Bactrim DS Treatment for Folliculitis

Dosing Guidelines

The standard adult dosage of Bactrim DS for skin and soft tissue infections, including folliculitis, is 1-2 double-strength tablets (800mg/160mg) twice daily, as recommended by the Infectious Diseases Society of America 1, 2
For pediatric patients, the dosage is 8-12 mg/kg/day (based on trimethoprim component) in either 4 divided doses IV or 2 divided doses orally, according to the American Academy of Pediatrics 2
The duration of therapy is typically 7-10 days, depending on clinical response, as suggested by the Infectious Diseases Society of America 2, 3

Trimethoprim-sulfamethoxazole (TMP-SMX) is effective against community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA), a common cause of folliculitis, as stated by the Centers for Disease Control and Prevention 1
TMP-SMX has good activity against aerobes, including Staphylococcus, but relatively poor activity against anaerobes, according to the American Society for Microbiology 4
For severe or extensive folliculitis, inpatient management and possibly IV antibiotics should be considered, as recommended by the Infectious Diseases Society of America 1

For patients with renal impairment, dose adjustment is necessary: creatinine clearance 15-30 mL/min requires a 50% dose reduction, and creatinine clearance <15 mL/min is not recommended, as advised by the National Kidney Foundation 5
TMP-SMX is pregnancy category C/D and not recommended for women in the third trimester of pregnancy, according to the American College of Obstetricians and Gynecologists 1
TMP-SMX is not recommended for children under 2 months of age, as stated by the American Academy of Pediatrics 1

Common side effects of TMP-SMX include gastrointestinal disturbances, rash, and photosensitivity, as reported by the FDA 1
Rare but serious adverse reactions include Stevens-Johnson syndrome, toxic epidermal necrolysis, and bone marrow suppression, which should be monitored, as recommended by the FDA 1
Regular monitoring of complete blood count is recommended for prolonged therapy, as advised by the American Society of Hematology 1

Alternative options for patients who cannot tolerate TMP-SMX or in cases of resistance include clindamycin (300-450 mg orally three times daily), doxycycline (100 mg twice daily), minocycline (200 mg initially, then 100 mg twice daily), and linezolid (600 mg twice daily), as suggested by the Infectious Diseases Society of America 1, 2

Incision and drainage should be performed for any follicular abscess formation, as recommended by the American Academy of Dermatology 2, 3
For recurrent folliculitis, a 5-10 day course of an antibiotic active against the identified pathogen should be considered, as advised by the Infectious Diseases Society of America 2
TMP-SMX can be used concurrently with methotrexate in patients with normal renal function, as stated by the American College of Rheumatology 6

Clinical improvement should be evident within 48-72 hours of starting appropriate therapy, as expected by the Infectious Diseases Society of America 2
If no improvement is seen after 72 hours, alternative diagnoses, resistant organisms, or need for drainage procedure should be considered, as recommended by the American Academy of Dermatology 2
For recurrent folliculitis, decolonization regimens including intranasal mupirocin and chlorhexidine washes should be considered, as suggested by the Infectious Diseases Society of America 2