Lonsurf mechanism?

What is Lonsurf, and how does it work?

Lonsurf is the brand name for trifluridine/tipiracil (also written as trifluridine–tipiracil). It combines two drugs with different roles: trifluridine is the active anti-cancer agent, and tipiracil helps keep trifluridine working longer in the body.

How does trifluridine kill cancer cells?

Trifluridine is an analogue of DNA building blocks. After it gets into cells, it gets incorporated into DNA and disrupts normal DNA function. The result is that cancer cells cannot maintain or replicate their DNA properly, which pushes them toward cell death.

What does tipiracil do (why pair it with trifluridine)?

Tipiracil inhibits an enzyme that would otherwise break down trifluridine too quickly. By slowing that breakdown, tipiracil increases the time that trifluridine stays available at effective levels.

Why is this drug used for colorectal cancer (mechanism in that context)?

Lonsurf targets tumor growth by interfering with the cancer cell’s ability to perform DNA replication and repair. That matters most in rapidly dividing cells such as colorectal cancer cells.

Any key mechanism-related cautions patients ask about?

Because Lonsurf interferes with DNA handling, it can affect both cancer cells and normal rapidly dividing cells (which is why blood count changes like neutropenia are commonly discussed with this class of therapy).