Tranexamic acid has become one of the most talked-about melasma treatments, and it comes in two very different forms.
The serum you can buy today. The tablet requires a prescription and a screening conversation.
They work through the same pathway. The difference is how much of it reaches your skin, and what else the medication touches on the way there.
These two are the same molecule, so the pigment row is identical — both interrupt the signal that switches pigment cells on. The grid cannot show the only variable that matters here, which is delivery. A serum reaches the outer layers of the skin it is spread across; a tablet reaches every pigment cell in the face at a steady concentration. That is why the oral form wins on widespread melasma and why it carries considerations the serum does not.
Widespread or stubborn melasma | Oral | Moderate to strong
This is the main reason to consider the pill. It reaches the whole face evenly and consistently outperforms the topical in studies of resistant cases.
Mild or localized patches | Topical | Moderate
A serum is often enough, and it avoids taking a systemic medication for a cosmetic concern.
Safety and simplicity | Topical | Consensus
No screening, no blood clot considerations, no prescription. The worst realistic outcome is that it does not work.
Speed | Oral | Moderate
Many people see change within 8–12 weeks on the tablet, and often sooner than with the serum alone.
Cost | Depends | —
Generic tranexamic acid tablets are inexpensive. Good topical serums are not always cheaper.
Who can take it | Topical | Consensus
The serum has essentially no exclusions. The tablet is not appropriate for anyone with a personal or family history of blood clots, certain clotting disorders, or some other medical conditions — which is a real fraction of people.
Staying on it long-term | Topical | Moderate
The serum can be used indefinitely. The tablet is usually given in courses of a few months and then reassessed.
Skin of color | Either | Consensus
Both are used heavily in deeper skin tones, where melasma is most common and most persistent. Neither carries the discoloration risk that long hydroquinone use does.
Using both is common, and the topical is usually the one you keep.
A sensible order:
- Start: topical tranexamic acid plus daily tinted mineral sunscreen, for 3 months.
- Escalate: if melasma is widespread or has not moved, discuss the oral form with a dermatologist.
- Maintain: stay on the topical after finishing a course of the tablet.
The tablet is off-label for melasma. That is not a red flag by itself — off-label prescribing is common and legal — but it does mean the dosing comes from research and clinical experience rather than an FDA-approved label, and it makes the prescriber's judgment more important, not less.
Screening questions you should expect: any personal or family history of blood clots, clotting disorders, recent surgery, prolonged immobility, or medications that affect clotting. If nobody asks you these, ask why.
Neither replaces sun protection. A tinted mineral sunscreen with iron oxides blocks the visible light that drives melasma. Without it, both routes underperform.
Note: this page is educational. Whether an oral medication is appropriate for you is a decision for you and your own doctor, based on your history.