Tranexamic acid, or tranexamic acid tablets, there is no authoritative information on how long it takes for tranexamic acid tablets to be effective in treating melasma, and it usually takes 6 to 16 months. Tranexamic acid tablets are mainly used for the treatment of all kinds of bleeding caused by acute or chronic primary hyperfibrinolysis, and can also be used for the treatment of melasma. Tranexamic acid tablets for melasma can not be generalized regardless of the time of effect, usually between 6 to 16 months to see the effect. If the patient’s symptoms are more serious, the treatment time will be prolonged, and the specific effect time needs to be judged according to the patient’s condition as well as the speed of the patient’s drug absorption. Chloasma is mainly caused by facial pigmentation, tranexamic acid tablets have the effect of inhibiting the stimulation of melanin by various cytokines, which can reduce melanin synthesis, so it has the effect of treating chloasma. The specific effect time of tranexamic acid tablets in treating melasma needs to be judged according to the patient’s condition, and the patient should follow the doctor’s prescription and take the medicine according to the course of treatment, and should not change the dosage or stop taking the medicine without authorization.