No, magnesium sulfate should not be used to treat cellulitis
Magnesium sulfate has no role in the treatment of cellulitis. The standard treatment for cellulitis is antimicrobial therapy directed against streptococci, not magnesium sulfate.
Evidence-Based Treatment for Cellulitis
According to the Infectious Diseases Society of America (IDSA) 2014 guidelines, therapy for typical cases of cellulitis should include an antibiotic active against streptococci 1. The primary treatment options include:
Oral Antibiotics (for most patients):
- Penicillin
- Amoxicillin
- Amoxicillin-clavulanate
- Dicloxacillin
- Cephalexin
- Clindamycin
A 5-day course of antimicrobial therapy is as effective as a 10-day course if clinical improvement has occurred by 5 days 1.
Key Treatment Principles:
The primary treatment of cellulitis is antimicrobial therapy, not adjunctive agents like magnesium sulfate 1. The IDSA guidelines make a clear distinction: cellulitis requires antibiotics, whereas purulent collections require drainage.
What Magnesium Sulfate Actually Treats
The FDA-approved indications for magnesium sulfate are 2:
- Magnesium deficiency
- Pre-eclampsia/eclampsia (seizure control)
- Hyperalimentation supplementation
- Specific conditions like barium poisoning
Cellulitis is not an FDA-approved indication for magnesium sulfate.
Adjunctive Measures for Cellulitis
The IDSA guidelines recommend 1:
- Elevation of the affected area to promote gravity drainage of edema
- Treatment of predisposing conditions (tinea pedis, trauma, venous eczema)
- Systemic corticosteroids (prednisone 40 mg daily for 7 days) could be considered in nondiabetic adult patients as an anti-inflammatory adjunct (weak recommendation)
Common Pitfall
Do not confuse the anti-inflammatory properties of magnesium sulfate studied in obstetrical contexts 3, 4 with any indication for skin and soft tissue infections. While research shows magnesium sulfate can modulate inflammatory cytokines in fetal membranes and neonatal cells, this has no relevance to bacterial cellulitis treatment.
The cornerstone of cellulitis management remains appropriate antibiotic therapy targeting streptococci, with β-lactam antibiotics being first-line for typical cases 1, 5.