Syphilis: The correct way we’ve deal with.

Last updated: May 18, 2026

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Many syphilis-positive patients come to see me at my Urology office — some are naïve cases while others are treatment-failure cases from other clinics. This topic will explain how we correctly manage syphilis infection and how to confirm successful treatment.

• Urology center Bangkok hospital Thailand Booking online 02-310-3009 bhquro@bdms.co.th
• Samitivej Sriracha hospital Chonburi 088-022-1445

CDC 2015 Syphilis treatment recommendation

• Treatment regimens
  • Benzathine Penicillin G intramuscular injection — FIRST-LINE regimen
  • Oral Doxycycline or Tetracycline — ALTERNATIVE regimens for penicillin-allergic patients
• Patient education
  • Avoid all sexual contact (including oral sex) until treatment is complete and all symptoms have resolved
  • Wait at least 7 days after completing treatment and until all lesions are fully healed before resuming sexual activity
  • Sexual partners must seek medical evaluation and confirm syphilis-free status before resuming contact
  • Be aware of the Jarisch-Herxheimer Reaction: a fever, rash, malaise, myalgia, nausea, and headache occurring within 24 hours of the first treatment dose. This reaction is caused by endotoxins released from dying syphilis bacteria and resolves safely within 24 hours — it is not an allergic reaction
  • Co-testing for HIV, Gonorrhea, and Chlamydia is strongly recommended in all syphilis cases

• Follow-up plan
  • VDRL blood test is used to monitor treatment success
  • A 4-fold decline in VDRL titer is considered a marker of successful treatment
  • VDRL typically turns negative 6–12 months after successful syphilis treatment

Any questions, you can discuss with your trusted urologist.

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Frequently Asked Questions About Syphilis Treatment

What is the first-line treatment for syphilis?

The first-line treatment for syphilis per CDC guidelines is Benzathine Penicillin G administered as an intramuscular injection. The dose and number of injections depend on the stage of infection — early syphilis (primary, secondary, or early latent) requires a single injection, while late latent or tertiary syphilis requires 3 weekly injections. For patients allergic to penicillin, oral Doxycycline or Tetracycline are the recommended alternatives.

What is the Jarisch-Herxheimer reaction in syphilis treatment?

The Jarisch-Herxheimer reaction is a systemic inflammatory response that occurs within 24 hours of the first syphilis treatment dose. It is caused by endotoxins released from dying Treponema pallidum bacteria and presents with fever, generalized rash, malaise, myalgia, nausea, vomiting, and headache. The reaction is not an allergic response to penicillin and resolves safely within 24 hours without requiring cessation of treatment. Patients should be warned to expect this reaction.

How do we know syphilis treatment was successful?

Treatment success is monitored using serial VDRL blood tests. A 4-fold decline in VDRL titer (e.g., from 1:32 to 1:8) indicates successful treatment response. The VDRL typically becomes negative within 6–12 months after completing treatment for early syphilis. Persistent or rising titers may indicate treatment failure or re-infection, requiring clinical re-evaluation and repeat treatment.

If you have been diagnosed with syphilis or have concerns about a sexually transmitted infection, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. Book a Consultation.

Disclaimer: This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any medical treatment.