Will Besudil/Yilaike be effective after three days? Is it reliable?

Belumosudil mesylate tablets (Belumosudil) is a targeted drug with complex mechanism of action and immunomodulation as its core. It regulates the balance between Th17 and regulatory T cells (Treg) by blocking the ROCK2 signaling pathway, thereby improving abnormal activation of the immune system and tissue fibrosis. This process does not happen instantaneously, so the statement that "it takes three days to see results" is not scientific.

From a pharmacokinetic perspective, besudil is absorbed quickly after oral administration, but its real efficacy depends on the gradual remodeling of the immune system. Generally speaking, clinically, most patients need to take medication continuously for 2 to 4 weeks before they can observe an obvious improvement trend. Some patients with complex conditions may even need several months to stabilize their condition. After only 3 days of medication in the early stage, although the drug concentration in the body may have reached a steady state, immune remodeling and fibrosis suppression have not yet fully occurred, so the probability of significant efficacy at this time is extremely low.

In the study, some patients experienced slight improvement in symptoms, such as rash reduction or joint stiffness relief, about 1 week after taking the drug. However, these changes belong to the early immune response stage of the drug and do not mean the completion of the treatment or complete control of the disease. If you blindly evaluate the efficacy and adjust medication at this time, it will affect the overall treatment effect.

The evaluation of the efficacy of besudil is usually based on the type of disease and the patient's response period. For example, in patients with chronic GVHD, doctors usually use the "12-week treatment course" as the evaluation point and judge the response by observing indicators such as skin, liver function, or lung function. For some patients with milder immune imbalances, besudil may also show stable improvement in about a month.

Therefore, there is no scientific basis for saying that results will be effective within three days. Treatment with besudil requires patience and continuous monitoring, especially in immune diseases, where the accumulation of therapeutic effects takes time. Patients should follow the doctor's instructions and take medications regularly, and avoid interrupting treatment or changing medications due to high expectations.

Reference: https://www.drugs.com/pro/rezurock.html