Does Prednisone Increase Infection Risk?
Yes, prednisone, a corticosteroid, increases infection risk by suppressing the immune system. It inhibits white blood cell activity, reduces inflammation responses, and impairs the body's ability to fight bacteria, viruses, fungi, and other pathogens. This effect is dose- and duration-dependent: higher doses (e.g., over 20 mg/day) and longer use (weeks to months) heighten vulnerability more than short-term low-dose therapy.[1][2]
How Does Prednisone Suppress Immunity?
Prednisone mimics cortisol, blocking cytokine production and T-cell function while promoting neutrophil apoptosis. This dampens innate and adaptive immunity, making opportunistic infections like Pneumocystis jirovecii pneumonia or herpes zoster more common, especially in patients with underlying conditions such as rheumatoid arthritis or COPD.[1][3]
What Types of Infections Are Most Common?
Patients on prednisone face elevated risks for:
- Bacterial: Skin infections, pneumonia, urinary tract infections.
- Viral: Reactivation of shingles, CMV.
- Fungal: Oral thrush, candidiasis.
- Other: Tuberculosis reactivation in at-risk groups.
Meta-analyses show 2-3 times higher infection rates versus non-users, with severe cases rising up to 5-fold at high doses.[2][4]
How Long Does the Risk Last?
Risk peaks during active treatment and persists 1-3 months after stopping, depending on cumulative dose. Short courses (under 2 weeks) carry minimal added risk for healthy adults, but chronic use requires monitoring.[1][3]
Who Is at Highest Risk?
- Elderly patients.
- Those on high doses (>10-20 mg/day) or combined with other immunosuppressants (e.g., methotrexate).
- People with diabetes, lung disease, or prior infections.
Guidelines recommend Pneumocystis prophylaxis for prednisone ≥20 mg/day for >1 month.[3][5]
How Do Doctors Manage This Risk?
Strategies include:
- Lowest effective dose for shortest time.
- Vaccinations (e.g., pneumococcal, influenza) before starting.
- Prophylactic antibiotics or antifungals in high-risk cases.
- Prompt infection screening for symptoms like fever or cough.
Abrupt stopping can cause adrenal crisis, so taper under supervision.[1][5]
Can You Take Prednisone Safely During Active Infections?
Avoid starting prednisone during acute infections unless benefits outweigh risks (e.g., severe asthma exacerbation). It can worsen or prolong infections; consult a doctor for alternatives like localized steroids.[2][4]
[1]: UpToDate - "Major side effects of systemic glucocorticoids" (uptodate.com/contents/major-side-effects-of-systemic-glucocorticoids)
[2]: NEJM - "Glucocorticoids and Risk of Infection" (nejm.org/doi/full/10.1056/NEJMra1900241)
[3]: CDC - "Guidelines for Prevention of Opportunistic Infections in Adults" (cdc.gov/mmwr/volumes/67/rr/rr6704a1.htm)
[4]: Lancet - "Corticosteroid use and infections" (thelancet.com/journals/laninf/article/PIIS1473-3099(18)30281-0/fulltext)
[5]: American College of Rheumatology - "Management of Glucocorticoid Therapy" (rheumatology.org/Portals/0/Files/Glucocorticoid-Induced-Osteoporosis-Guidelines.pdf)