Dengue Fever Treatment in Phuket: Fluids, Monitoring and Knowing the Warning Signs
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: September 2026.
“The hardest thing to explain to dengue patients is that the dangerous days often come just as they start to feel better. The fever breaks around day four or five, people want to go back to the beach, and that is exactly when plasma leakage can begin. Most visitors with dengue recover fully as outpatients, but only because someone is checking their blood count every day through that window.” Dr. Ponlawat Pitsuwan
What dengue fever is
Dengue is a viral infection spread by Aedes mosquitoes, which bite mainly in daytime and are common in Phuket throughout the year, especially in the rainy season. Transmission by Aedes mosquitoes runs from an infected person to a mosquito and on to the next person it bites; dengue does not pass directly from person to person. There are four types of dengue virus. Infection with one gives lifelong immunity to that type only, and a second infection with a different type carries a higher risk of severe dengue, because antibodies from the first infection can make the second one worse.
Symptoms usually begin 4 to 10 days after the bite, with a sudden high fever, severe headache, pain behind the eyes, muscle and joint pain, nausea and sometimes a rash. Most people have a relatively mild illness that settles in about a week, although tiredness can last for several weeks more. A small proportion develop severe dengue, in which fluid leaks out of the blood vessels (plasma leakage), leading to life-threatening shock, serious bleeding or organ damage. This was previously called dengue haemorrhagic fever (DHF, spelt dengue hemorrhagic fever in the US), and WHO now groups it under severe dengue. Recognising and treating that early is the purpose of monitoring.
The three phases of dengue, and what we do in each
Dengue follows a fairly predictable course, described in WHO guidance as three phases. Knowing which phase you are in tells us what to watch for.
| Phase | Typical timing | What happens | What we do |
|---|---|---|---|
| Febrile phase | Days 1 to 3, sometimes up to 7 | High fever, headache, aches, poor appetite, nausea | Confirm dengue, baseline blood count, paracetamol, oral fluids plan |
| Critical phase | Around days 3 to 7, as fever falls; lasts about 24 to 48 hours | Possible plasma leakage, falling platelets, rising haematocrit, warning signs | Daily or more frequent blood counts, IV fluids if needed, hospital referral for warning signs |
| Recovery phase | After the critical phase, over 2 to 3 days | Appetite returns, platelets rise, itchy rash may appear, fatigue persists | Final blood check, advice on returning to activity and flying |
How we treat dengue at Takecare
Confirming the diagnosis
If you have not been tested yet, we start with a dengue test in Phuket: a rapid NS1 antigen test in the first five days of fever, or IgM and IgG antibody tests later, together with a complete blood count. That first blood count becomes the baseline we compare against every day afterwards. You can read more about what each value means on our page on blood tests in Phuket.
Fluids: the core of treatment
Staying well hydrated is the most important thing you can do. Most people can manage with oral fluids: oral rehydration solution, water, clear soups, coconut water and fruit juice, taken steadily through the day. A useful guide is passing urine at least every 4 to 6 hours. If you are vomiting, cannot drink enough or are showing early signs of dehydration, we can give intravenous fluids in the clinic, and our page on IV drip therapy in Phuket explains how that works. Fluid management in dengue must be carefully judged, because too much can also be harmful during plasma leakage, which is one reason severe cases are managed in hospital.
Fever and pain: paracetamol only
Paracetamol is the only recommended medicine for fever and aches in dengue. Take it at the normal dose and never more than the maximum daily dose on the label; the doctor may advise a lower daily limit if your liver tests are raised, since dengue can inflame the liver. Do not take ibuprofen, aspirin, diclofenac, naproxen or other non-steroidal anti-inflammatory drugs (NSAIDs), because they affect platelet function and irritate the stomach lining, which increases the risk of bleeding. Tepid sponging and rest also help. We also avoid injections into the muscle, which can cause bruising when platelets are low.
Daily monitoring
Through the critical days we repeat your blood count, usually daily, and more often if needed. We look at the platelet count, the white cell count and especially the haematocrit, the proportion of blood made of red cells, which rises when plasma leaks out of the vessels. We also check your blood pressure, pulse, hydration, abdomen and any bleeding. You leave each visit with clear instructions on what to watch for before the next check.
Hospital admission: when outpatient care is not enough
Most dengue patients can be safely monitored as outpatients, but some need hospital care, and we arrange the referral immediately when they do. Based on WHO criteria, admission is advised for anyone with a warning sign: severe or persistent abdominal pain or tenderness, persistent vomiting, fluid build-up in the abdomen or around the lungs, bleeding from the gums, nosebleeds or bleeding from the gut, lethargy or restlessness, an enlarged liver, or a rising haematocrit with a rapidly falling platelet count. Anyone with signs of severe dengue, such as shock, severe bleeding or organ impairment, needs emergency hospital care.
We also have a lower threshold for admission in pregnancy, in infants and older adults, and in people with diabetes, obesity, high blood pressure, heart or kidney disease or blood disorders. Social factors count too: if you are travelling alone, cannot get to a clinic for daily checks, or are staying far from a hospital, hospital monitoring may be the safest choice during the critical phase.
When to see a doctor
If you have a fever in Phuket, see a doctor within the first day or two so dengue can be confirmed or ruled out; our fever treatment page covers the other causes we check. If dengue has been diagnosed, come back for every scheduled blood check even if you feel better.
Go to a hospital emergency department immediately, or call 1669, if you develop severe abdominal pain, keep vomiting, bleed from the gums or nose, vomit blood or pass black stools, become very drowsy, restless or confused, have cold clammy hands and feet, feel faint, have difficulty breathing, or pass very little urine. These can appear as the fever is falling, so a normal temperature does not mean you are safe.
Prevention and early detection
Preventing further bites protects you and the people around you, because a mosquito that bites you during the febrile phase can pass dengue on to others. Use a repellent containing DEET, picaridin or IR3535, sleep under a net or in air conditioning while you have a fever, and remove standing water from plant pots, buckets and containers around your accommodation. Mosquitoes that carry dengue bite mainly in the day, especially early morning and late afternoon.
Because a second dengue infection carries a higher risk of severe disease, anyone who has had dengue should be especially careful about bites and should get tested early with any future fever. Dengue vaccines are available in some countries; whether one is suitable depends on your age and whether you have had dengue before, so ask a doctor after you have recovered.
Visiting Takecare Clinic in Phuket
Dengue care, including daily blood counts, is available 24/7 without an appointment at our Cherngtalay clinic near Bangtao Beach, our clinic serving Kata and Karon, and our Patong clinic. If you are too weak to travel, a doctor hotel visit in Phuket can include the examination, blood sample and advice in your room.
To plan your daily checks, contact us on WhatsApp or call 081-718-9080. We confirm the price before your visit, offer direct billing with most travel insurers, and provide medical reports, itemised invoices and fit-to-fly advice for your insurer or airline.
Related services and treatments
For any other health problem during your recovery, such as a stomach upset or a skin rash, a walk-in doctor in Phuket is available at every branch around the clock.
Summary
Dengue has no specific antiviral, but good supportive care works: confirm the diagnosis, drink plenty, use paracetamol only, and check your blood count daily through the critical phase around days 3 to 7, when the fever falls. Warning signs such as abdominal pain, persistent vomiting, bleeding or drowsiness mean hospital care, which we arrange immediately. Most people recover fully in about a week, with tiredness that can linger. Takecare Clinic Phuket provides this care 24/7 at three branches and in your hotel.
“When your fever breaks, do not celebrate by skipping your blood test. Come in that day. The next 48 hours are when dengue decides whether it will be a bad week or a dangerous one.” Dr. Ponlawat Pitsuwan
Frequently asked questions
How long does dengue fever last?
The fever usually lasts 2 to 7 days, followed by a critical phase of about 24 to 48 hours as it falls, and then recovery over a few days. Most people feel ill for about a week. Tiredness and low mood can last for several weeks afterwards, so plan a gentle return to activity.
Can dengue be treated at home or in my hotel?
Yes, most people are monitored as outpatients if they can drink enough, have no warning signs and can have daily blood checks. A doctor can visit your hotel or villa for examination and blood tests. If warning signs appear, if you are pregnant or have other conditions, or if you are travelling alone, hospital care may be safer.
What painkillers can I take for dengue?
Only paracetamol, at the normal dose and never above the label maximum. Avoid ibuprofen, aspirin, diclofenac, naproxen and other anti-inflammatory painkillers, because they increase the risk of bleeding. Check combination cold and flu products too, as some contain these medicines. Ask a doctor before taking anything else.
When do I need to go to hospital with dengue?
Go to hospital for any warning sign: severe abdominal pain, persistent vomiting, bleeding from the gums or nose, black stools, drowsiness or restlessness, cold clammy skin or very little urine. A rising haematocrit with a rapidly falling platelet count on your blood test is also a reason for admission, and we arrange referral immediately.
Can I fly after having dengue?
Once your fever has settled, you are through the critical phase, you feel well and your blood count is recovering, most people can fly. Flying during the critical phase is not advised, because warning signs could appear in the air. We can check your blood count before departure and give a fit-to-fly letter if your airline or insurer needs one.
Will travel insurance cover dengue treatment?
Most travel insurance policies cover dengue treatment, including consultations, daily blood tests, IV fluids and hospital care, because it is an illness that starts during your trip. We offer direct billing with most travel insurers and provide medical reports and itemised invoices. Message us your insurer’s name on WhatsApp and we will confirm before your visit.
Sources
WHO: Dengue and severe dengue. NHS: Dengue. MedlinePlus: Dengue.
Dengue fever, dengue treatment, severe dengue, dengue haemorrhagic fever, dengue shock syndrome, dengue virus serotypes, Aedes aegypti, febrile phase, critical phase, recovery phase, plasma leakage, haematocrit, platelet count, thrombocytopenia, NS1 antigen, IgM, IgG, oral rehydration solution, intravenous fluids, paracetamol, NSAIDs, ibuprofen, aspirin, dengue warning signs, hospital admission, fit to fly, dengue vaccine, WHO, NHS, MedlinePlus, Bangtao, Cherngtalay, Kata, Karon, Patong, Phuket, Dr. Ponlawat Pitsuwan, Takecare Clinic Phuket.
This page is general health information and not a substitute for a medical consultation.