as it may lead to an increased plasma level of rifampicin and lower plasma levels of trimethoprim)
Anticoagulants like warfarin and acenocoumarol — anticoagulant effects of either drug is potentiated by this combination
Antifolates like pyrimethamine, proguanil and methotrexate increase the risk of associated side effects like bone marrow toxicity, folic acid supplementation should be considered. A significant risk of megaloblastic anaemia exists with doses of pyrimethamine in excess of 25 mg/wk.
Antivirals, more specifically, lamivudine (increased plasma concentrations of lamivudine), zalcitabine (increased plasma concentrations of zalcitabine) and zidovudine (increased risk of haematological reactions)
Procainamide and/or amantadine may have their plasma concentrations increased bilaterally or unilaterally.
Clozapine and other antipsychotics — increased risk of haematological side effects
Digoxin — increase in digoxin levels in a proportion of elderly patients
Diuretics — elderly patients receiving thiazide diuretics are at a heightened risk for developing thrombocytopaenia while on co-trimoxazole
Ciclosporin — patients who have received a kidney transplant and are receiving co-trimoxazole and ciclosporin concomitantly are at an increased risk of having a reversible deterioration in their kidney function.
Spironolactone — concurrent use can increase the likelihood of hyperkalemia, especially in the elderly. The trimethoprim portion acts to prevent potassium excretion in the distal tubule of the nephron.[23]
Potassium aminobenzoate — effects of sulfonamides (like Sulfamethoxazole) inhibited.
Laboratory tests — trimethoprim and sulfonamides have been reported to interfere with diagnostic tests, including serum-methotrexate and elevated serum creatinine levels,[24] also urea, urinary glucose and urobilinogen tests.
Alkalinisation of the urine may reduce the toxicity of sulfamethoxazole, but it may increase the toxic effects of trimethoprim.[3]
Pharmacology
The synergy between trimethoprim and sulfamethoxazole was first described in the late 1960s.[25][26][27] Trimethoprim and sulfamethoxazole have a greater effect when given together than when given separately, because they inhibit successive steps in the folate synthesis pathway. They are given in a one-to-five ratio in their tablet formulations so that when they enter the body their concentration in the blood and tissues is roughly one-to-twenty — the exact ratio required for a peak synergistic effect between the two.[14]
Sulfamethoxazole, a sulfonamide, induces its therapeutic effects by interfering with the de novo (that is, from within the cell) synthesis of folate inside microbial organisms such as protozoa, fungi and bacteria. It does this by competing with p-aminobenzoic acid (PABA) in the biosynthesis of dihydrofolate.[14]
Trimethoprim serves as a competitive inhibitor of dihydrofolate reductase (DHFR), hence inhibiting the de novo synthesis of tetrahydrofolate, the biologically active form of folate.[14]
Tetrahydrofolate is crucial in the synthesis of purines, thymidine, and methionine which are needed for the production of DNA and proteins[28] during bacterial replication.
The effects of trimethoprim causes a backlog of dihydrofolate (DHF) and this backlog can work against the inhibitory effect the drug has on tetrahydrofolate biosynthesis. This is where the sulfamethoxazole comes in; its role is in depleting the excess DHF by preventing it from being synthesised in the first place.[14]
Co-trimoxazole was claimed to be more effective than either of its components individually in treating bacterial infections, although this was later disputed.[29][30]
Generally accepted treatment for shigellosis.[42] A recent Cochrane review found that while it is an effective treatment for shigellosis it also produces more significant adverse effects than other antibiotic drugs.[43]
Its use as a prophylactic treatment is supported by one clinical trial involving children with acute lymphoblastic leukaemia.[59] Other than this and one other clinical trial into its efficacy as a treatment for pneumocystis pneumonia,[60] data on its use in both the treatment and prevention of pneumocystis pneumonia is significantly lacking.
Clinical trials have confirmed its prophylactic and therapeutic utility in cases of toxoplasmosis.[61][62][63][64][65][66]
Brand names
Trimethoprim/sulfamethoxazole may be abbreviated as SXT, SMZ-TMP, TMP-SMX, TMP-SMZ, or TMP-sulfa.[citation needed] The generic British Approved Name (BAN) Co-trimoxazole is used for trimethoprim/sulfamethoxazole manufactured and sold by many different companies.[67]
The following list of brand names is incomplete:
Bactrim, Bactrimel (manufactured by Roche and distributed in Europe)
Bactrom (Venezuela)
Bibactin (manufactured by PPM and distributed in Cambodia and some African countries)
^ abcdefghij"Co-trimoxazole". The American Society of Health-System Pharmacists. Archived from the original on 6 September 2015. Retrieved 1 August 2015.
^ abcHamilton R (2015). Tarascon Pocket Pharmacopoeia 2015 Deluxe Lab-Coat Edition. Jones & Bartlett Learning. p. 105. ISBN9781284057560.
^World Health Organization (2023). The selection and use of essential medicines 2023: web annex A: World Health Organization model list of essential medicines: 23rd list (2023). Geneva: World Health Organization. hdl:10665/371090. WHO/MHP/HPS/EML/2023.02.
^ abcdefgWormser GP, Keusch GT, Heel RC (December 1982). "Co-trimoxazole (trimethoprim-sulfamethoxazole): an updated review of its antibacterial activity and clinical efficacy". Drugs. 24 (6): 459–518. doi:10.2165/00003495-198224060-00002. PMID6759092. S2CID209121818.
^"Tularemia"(PDF). Infectious Disease Epidemiology Section. Louisiana Office of Public Health. 17 July 2011. Archived(PDF) from the original on 23 February 2014. Retrieved 12 February 2014.
^ abc"Sulfamethoxazole / trimethoprim Pregnancy and Breastfeeding Warnings". Archived from the original on 6 September 2015. Retrieved 31 August 2015. An extensive systematic review of sulfonamide usage near term and during breastfeeding found no side effects in infants; the authors concluded that use of this combination drug during breastfeeding presents no risk of neonatal kernicterus... LactMed: Use is considered acceptable when breastfeeding healthy, full-term infants after the newborn period
^Rossi S, ed. (2013). Australian Medicines Handbook (2013 ed.). Adelaide: The Australian Medicines Handbook Unit Trust. ISBN978-0-9805790-9-3.
^Juvet T, Gourineni VC, Ravi S, Zarich SW (September 2013). "Life-threatening hyperkalemia: a potentially lethal drug combination". Connecticut Medicine. 77 (8): 491–3. PMID24156179.
^Gentry CA, Nguyen AT (December 2013). "An evaluation of hyperkalemia and serum creatinine elevation associated with different dosage levels of outpatient trimethoprim-sulfamethoxazole with and without concomitant medications". The Annals of Pharmacotherapy. 47 (12): 1618–26. doi:10.1177/1060028013509973. PMID24259630. S2CID19395548.
^Böhni E (1969). "[Comparative bacteriological investigations with the combination trimethoprim/sulfamethoxazole in vitro and in vivo]". Chemotherapy. 14 (Suppl): Suppl:1–Suppl21. doi:10.1159/000220651. PMID4908562.
^Böhni E (November 1969). "Chemotherapeutic activity of the combination of trimethoprim and sulphamethoxazole in infections of mice". Postgraduate Medical Journal. 45 (Suppl): Suppl:18–Suppl:21. PMID4902845.
^"Tetrahydrofolic acid". PubChem. U.S. National Library of Medicine. Archived from the original on 26 February 2018. Retrieved 26 February 2018.
^Brumfitt W, Hamilton-Miller JM (December 1993). "Reassessment of the rationale for the combinations of sulphonamides with diaminopyrimidines". Journal of Chemotherapy. 5 (6): 465–469. doi:10.1080/1120009X.1993.11741097. PMID8195839.
^van der Veen EL, Rovers MM, Albers FW, Sanders EA, Schilder AG (May 2007). "Effectiveness of trimethoprim/sulfamethoxazole for children with chronic active otitis media: a randomized, placebo-controlled trial". Pediatrics. 119 (5): 897–904. doi:10.1542/peds.2006-2787. hdl:1874/25986. PMID17473089. S2CID23835227.
^Leiberman A, Leibovitz E, Piglansky L, Raiz S, Press J, Yagupsky P, et al. (March 2001). "Bacteriologic and clinical efficacy of trimethoprim-sulfamethoxazole for treatment of acute otitis media". The Pediatric Infectious Disease Journal. 20 (3): 260–264. doi:10.1097/00006454-200103000-00009. PMID11303827. S2CID45262990.
^Ericsson CD, Johnson PC, Dupont HL, Morgan DR, Bitsura JA, de la Cabada FJ (February 1987). "Ciprofloxacin or trimethoprim-sulfamethoxazole as initial therapy for travelers' diarrhea. A placebo-controlled, randomized trial". Annals of Internal Medicine. 106 (2): 216–220. doi:10.7326/0003-4819-106-2-216. PMID3541724.
^Ericsson CD, DuPont HL, Mathewson JJ, West MS, Johnson PC, Bitsura JA (January 1990). "Treatment of traveler's diarrhea with sulfamethoxazole and trimethoprim and loperamide". JAMA. 263 (2): 257–261. doi:10.1001/jama.1990.03440020091039. PMID2403603.
^Nordin K, Hallander H, Fredriksson T, Rylander C (1978). "A clinical and bacteriological evaluation of the effect of sulphamethoxazole-trimethoprim in acne vulgaris, resistant to prior therapy with tetracyclines". Dermatologica. 157 (4): 245–253. doi:10.1159/000250840. PMID150980.
^Chetchotisakd P, Chaowagul W, Mootsikapun P, Budhsarawong D, Thinkamrop B (January 2001). "Maintenance therapy of melioidosis with ciprofloxacin plus azithromycin compared with cotrimoxazole plus doxycycline". The American Journal of Tropical Medicine and Hygiene. 64 (1–2): 24–27. doi:10.4269/ajtmh.2001.64.24. PMID11425157.
^Sureshbabu J, Venugopalan P, Abuhammour W (25 June 2012). Fennelly G, Windle ML, Lutwick LI, Tolan Jr RW, Steele RW (eds.). "Shigella Infection Medication". Medscape Reference. WebMD. Archived from the original on 8 January 2014. Retrieved 8 January 2014.
^Grim SA, Rapp RP, Martin CA, Evans ME (February 2005). "Trimethoprim-sulfamethoxazole as a viable treatment option for infections caused by methicillin-resistant Staphylococcus aureus". Pharmacotherapy. 25 (2): 253–264. doi:10.1592/phco.25.2.253.56956. PMID15767239. S2CID31546680.
^Agrawal AK, Chang PP, Feusner J (January 2011). "Twice weekly Pneumocystis jiroveci pneumonia prophylaxis with trimethoprim-sulfamethoxazole in pediatric patients with acute lymphoblastic leukemia". Journal of Pediatric Hematology/Oncology. 33 (1): e1 –e4. doi:10.1097/MPH.0b013e3181fd6fca. PMID21102354. S2CID42371307.
^Safrin S, Finkelstein DM, Feinberg J, Frame P, Simpson G, Wu A, et al. (May 1996). "Comparison of three regimens for treatment of mild to moderate Pneumocystis carinii pneumonia in patients with AIDS. A double-blind, randomized, trial of oral trimethoprim-sulfamethoxazole, dapsone-trimethoprim, and clindamycin-primaquine. ACTG 108 Study Group". Annals of Internal Medicine. 124 (9): 792–802. doi:10.7326/0003-4819-124-9-199605010-00003. PMID8610948. S2CID40999772.
^Canessa A, Del Bono V, De Leo P, Piersantelli N, Terragna A (February 1992). "Cotrimoxazole therapy of Toxoplasma gondii encephalitis in AIDS patients". European Journal of Clinical Microbiology & Infectious Diseases. 11 (2): 125–130. doi:10.1007/BF01967063. PMID1396726. S2CID13621055.
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