Tucatinib is a tiny medicine made just for people with HER2-positive breast cancer that’s spread to the brain. It works by keeping the HER2 from doing its thing, which is like turning off the HER2 signaling circuit. You get Tucatinib in two strengths: 50 mg and 150 mg, and it comes in pills with a coating to make them easier to swallow.
For adults, the go-to dose is 300 mg, taken two times a day with food. Each bottle of Tucatinib holds 60 pills.
