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# Septran (Co-trimoxazole)
## Overview
Co-trimoxazole is a combination antibiotic of trimethoprim and sulfamethoxazole, acting synergistically to inhibit folic acid synthesis.
## Primary Indications
* **Urinary Tract Infections (UTIs)**: For acute uncomplicated UTIs and prophylaxis.
* **Pneumocystis jirovecii pneumonia (PCP)**: Treatment and prophylaxis.
* **Bacterial infections**: Including otitis media, bronchitis, and Shigella infections.
## Adult Dosing
* **UTIs**: 160 mg trimethoprim/800 mg sulfamethoxazole (1 DS tablet) twice daily for 3-7 days (acute) or daily for prophylaxis.
* **PCP Treatment**: 160 mg trimethoprim/800 mg sulfamethoxazole (1 DS tablet) every 8 hours for 14-21 days.
* **PCP Prophylaxis**: 160 mg trimethoprim/800 mg sulfamethoxazole (1 DS tablet) daily or three times weekly.
* **Other Infections**: 160 mg trimethoprim/800 mg sulfamethoxazole (1 DS tablet) every 12 hours. Dosing duration varies by infection.
* Maximum dose: Generally no more than 960 mg trimethoprim and 4800 mg sulfamethoxazole per day.
## Pediatric Dosing
Dosing is typically based on trimethoprim weight-based recommendations: 8-10 mg/kg/day divided into two doses.
* **PCP Prophylaxis**: 5 mg/kg/day of trimethoprim and 25 mg/kg/day of sulfamethoxazole, divided into two daily doses, given on 3 consecutive days per week or daily.
* **PCP Treatment**: 15-20 mg/kg/day of trimethoprim and 75-100 mg/kg/day of sulfamethoxazole, divided into four doses.
* **Other Infections**: Dosing varies by indication and age. Consult specific pediatric guidelines.
## Dose Adjustments
* **Renal Impairment**:
* CrCl > 30 mL/min: No adjustment needed.
* CrCl 15-30 mL/min: Half the usual dose.
* CrCl < 15 mL/min: Contraindicated.
* **Hepatic Impairment**: Use with caution; monitor liver function.
## Contraindications
* Known hypersensitivity to trimethoprim, sulfamethoxazole, or sulfonamides.
* Documented megaloblastic anemia due to folate deficiency.
* Infants < 2 months old (risk of kernicterus).
* Severe renal insufficiency when frequent monitoring of plasma concentrations is impossible.
* Porphyria.
## Adverse Effects
Common: Rash, nausea, vomiting, diarrhea, hyperkalemia.
Serious: Severe skin reactions (Stevens-Johnson syndrome, toxic epidermal necrolysis), blood dyscrasias (anemia, thrombocytopenia, leukopenia), hepatitis, hyperkalemia, renal dysfunction, crystalluria.
## Key Drug Interactions
* **Warfarin**: Increased INR. Monitor INR closely.
* **ACE inhibitors/ARBs/Potassium-sparing diuretics**: Increased risk of hyperkalemia.
* **Methotrexate**: Increased methotrexate toxicity.
* **Potassium supplements**: Increased risk of hyperkalemia.
* **Diuretics (especially thiazides)**: Increased risk of thrombocytopenia in elderly patients.
## Monitoring
* Renal function (BUN, creatinine).
* Electrolytes (especially potassium).
* Complete blood counts (CBC) with differential, particularly with prolonged therapy or in elderly patients.
* Liver function tests.
* Signs of hypersensitivity reactions or rash.
## Clinical Pearls
* Administer with a full glass of water to prevent crystalluria.
* Advise patients to stay well-hydrated.
* Monitor for signs of hypersensitivity, especially in HIV-positive patients and the elderly.
* Folic acid supplementation (1 mg daily) may be considered, particularly for long-term use or in patients at risk for folate deficiency, but may interfere with the efficacy against PCP.
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*This information is a summary and not a substitute for professional medical advice. Always consult the most current prescribing information and clinical guidelines before administering any medication.*
