Tranexamic Acid for Melasma: Who Should Avoid It?

Oral tranexamic acid for melasma is usually judged 2 to 3 months after you start taking it. It isn't started if you've had a blood clot, have been told you clot easily, or use a birth control method that combines estrogen and a progestin. Melasma can darken again after you stop, so the plan should cover what happens after the last pill, too.

How Long Do You Take Oral Tranexamic Acid for Melasma?

How Long Do You Take Oral Tranexamic Acid for Melasma?

The first real checkpoint is 2 to 3 months after you start. The usual melasma dose is about 500 mg a day, taken as 250 mg twice daily. Even over a short 8 to 12 weeks at that dose, benefits have been reported in Asian skin.

In a trial that split 44 people into two groups, melasma scores fell 49% in the group taking the pill for 3 months, compared with 18% in the placebo group. Both groups used sunscreen. Keep in mind that it was a single-center study of mostly Hispanic women, so the numbers may not carry over exactly to your skin.

How Long Do You Take Oral Tranexamic Acid for Melasma?

A review of 561 patient records in Singapore found a median treatment length of 4 months. Of those patients, 89.7% improved, 10.0% saw no change, and 0.4% got worse. People with a family history of melasma improved less often (60.0%) than those without one (90.6%). Individual results vary, and that study looked back at records without a comparison group.

Studies used anywhere from 8 weeks to almost 2 years, so there's no set course length. That's why the decision to keep going is made by comparing photos at the 2 to 3 month mark.

How Can a Pill Lighten Melasma?

How Can a Pill Lighten Melasma?

Tranexamic acid was first used to help bleeding stop. It blocks the step that makes plasmin, the enzyme that breaks down blood clots.

Plasmin: An enzyme in your body that dissolves clots.

In melasma, it's thought to shrink small blood vessels in the dermis and to make pigment cells produce less melanin. The full mechanism still isn't clear. Creams work from the skin surface, while the pill reaches the vessels and the signals around pigment cells.

How Can a Pill Lighten Melasma?

Using it for skin conditions is off-label. In the US, tranexamic acid tablets are FDA-approved for heavy menstrual bleeding, not melasma. Over a month, the melasma dose of 250 mg twice a day adds up to roughly the same total as a monthly course for heavy periods. One review suggests considering the pill when brightening creams haven't helped after about 12 weeks. Because it's a drug that helps blood clot, the conversation naturally turns to clot risk next.

Who Shouldn't Take Tranexamic Acid for Melasma?

Who Shouldn't Take Tranexamic Acid for Melasma?

If you have any clot-related history, oral tranexamic acid for melasma isn't started. It's better to hold off on the pill and look at other options first in these cases:

• You have a blood clot now, or you've had a deep vein clot, a lung clot, a clot in the brain, or a blocked blood vessel in the eye
• You've been told you clot easily, or a family member has a blood clotting disorder
• You use birth control that combines estrogen and a progestin, such as a pill, patch, or vaginal ring
• You've had heart disease from blocked arteries or a stroke
• Your kidneys work poorly, or you've had a seizure
• You've had an allergic reaction to tranexamic acid

Taking it with combined hormonal birth control raises clot risk, and that's a particular concern for women who are obese or smoke, especially smokers over 35*.

Based on the US prescribing information for tranexamic acid tablets.

In the 561-record review, one person developed a deep vein clot and was later diagnosed with an inherited clotting disorder (protein S deficiency). That's why a consultation asks about clots in your parents and siblings, not just you. The pill isn't meant for use in pregnancy, and small amounts pass into breast milk, so mention it if you're pregnant, planning a pregnancy, or breastfeeding. Long-term safety, especially in older adults, still isn't well known.

Which Side Effects Pass, and Which Mean Stop?

Which Side Effects Pass, and Which Mean Stop?

Side effects showed up in 7.1% of people in the 561-record review, and most were short-lived. Reported ones include stomach pain, bloating, nausea, headache, changes in period flow or timing, and more hair shedding than usual. If any of these keep bothering you, tell the clinic that prescribed it instead of waiting for your next visit.

Don't wait on these:

• Blurry vision, colors looking different, or any other change in your eyes. Stop the pill right away and see an eye doctor.
• Severe shortness of breath with a tight throat. Stop the pill and go to the nearest emergency room.
• Swelling of the lips or around the eyes, or a racing heartbeat. Stop the pill and contact the prescribing clinic right away.

Does Melasma Come Back After You Stop?

Does Melasma Come Back After You Stop?

It can. In the 561-record review, 27.2% of people who improved saw their melasma return. Melasma is a long-term condition, and summer sun can bring it back. Keep using a broad-spectrum SPF 50+ sunscreen with iron oxides and a wide-brimmed hat all year, even after the last pill. Hormonal birth control can also make melasma darker, so it's worth asking the doctor who prescribed it whether you can switch.

Planning Around a Seoul Trip

Unless you've had IV sedation that day, there's no reason to delay a flight after a clinic visit. Starting a pill doesn't involve sedation, so flying home isn't the issue. What matters more is that the first checkpoint comes 2 to 3 months later, well after most trips end.

One visit is a starting point, not a finished plan. Melasma tends to lighten gradually rather than all at once, and how much you see depends on your skin. After you fly home, you can message the clinic with photos if questions come up. If you notice warning signs such as eye changes or trouble breathing, see a local doctor or emergency service first.

What to Bring to Your Consultation

Take a photo on the day you start, in the same light and from the same angle, and take another 8 to 12 weeks later. That pair makes it much easier to judge the change yourself. At the consultation, ask, "When will we judge whether this works for me, and what's the plan after I stop?" STON Clinic is in Seoul's Myeongdong area, inside Lotte Hotel Seoul near Euljiro 1-ga Station. When you reach out, list every medicine you take (including birth control or other hormones), any clot history in you or your family, and whether you smoke.