White Penile Discharge with Burning: Urethritis Until Proven Otherwise
This presentation is urethritis—most commonly caused by Chlamydia trachomatis or Neisseria gonorrhoeae—and requires immediate empiric treatment with azithromycin 1 g orally as a single dose PLUS ceftriaxone or cefixime to cover both pathogens. 1, 2
Diagnostic Approach
The combination of white discharge and burning is classic for urethritis. You need objective evidence of urethral inflammation through at least one of these criteria 1:
- Visible urethral discharge (you already have this)
- Positive leukocyte esterase test on first-void urine
- ≥10 white blood cells per high-power field in first-void urine sediment
Key diagnostic step: Gram stain of the discharge can immediately distinguish gonococcal (gram-negative intracellular diplococci present) from non-gonococcal urethritis, but don't wait for this if unavailable—treat empirically 1.
Primary Pathogens
The two main culprits are 2:
- Chlamydia trachomatis (most common cause of non-gonococcal urethritis)
- Neisseria gonorrhoeae (causes gonococcal urethritis)
Less common organisms include Mycoplasma genitalium (responds better to azithromycin than doxycycline), Ureaplasma species, Trichomonas, and rarely herpes simplex virus 2.
Immediate Treatment Regimen
First-line empiric therapy (treat for both gonorrhea and chlamydia simultaneously) 1:
For Chlamydia:
- Azithromycin 1 g orally single dose (preferred for compliance and M. genitalium coverage)
- OR Doxycycline 100 mg orally twice daily for 7 days
PLUS coverage for gonorrhea:
- Ceftriaxone (typically 250-500 mg IM single dose)
- OR Cefixime (typically 400 mg orally single dose)
Critical point: Dispense medications on-site and directly observe the first dose to maximize compliance 1.
Testing Requirements
While treating empirically, obtain 1:
- Nucleic acid amplification tests (NAATs) for both N. gonorrhoeae and C. trachomatis
- HIV and syphilis testing (all patients with new STD diagnosis)
- First-void urine for urinalysis if discharge not visible
Behavioral Instructions
Abstinence requirements 1:
- No sexual intercourse for 7 days after single-dose therapy
- Continue abstinence until completion of 7-day regimens AND symptoms resolve
- No intercourse until all sexual partners are treated
Partner Management
Expedited partner treatment is recommended: Give the patient prescriptions for partners who haven't been examined, as this approach is endorsed by the CDC and approved in many states 2. All partners need evaluation and treatment.
Red Flags and Alternative Diagnoses
While urethritis is the overwhelming likelihood, rare presentations to consider if the clinical picture doesn't fit:
- Prostatic abscess: Especially in older men (>60 years) with no fever or dysuria—requires imaging if suspected 3
- Perirectal abscess: If scrotal pain/swelling present—perform digital rectal exam looking for fluctuant mass 4
- Balanitis: If inflammation involves the glans/foreskin rather than urethral discharge 5
Follow-Up
Instruct the patient to return if symptoms persist or recur after completing therapy. Persistent symptoms may indicate treatment failure, reinfection, or infection with resistant organisms like M. genitalium 1.
Important caveat: The association between urethritis and increased HIV concentration in semen underscores the importance of HIV testing and partner notification 2.