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# Septran (Co-trimoxazole)
## Overview
Septran is a combination of trimethoprim and sulfamethoxazole, a sulfonamide antibiotic. It is available in various strengths, typically containing 80 mg trimethoprim and 400 mg sulfamethoxazole per tablet or 200 mg trimethoprim and 1000 mg sulfamethoxazole per 5 mL suspension.
## Primary Indications
* Urinary tract infections (UTIs)
* Pneumocystis jirovecii pneumonia (PCP) prophylaxis and treatment
* Shigellosis
* Acute otitis media
* Acute exacerbations of chronic bronchitis
* Traveler's diarrhea
## Adult Dosing
* **Uncomplicated UTIs:** 1 double-strength (DS) tablet (160 mg trimethoprim/800 mg sulfamethoxazole) twice daily for 3 days.
* **PCP Treatment:** 15-20 mg/kg/day trimethoprim component divided into 3-4 doses, given orally or IV, for 14-21 days. Maximum daily dose: 960 mg trimethoprim.
* **PCP Prophylaxis:** 1 DS tablet once daily, or 1 DS tablet three times weekly.
* **Shigellosis:** 1 DS tablet twice daily for 5 days.
* **Traveler's Diarrhea:** 1 DS tablet twice daily for 3-5 days.
## Pediatric Dosing
Dosing is based on the trimethoprim component (10 mg/kg/day) and sulfamethoxazole component (50 mg/kg/day) divided into two daily doses. Maximum daily dose should not exceed the adult dose.
* **General Infections (UTIs, Otitis Media):** 8-10 mg/kg/day trimethoprim and 40-50 mg/kg/day sulfamethoxazole, divided into two doses.
* Example: For a 20 kg child, approximately 1 DS tablet (or 2 regular tablets, or 10 mL suspension) per day, divided into two doses.
* **PCP Treatment:** 15-20 mg/kg/day trimethoprim component divided into 3-4 doses, given orally or IV, for 14-21 days.
* **PCP Prophylaxis:** 5 mg/kg/day trimethoprim and 25 mg/kg/day sulfamethoxazole, divided into two doses once daily. Maximum daily dose: 320 mg trimethoprim.
## Dose Adjustments
* **Renal Impairment:**
* CrCl > 30 mL/min: No adjustment needed.
* CrCl 15-30 mL/min: Administer 75% of the standard dose.
* CrCl < 15 mL/min: Contraindicated.
## Contraindications
* Known hypersensitivity to trimethoprim or sulfamethoxazole.
* Documented hypersensitivity to sulfonamides.
* Megaloblastic anemia due to folate deficiency.
* Infants < 2 months of age (risk of kernicterus).
* Severe renal or hepatic insufficiency when adequate laboratory data is unavailable.
## Adverse Effects
Common: Nausea, vomiting, rash, diarrhea, anorexia.
Serious: Stevens-Johnson syndrome, toxic epidermal necrolysis, hypersensitivity reactions, hyperkalemia, bone marrow suppression (leukopenia, thrombocytopenia, anemia), crystalluria, photosensitivity.
## Key Drug Interactions
* **Warfarin:** Increased INR; requires close monitoring.
* **ACE inhibitors/ARBs:** Increased risk of hyperkalemia.
* **Potassium supplements:** Increased risk of hyperkalemia.
* **Methotrexate:** Increased risk of bone marrow suppression.
* **Cyclosporine:** Increased risk of nephrotoxicity.
* **Diuretics (especially thiazides):** Increased risk of hyperkalemia and hyponatremia.
* **Potassium-sparing diuretics:** Additive hyperkalemic effect.
## Monitoring
* **Renal function:** Particularly in patients with pre-existing renal disease or receiving concurrent nephrotoxic agents.
* **Complete blood counts (CBC):** Baseline and periodically, especially with prolonged therapy or in immunocompromised patients.
* **Electrolytes:** Particularly potassium, especially in patients with renal impairment or on ACE inhibitors/ARBs.
* **Hydration status:** Encourage adequate fluid intake to prevent crystalluria.
* **Signs of hypersensitivity reactions:** Monitor for rash, fever, and other signs of severe cutaneous reactions.
## Clinical Pearls
* Administer with food or milk to minimize gastrointestinal upset.
* Ensure adequate fluid intake (at least 1200-1500 mL/day for adults) to prevent crystalluria.
* Caution in patients with G6PD deficiency due to risk of hemolytic anemia.
* May interfere with urine glucose and bilirubin tests.
* Oral suspension is often flavored for palatability in pediatric patients.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional protocols for definitive guidance. This information does not substitute for professional clinical judgment.*
