Syphilis Treatment in Patong, Phuket: Same-Day Penicillin Injection and Confidential STI Care

Discreet syphilis testing by treponemal and non-treponemal serology, same-day intramuscular benzathine penicillin for primary, secondary and early latent disease, structured partner notification and a clear 3, 6 and 12 month retest plan. Walk-in clinic or private hotel-room visit, day and night. Clinically reviewed by the Doctor Patong Takecare Clinic medical team.

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Syphilis cases are climbing again worldwide, including across Thailand, and we see a steady mix of presentations in Patong: a painless genital ulcer noticed in the shower, a strange rash on the palms a few weeks after a holiday encounter, a positive contact tracing message from a previous partner, or simply a patient who wants a full STI baseline before flying home. Our job is to confirm the stage with paired serology, deliver the right penicillin regimen the same hour where appropriate, screen for HIV and the other common co-infections, manage partner notification in plain English and book the 3, 6 and 12 month follow-up titres that prove the infection is gone. Everything happens inside a private consulting room, and results are sent only by WhatsApp.

Stages of syphilis and why they matter

Syphilis is unusual among bacterial infections because it unfolds in distinct stages, each with its own pattern, infectivity and treatment length. Primary syphilis appears 9 to 90 days after exposure, typically around three weeks, as a single painless ulcer (the chancre) at the site of inoculation, which can be genital, anal or oral. Because the chancre does not hurt, it is often missed, especially when it sits inside the vagina, rectum or mouth, and it heals on its own in three to six weeks even without treatment, leaving the infection in place. Secondary syphilis follows four to ten weeks later as a body-wide symmetric maculopapular rash that classically includes the palms and soles, alongside generalised lymph-node swelling, moist broad papules in warm areas (condyloma lata), oral and genital mucous patches, patchy hair loss, low-grade fever and malaise. This stage is highly infectious. Without treatment the infection then enters a latent phase, divided into early latent (within one year of infection, still infectious) and late latent (more than a year, much less infectious but still present). A minority of untreated patients progress, years later, to tertiary syphilis, with gummatous lesions in skin and bone, cardiovascular syphilis (aortitis and aortic aneurysm) or neurosyphilis (general paresis, tabes dorsalis, meningovascular disease). Neurosyphilis, ocular syphilis (uveitis) and otosyphilis (sudden hearing loss) can occur at any stage and are treated as emergencies. Congenital syphilis, passed from mother to baby in pregnancy, is preventable by antenatal screening and treatment, which is why every pregnancy in Thailand is tested at booking.

Diagnosis: paired serology, sometimes a lumbar puncture

Syphilis is diagnosed by a paired blood test, because no single test answers every question. A treponemal test (TPPA, FTA-ABS, EIA or CMIA) detects antibodies specific to Treponema pallidum, turns positive within a few weeks of infection and stays positive for life, even after successful treatment. A non-treponemal test (RPR or VDRL) is reported as a quantitative titre such as 1:8 or 1:32, falls predictably with successful treatment and is used to monitor cure. We run both at every diagnostic visit: a reactive treponemal test confirms exposure, and the non-treponemal titre sets the baseline. Where a chancre is visible, dark-field microscopy or PCR of lesion fluid can give an instant diagnosis, though serology remains the day-to-day standard. Patients with neurological symptoms, eye or hearing involvement, or HIV co-infection with an RPR of 1:32 or higher are referred for a lumbar puncture to examine cerebrospinal fluid, because neurosyphilis changes the treatment plan completely. Every new syphilis diagnosis is paired with same-visit screening for HIV, hepatitis B and C, chlamydia and gonorrhoea, and a pregnancy test in women. Our companion pages on the broader STD test panel and the more detailed lab-based STI workup cover the wider screen.

Treatment: penicillin, allergy options and the Jarisch-Herxheimer reaction

The first-line treatment for primary, secondary and early latent syphilis is a single intramuscular injection of benzathine penicillin G 2.4 million units, given as one large dose split between both buttocks. For late latent syphilis, syphilis of unknown duration and tertiary disease without neurological involvement, the same dose is given once a week for three consecutive weeks. Neurosyphilis, ocular syphilis and otosyphilis are treated with intravenous aqueous crystalline penicillin G 18 to 24 million units per day for 10 to 14 days, which means hospital admission and a referral that we arrange the same day. For patients with a documented penicillin allergy outside pregnancy, doxycycline 100 mg twice daily for 14 days covers primary, secondary and early latent disease, with 28 days used for late latent infection. Ceftriaxone 1 to 2 g intramuscular or intravenous daily for 10 to 14 days is the alternative where doxycycline is not suitable. In pregnancy the rule is absolute: only penicillin reliably protects the foetus, so penicillin-allergic pregnant patients are desensitised in hospital and then treated with penicillin, not substituted. A predictable side effect of the first injection in early syphilis is the Jarisch-Herxheimer reaction, a self-limited flu-like episode of fever, chills, headache, muscle ache and a transient flare of the rash, starting 4 to 12 hours after the dose and settling within 24 hours. It is a sign of treatment working, not an allergic reaction, and we manage it with paracetamol, fluids and a clear warning before you leave the clinic.

Follow-up, partner notification and pregnancy

Cure is confirmed by the falling non-treponemal titre, not by symptoms, so every treated patient returns for a repeat RPR or VDRL at 3, 6 and 12 months. A successful course produces a four-fold drop in titre within 6 to 12 months, for example 1:32 falling to 1:8 or lower. A static or rising titre means either treatment failure or a new infection, and we re-evaluate, often with a lumbar puncture, before re-treating. The treponemal test stays positive for life and is not used for monitoring. Partner notification covers everyone exposed during the infectious window: contacts from the previous 3 months for primary syphilis, 6 months for secondary, and 12 months for early latent. All contacts are offered penicillin treatment empirically even before their own serology is back, because they are likely to be in the early window where the test cannot yet detect infection. We can draft a neutral notification message you can forward by WhatsApp, or contact partners anonymously on your behalf. In pregnancy, untreated syphilis carries roughly a 40 percent risk of stillbirth or neonatal death, with survivors at risk of congenital syphilis (Hutchinson teeth, saddle nose, deafness, neurosyphilis), so screening and treatment are non-negotiable, and we coordinate care with the obstetric team. HIV co-infection raises the risk of neurosyphilis and changes follow-up intervals, and our companion article on HIV PEP and PrEP in Patong covers that side of the conversation, including emerging evidence for doxy-PEP as syphilis prophylaxis. For other bacterial STIs that often turn up alongside, see our pages on chlamydia treatment and the wider STD test panel.

When to see a doctor

Test as soon as you have noticed a new painless genital, anal or oral ulcer, a body-wide rash that includes the palms and soles, patchy hair loss, mucous patches in the mouth, a positive contact tracing message, or any new or anonymous partner where you would like a clean baseline before flying home. Routine STI screening including syphilis is sensible at every change of partner, and at least every three to six months on HIV pre-exposure prophylaxis (PrEP) or with multiple partners.

Prevention and early self-care

Consistent condom use during vaginal, anal and oral sex reduces but does not completely remove the risk of syphilis, because the chancre can sit outside the area a condom covers. Regular screening is the second pillar, particularly at every new partner and at least every three to six months on PrEP or with multiple partners. HIV pre-exposure prophylaxis protects against HIV but not syphilis, so PrEP users are screened more often, not less. Emerging evidence supports doxy-PEP, a single 200 mg dose of doxycycline taken within 72 hours of unprotected sex, which lowers the rate of syphilis and chlamydia in men who have sex with men: we discuss eligibility on a case-by-case basis. After a positive result, the most important self-care steps are accepting the penicillin injection, abstaining from all sex until any ulcer or rash has fully healed and your partners have been treated, and returning for the 3, 6 and 12 month titre checks that confirm cure.

Summary

Syphilis is common, often silent, easily mistaken for other conditions and curable the same day in early disease with a single intramuscular benzathine penicillin injection. Paired treponemal and non-treponemal blood tests confirm the diagnosis and stage, partner notification protects you from immediate re-infection, and a falling RPR or VDRL titre at 3, 6 and 12 months proves cure. Untreated syphilis carries serious long-term cost, particularly cardiovascular and neurological disease, plus a high risk of stillbirth in pregnancy, so the case for a five-minute test is strong even when you feel completely well.

“Most early syphilis patients in Patong walk in with a painless ulcer, an odd rash on the palms, or a contact tracing message, and leave the same hour with a single penicillin injection and a clear retest schedule. The clinical work is short. The longer conversation is always about the stages, the Jarisch-Herxheimer reaction we expect that evening, partner notification, and why the titre at 6 months, not the symptoms, is what tells us the infection is gone.”

Doctor Patong Takecare Clinic medical team

Frequently asked questions

Is a single penicillin injection really enough to cure syphilis?

For primary, secondary and early latent syphilis, yes. A single intramuscular dose of benzathine penicillin G 2.4 million units is the current CDC, BASHH and WHO first-line, and cures the great majority of cases when given before the infection has been present for a year. Late latent syphilis, syphilis of unknown duration and tertiary disease need three weekly injections instead, and neurosyphilis, ocular or otosyphilis need 10 to 14 days of intravenous penicillin in hospital. Stage drives dose, which is why we test paired serology before treating.

What is the Jarisch-Herxheimer reaction and should I worry?

The Jarisch-Herxheimer reaction is a self-limited flu-like episode of fever, chills, headache, muscle ache and sometimes a transient flare of the rash, starting 4 to 12 hours after the first penicillin injection in early syphilis. It is caused by the rapid breakdown of spirochetes, not by an allergy to penicillin, and it settles within 24 hours with paracetamol, fluids and rest. We warn every early syphilis patient before they leave the clinic so the episode is not mistaken for a drug allergy or a separate illness.

Do my partners need treatment even if their syphilis test is negative?

Yes. Contacts from the previous 3 months for primary syphilis, 6 months for secondary and 12 months for early latent are offered penicillin treatment empirically, even if their initial serology is negative. They are likely to be in the early window where antibodies have not yet formed, and a single missed partner is the most common reason for a positive RPR a few months later. We can draft a neutral notification message you can forward, or contact partners anonymously on your behalf.

I am pregnant and tested positive for syphilis. Is treatment safe?

Penicillin in pregnancy is not just safe, it is the only treatment that reliably crosses the placenta and protects the baby from congenital syphilis. Untreated maternal syphilis carries roughly a 40 percent risk of stillbirth or neonatal death, with survivors at risk of permanent damage, so treatment is urgent. Pregnant patients with a true penicillin allergy are admitted to hospital for desensitisation and then treated with penicillin, not substituted with doxycycline, which is unsafe in pregnancy. We coordinate care with the obstetric team and arrange neonatal follow-up.

How do I know the syphilis treatment has worked?

Cure is confirmed by the falling non-treponemal titre (RPR or VDRL), not by symptoms. A successful course produces a four-fold drop in titre within 6 to 12 months, for example 1:32 falling to 1:8 or lower. We repeat the titre at 3, 6 and 12 months after treatment. The treponemal test (TPPA or CMIA) stays positive for life and is not used for monitoring. A static or rising titre suggests treatment failure or new infection, and we re-evaluate, often with a lumbar puncture, before re-treating.

Can I take doxycycline after sex to prevent syphilis?

Doxy-PEP, a single 200 mg dose of doxycycline taken within 72 hours of unprotected sex, lowers the rate of syphilis and chlamydia in men who have sex with men in recent trials and is being adopted by CDC and several European bodies for selected high-risk groups. It does not protect against HIV, so it is used alongside, not instead of, PrEP and condoms, and it is not currently recommended as a routine intervention for everyone. We discuss eligibility on a case-by-case basis at the same visit as HIV PEP and PrEP.

Sources

Centers for Disease Control and Prevention. Sexually Transmitted Infections Treatment Guidelines, 2021: Syphilis. cdc.gov/std/treatment-guidelines/syphilis.
British Association for Sexual Health and HIV (BASHH). UK national guideline on the management of syphilis. bashh.org/guidelines.
World Health Organization. Sexually transmitted infections (STIs) fact sheet. who.int/sti.

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