Management of Cellulitis in Older Adults

First-Line Antibiotic Selection

The American College of Physicians recommends oral antibiotics active against streptococci, including penicillin, amoxicillin, amoxicillin-clavulanate, dicloxacillin, and cephalexin (500 mg four times daily), for non-purulent, uncomplicated cellulitis 1, 2
Clindamycin is also an option for first-line treatment, according to the Infectious Diseases Society of America 3, 1, 2

A 5-day course of antimicrobial therapy is as effective as a 10-day course for uncomplicated cellulitis if clinical improvement has occurred by day 5, as recommended by the Clinical Infectious Diseases society 3, 2
Treatment should be extended if the infection has not improved within the initial 5-day period, according to the Praxis Medical Insights guidelines 1, 2

Elevation of the affected area is particularly important in older adults to promote gravity drainage of edema and inflammatory substances, as suggested by the Clinical Infectious Diseases society 3, 2
Identify and treat predisposing conditions that are common in older adults, such as venous insufficiency 2, tinea pedis or other toe web abnormalities 2, and prior trauma to the area 3, 2

Consider adding MRSA coverage only in specific situations, such as cellulitis associated with penetrating trauma 2, evidence of MRSA infection elsewhere 2, purulent drainage 2, or history of injection drug use 3, 2
Options for MRSA coverage include clindamycin alone 3 or combination of SMX-TMP or doxycycline with a β-lactam 3

Systemic corticosteroids, such as prednisone 40 mg daily for 7 days, could be considered in non-diabetic older adults to reduce inflammation and hasten resolution, as recommended by the Clinical Infectious Diseases society 3, 1, 2

Consider hospitalization for older adults with severe infections with systemic inflammatory response syndrome 1, altered mental status 1, hemodynamic instability 1, concern for deeper or necrotizing infection 1, poor adherence to therapy 2, immunocompromise 2, or failure of outpatient treatment 1, 2

For older adults with frequent episodes of cellulitis, consider prophylactic antibiotics such as oral penicillin 1, erythromycin 1, or intramuscular benzathine penicillin 1
Address underlying conditions that predispose to recurrence, such as treating tinea pedis 2 and managing venous insufficiency and lymphedema 2

Don't extend treatment unnecessarily beyond 5 days if clinical improvement has occurred, as recommended by the Praxis Medical Insights guidelines 2
Don't automatically add MRSA coverage for typical non-purulent cellulitis without specific risk factors, according to the Praxis Medical Insights guidelines 2
Don't forget to examine interdigital toe spaces in lower-extremity cellulitis, as treating fissuring or maceration may reduce recurrence, as suggested by the Praxis Medical Insights guidelines 2
Don't overlook the importance of elevating the affected area, especially in older adults with venous insufficiency or lymphedema, as recommended by the Clinical Infectious Diseases society 3, 2