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Acute, recurrent or chronic urinary tract infections (primarily pyelonephritis, pyelitis and cystitis) due to susceptible organisms (usually Escherichia coli, Klebsiella-Enterobacter, staphylococcus, Proteus mirabilis and, less frequently, Proteus vulgaris) in the absence of obstructive uropathy or foreign bodies.
Meningococcal meningitis prophylaxis when sulfonamide-sensitive group A strains are known to prevail in family groups or larger closed populations. (The prophylactic usefulness of sulfonamides when group B or C infections are prevalent has not been proven and in closed population groups may be harmful.)
Trachoma. Inclusion conjunctivitis. Nocardiosis. Chancroid. Toxoplasmosis as adjunctive therapy with pyrimethamine. Malaria due to chloroquine-resistant strains of Plasmodium falciparum, when used as adjunctive therapy.
Currently, the increasing frequency of resistant organisms is a limitation of the usefulness of antibacterial agents including the sulfonamides, especially in the treatment of chronic and recurrent urinary tract infections.
Important Note:In vitro sulfonamide susceptibility tests are not always reliable. The test must be carefully coordinated with bacteriologic and clinical response. When the patient is already taking sulfonamides, follow-up cultures should have aminobenzoic acid added to the culture media.
DOSAGE AND ADMINISTRATION
Systemic sulfonamides are contraindicated in infants less than 2 months of age, except in the treatment of congenital toxoplasmosis as adjunctive therapy with pyrimethamine.
Usual Dose for Pediatric Patients Over 2 Months of Age: Initial dose: One half of the 24-hour dose. Maintenance dose: 150 mg/kg/24 hours or 4 gm/M²/24 hours - dose to be divided into 4 to 6 doses/24 hours. The maximum dose should not exceed 6 gm/24 hours.
Pediatric Suspension (raspberry flavored), containing acetyl sulfisoxazole equivalent to approximately 0.5 gm sulfisoxazole per teaspoonful (5 mL) - bottles of 16 oz (1 pint) (NDC 0004-1003-28).
Revised: November 1997. Roche Laboratories Inc. 340 Kingsland Street, Nutley, New Jersey 07110 - 1199. FDA rev date: 12/23/1996This monograph has been modified to include the generic and brand name in many instances.
Last reviewed on RxList: 9/16/2008
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