Syphilis Treatment in Phuket: How Many Injections and What Stage You Are At

Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: October 2026

You got a positive syphilis result. Maybe it came from a test you asked for after a few weeks back in Patong. Maybe a partner told you. Maybe it showed up on a routine panel at a walk-in clinic here on the island. However it happened, you are now sitting with the result and wondering what comes next.

The treatment part is actually straightforward. What trips most people up is not knowing which stage they are in. That is the number that determines how many injections you need.

Syphilis is a bacterial infection, which means it can be cured. Benzathine penicillin G, given as an injection into the muscle, is the standard treatment everywhere in the world, including here in Phuket. What changes is the injection count. Get the stage right and you get the treatment right.

Getting Tested First

Before any treatment, you need confirmation. A positive syphilis diagnosis uses two blood tests together. The first is an RPR or VDRL, which detects immune activity and gives a titer, a number that reflects how active the infection is. The second is a TPHA or TPPA, which confirms the result is specifically syphilis.

At Takecare Clinic Phuket, both tests run on the same visit. Results are available the same day. If the result is positive and your history fits, we can start treatment before you leave.

One thing to know: the treponemal test, once positive, usually stays positive for life, even after a full cure. That does not mean the infection is still active. The RPR titer is what we use to track whether treatment has worked.

How Many Syphilis Injections Do You Need by Stage

This is the question I get most often, and the answer depends entirely on how long the infection has been in your system.

Primary syphilis presents as a painless ulcer called a chancre, usually on the genitals, mouth, or rectum. It often disappears on its own within a few weeks, which is one reason people miss it.

Secondary syphilis brings a rash, often on the palms and soles, sometimes with flu-like symptoms. This is when the infection is most contagious. Both primary and secondary syphilis are treated with a single injection.

The stage that confuses most patients is latent syphilis, meaning no symptoms at all. The cut-off that matters is one year. If you can confirm from a recent negative test or a known exposure that the infection is under a year old, that is early latent and one injection is enough. If the duration is unknown or over a year, we treat as late latent with three weekly injections.

Neurosyphilis, where the infection has reached the brain or spinal cord, requires intravenous penicillin in a hospital. I refer patients directly when this is suspected.

What to Expect After the Injection

Most patients feel fine afterward. Some do not.

Within four to twelve hours of the first injection, some patients develop what is called a Jarisch-Herxheimer reaction. It feels like a sudden flu: fever, chills, muscle aches, and headache. In patients with secondary syphilis, it is especially common.

This is not an allergic reaction to penicillin. It is your immune system responding to the bacteria being cleared. It almost always resolves within twenty-four hours.

Rest, drink water, and take paracetamol for the fever and aches. If your fever is high, your symptoms feel severe, or something feels wrong, come back to the clinic. Do not wait it out if you are worried.

I tell every patient about this before they leave. If no one warned you about it, that is a gap in your pre-treatment counselling, not a sign something has gone wrong.

If You Are Allergic to Penicillin

For non-pregnant adults with a confirmed penicillin allergy, doxycycline taken orally twice daily is the standard alternative. For early syphilis, that means fourteen days. For late latent or tertiary syphilis, the course extends to twenty-eight days. Missing doses reduces effectiveness.

If you are pregnant and allergic to penicillin, the situation is different. Doxycycline is not safe in pregnancy. Penicillin is the only reliably safe option for both mother and unborn child, and preventing congenital syphilis depends on it. Penicillin desensitisation is possible but requires a hospital setting with monitoring. I refer pregnant patients with penicillin allergy directly.

Partner Treatment and Preventing Re-infection

Getting treated yourself and then returning to an untreated partner means re-infection. It happens more often than people expect, and it is one of the main reasons syphilis comes back after treatment.

The practical reality in Phuket is that partners are not always easy to reach. A partner may already be home in another country, or someone you are not sure how to contact. Do what you can. If a partner is still on the island and willing to come in, Takecare Clinic Phuket can test and treat them on the same walk-in visit, no appointment needed, with full confidentiality.

Avoid sex until both you and your partner have completed treatment and a follow-up test confirms your RPR titer has dropped. One injection does not mean you are clear the next morning.

Follow-Up Testing After Syphilis Treatment in Phuket

The injection is not the last step. Confirming the treatment worked requires follow-up RPR blood tests at three months and six months after your injection.

A successful response is a four-fold fall in RPR titer. If your titer was 1:16 at diagnosis, we want to see it at 1:4 or lower by three months. For early syphilis, many patients reach undetectable levels. For late-stage disease, the titer may fall but not always reach zero, and that can still represent a successful outcome.

If you are an expat in Phuket, follow up here and we can track your titers over time. If you are a tourist heading home before the three-month mark, I will give you documentation with your diagnosis, treatment date, and baseline titer so your doctor at home knows exactly where things stand.

How Syphilis Treatment Works at Takecare Clinic Phuket

The process is straightforward. Walk in with no appointment. A blood draw is taken, the physician reviews results the same day, and if the diagnosis is confirmed, the benzathine penicillin G injection is given before you leave. The whole visit, including a briefing on what to expect after the injection and a follow-up plan, typically takes under two hours.

For STD testing in Phuket, we run both the RPR screening and treponemal confirmation test together. You get both results before any treatment decision is made.

Confidentiality is standard. You do not have to explain anything to a hotel reception or travel companion. You see an English-speaking physician, and you leave with a clear plan. In a resort community this size, that matters more than people expect.

If a recent exposure or new symptoms have appeared in the last few days, come in the same day rather than waiting. You can also review the full range of sexual health services at our clinic before your visit.