Guide · Tranexamic acid
Tranexamic acid for melasma serums, tablets and injections, and who should avoid them
Tranexamic acid has moved from treating bleeding to treating melasma. Here is what each form can do, how strong the evidence is, the clot risk a doctor screens for, and how it fits with sunscreen, azelaic acid and laser under Singapore's sun.
Quick answer
- Tranexamic acid (TXA) is a medicine used to reduce bleeding that also dampens the signals driving melasma pigment, so it is used as a serum or cream, as tablets, and as tiny injections into the skin. Oral TXA is the most studied form: in a Singapore study of 561 patients, about nine in ten improved, though around a quarter of those relapsed after stopping.
- Topical serums are gentle and low-risk but work slowly; oral TXA works fastest and is taken only on a doctor's prescription after screening; intradermal microinjections sit in between. A network meta-analysis found oral TXA acted soonest, while over longer follow-up the route mattered less.
- Oral TXA is not for people with a history of blood clots, stroke or a clotting disorder, and needs extra caution with the combined contraceptive pill, smoking, kidney problems or pregnancy. It does not stop melasma for good: it often returns, so daily broad-spectrum sunscreen remains the foundation.
- TXA is often combined with sunscreen, azelaic acid or other prescription creams, and with gentle laser. At IN Eternity Clinic, Pacific Plaza, Dr Sin Yong diagnoses melasma and prescribes tranexamic acid when suitable, priced at consultation; SkinRev Lab does not prescribe or inject.
The basics
What tranexamic acid is, and why it helps melasma
Tranexamic acid is an antifibrinolytic: it slows the breakdown of blood clots, and in Singapore its main medical use is to reduce heavy menstrual bleeding and bleeding in clotting disorders. In the skin, the same pathway (plasmin) is involved in the chain of signals that UV light sets off to stimulate pigment cells and new blood vessels.
By interrupting that pathway, TXA is thought to reduce pigment production and the background redness and small vessels seen in many melasma patches, although the exact mechanism is not fully understood. Using it for melasma is off-label: its licensed uses are for bleeding, and doctors use it for skin under their own clinical judgement.
Melasma itself is a chronic, relapsing condition driven by UV, visible light, heat and hormones. TXA can lighten it, but whichever form is used, melasma tends to return, which is why sun protection and maintenance matter as much as the medicine.
Side by side
Topical vs oral vs intradermal tranexamic acid
A 2024 network meta-analysis comparing routes found oral TXA improved melasma scores sooner than topical, injected or microneedled TXA, and that oral TXA combined with standard topical treatment gave the largest improvement overall. Over longer follow-up, the difference between routes of TXA used on its own narrowed. Most trials were small and short, so these are patterns rather than firm rankings.
| Topical serum or cream | Oral tablets | Intradermal microinjection | |
|---|---|---|---|
| How it is used | Applied daily, often with other brightening ingredients | Taken by mouth daily for a course of months | Tiny amounts injected into the patch, or delivered with microneedling |
| Who supplies it | Skincare serums; prescription creams from a doctor | A doctor, after screening | A doctor, as a clinic procedure |
| Speed | Slower; benefit from about week 8 in studies | Fastest; benefit from about week 4 | Benefit from about week 8 |
| Evidence | Smaller trials; works better combined with other agents | Randomised trials and large case series | Small trials; similar to other routes over time |
| Main side effects | Mild dryness or irritation | Stomach upset, headache, period changes; rare clots | Stinging, bruising; PIH risk from needling |
| Clot-risk screening | Not usually needed | Essential before starting | Discussed with the doctor |
| Often suits | Mild melasma, maintenance, people who cannot take tablets | Moderate or stubborn melasma, with no clot risk factors | Localised patches, or when tablets are unsuitable |
Topical
Tranexamic acid serums and creams: gentle but slow
Many skincare serums now contain tranexamic acid, often alongside niacinamide or other brightening ingredients, and doctors can also prescribe compounded creams. Topical TXA is well tolerated and has no meaningful clot risk, which makes it useful for mild melasma, for maintenance after a course of tablets, and for people who cannot take oral TXA.
Expect a slow change. In pooled studies, topical TXA began to separate from placebo only after about eight weeks, and on its own it is less effective than oral TXA combined with standard creams. It works better as one part of a routine that includes daily sunscreen and, where suitable, azelaic acid or a prescription lightening cream.
Concentrations and formulations vary widely between products, and few have been tested in trials. Patch-test a new serum, avoid layering several strong actives at once, and stop if the skin becomes red or stings persistently, because irritation itself can darken melasma.
Oral
Oral tranexamic acid: the most studied form
In a randomised, placebo-controlled trial of 44 patients with moderate to severe melasma, 250 mg of TXA twice daily for three months, with sunscreen, reduced melasma scores by 49%, compared with 18% on placebo. Three months after stopping, much of the gain had faded: scores were 26% below baseline in the TXA group and 19% in the placebo group.
The largest real-world study comes from Singapore. Among 561 patients treated at a tertiary dermatology centre, 89.7% improved, usually within two months, over a median of four months; 27.2% of responders relapsed. Side effects occurred in 7.1%, mostly mild stomach upset or headache. One patient developed a deep vein thrombosis and was later found to have an inherited clotting disorder (protein S deficiency), which is why screening matters.
The doses studied for melasma are low, such as 250 mg twice daily, and the course is reviewed after a few months. Do not buy tablets online or take someone else's: the dose, duration and suitability are a doctor's decision.
Safety
Who should not take oral tranexamic acid
Studies of low-dose TXA for melasma have not shown a clear rise in clots, but a small risk cannot be ruled out, so a doctor takes a careful personal and family history before prescribing.
Stop the tablets and seek medical help at once if you notice pain or swelling in one leg, sudden breathlessness or chest pain, weakness or numbness in any part of the body, or a change in vision.
- Anyone with a past or current blood clot in the legs, lungs or elsewhere.
- People who have had a stroke, a heart attack or ischaemic heart disease.
- A personal or family history of a clotting disorder.
- Women taking the combined contraceptive pill: the combination may add a small extra clot risk, so the doctor weighs it carefully.
- Smokers, especially on the pill, and anyone recently immobile after surgery or illness.
- People with kidney problems, epilepsy or seizures, or changes in colour vision.
- Pregnancy, trying to conceive or breastfeeding: tell the doctor, as oral TXA for melasma is usually not started then.
Intradermal
Intradermal tranexamic acid and microneedling
TXA can also be placed directly into the melasma patch. In an early study of 100 Korean women, tiny intradermal injections at 1 cm intervals, given weekly for 12 weeks, lowered melasma scores from about 13 to 8 among the 85 who completed it, with minimal side effects. Later trials have also delivered TXA through microneedling.
These methods use very small amounts of TXA, but they are clinic procedures performed by a doctor, and in Asian skin any needling carries a risk of post-inflammatory darkening. In the 2024 network meta-analysis, injected and microneedled TXA began to help from about week eight, later than tablets. Home microneedling with TXA serums is not advised, because of infection and irritation risk.
Combining
Combining tranexamic acid with sunscreen, azelaic acid and lasers
Sunscreen comes first. Use a broad-spectrum sunscreen every day and reapply outdoors; tinted sunscreens that contain iron oxides also help block visible light, which can darken melasma in Asian skin.
Azelaic acid pairs well with TXA: it is gentle, reduces pigment production and can be used during maintenance. A doctor may also prescribe a short, supervised course of a stronger lightening cream, sometimes containing hydroquinone or tretinoin, which should not be used without medical supervision.
Laser can be added for stubborn melasma. A 2023 meta-analysis of nine studies found that combining laser with topical TXA lowered melasma scores. Settings matter: low-energy, repeated sessions such as 1064 nm laser toning are preferred, because aggressive heat can trigger more pigment.
Singapore UV
Singapore's sun, heat and melasma relapse
Singapore's UV is high all year, and heat and visible light also feed melasma, so the triggers never take a season off. That is the main reason melasma returns after tablets stop: in the Singapore study, more than a quarter of people who improved later relapsed.
Practical habits help: sunscreen every morning, reapplication at lunch if you are out, a broad-brimmed hat and shade, and avoiding long spells in hot kitchens or saunas where possible. Hormones matter too; melasma can start or worsen in pregnancy or on hormonal contraception, which is worth mentioning to the doctor.
Plan for maintenance from the start: a gentle topical routine, strict sun protection and, if needed, a repeat course or occasional laser sessions under a doctor's review.
Where to go
Tranexamic acid and melasma care in our network
Melasma is a medical diagnosis, and it is often confused with Hori's naevus, sun spots or post-acne marks, which need different treatment. At IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, beside Orchard MRT, Dr Sin Yong examines the pigment, takes a clot-risk history and prescribes tranexamic acid when suitable, often alongside creams and, where needed, Laser Toning or Pico Laser. Treatment is priced at consultation by the clinic; WhatsApp +65 8815 3008.
SkinRev Lab, at #B1-28 CityLink Mall by City Hall MRT, is a non-invasive centre and does not prescribe or inject. The Needleless SkinBooster with a pigmentation and tone booster (S$288 per region before GST, first region from S$98) and HydraFacial Syndeo (from S$288 before GST) can support hydration and overall tone, but they do not treat melasma.
Sources
References & sources
- Lee HC, Thng TG, Goh CL. Oral tranexamic acid (TA) in the treatment of melasma: a retrospective analysis. J Am Acad Dermatol. 2016;75(2):385-392.
- Del Rosario E, Florez-Pollack S, Zapata L Jr, et al. Randomized, placebo-controlled, double-blind study of oral tranexamic acid in the treatment of moderate-to-severe melasma. J Am Acad Dermatol. 2018;78(2):363-369.
- Liang R, Luo H, Pan W, et al. Comparative efficacy and safety of tranexamic acid for melasma by different administration methods: a systematic review and network meta-analysis. J Cosmet Dermatol. 2024;23(4):1150-1164.
- Khan QA, Abdi P, Farkouh C, et al. Effectiveness of laser and topical tranexamic acid combination therapy in melasma: an updated systematic review and meta-analysis of randomized controlled trials. Lasers Med Sci. 2023;38(1):139.
- Ali FR. Tranexamic acid. DermNet NZ.
- HealthHub (Ministry of Health Singapore). Tranexamic acid (oral): medication information leaflet. Last reviewed 16 December 2024.
- NHS (UK). Taking tranexamic acid with other medicines and herbal supplements.
Common questions
Your questions,
answered
Does tranexamic acid work for melasma?
Yes, for many people. In a placebo-controlled trial, oral TXA reduced melasma scores by 49% in three months, and in a Singapore study about nine in ten patients improved. It does not stop melasma for good, and relapse after stopping is common, so sun protection and maintenance are needed.
Is oral tranexamic acid safe?
At the low doses used for melasma, side effects are usually mild, such as stomach upset, headache or period changes. Studies have not shown a clear rise in blood clots, but the risk cannot be ruled out, so a doctor screens your personal and family history before prescribing.
Who should not take tranexamic acid tablets?
People with a history of blood clots, stroke, heart disease or a clotting disorder should not take it for melasma. Extra caution is needed with the combined pill, smoking, kidney problems, epilepsy, pregnancy and breastfeeding. Tell the doctor about all your medicines.
Tranexamic acid serum or tablets: which works better?
Tablets work faster and have stronger evidence, but need a prescription and screening. Serums are gentler and low-risk but slow, and work better combined with other ingredients. Many people use tablets for a course and a serum for maintenance.
How long does tranexamic acid take to work for melasma?
Oral TXA often shows an effect within one to two months, and courses usually run a few months before review. Topical and injected forms tend to take about two months or more. Daily sunscreen throughout makes a large difference.
Can I use tranexamic acid with niacinamide, azelaic acid or retinoids?
Usually yes. Topical TXA is commonly combined with niacinamide and azelaic acid. Retinoids such as tretinoin can also be part of a doctor's plan, but introduce one strong active at a time, because irritation can make melasma darker.
Will melasma come back after stopping tranexamic acid?
Often, yes. In the Singapore study, 27% of people who improved relapsed, and in a placebo-controlled trial much of the gain faded within three months of stopping. Sun protection, a maintenance routine and doctor review help keep it under control.
Can I take tranexamic acid while on the pill?
Talk to the doctor first. The combined contraceptive pill raises clot risk on its own, and taking it with TXA may add a small extra risk, especially if you smoke. The doctor will decide whether oral TXA is appropriate or suggest topical options instead.
How much does tranexamic acid treatment cost in Singapore?
It depends on the form, the length of the course and whether creams or laser are part of the plan. At IN Eternity Clinic, melasma treatment is priced at consultation by the clinic, after Dr Sin Yong has assessed your skin and history.