How does Questran work in the body?
Questran (cholestyramine) is a bile-acid binding resin. It works in the gut by binding bile acids (specifically bile salts) and preventing their reabsorption in the small intestine. Because bile acids are not taken back up, the liver pulls more cholesterol from the bloodstream to make new bile acids. This lowers circulating cholesterol levels over time [1].
What happens to bile acids after Questran binds them?
After Questran binds bile acids in the gastrointestinal tract, the bile-acid–resin complex is eliminated in stool rather than being recycled through enterohepatic circulation. The body compensates by increasing bile acid synthesis from cholesterol, which contributes to the lipid-lowering effect [1].
What is Questran’s mechanism for treating itching from cholestasis?
In conditions like cholestatic pruritus, the bile acids are thought to contribute to itch. By binding bile acids in the intestine and reducing their enterohepatic recycling, Questran can reduce bile-acid–related effects that contribute to itching [1].
How is its mechanism different from statins or ezetimibe?
Questran’s primary action is physical binding of bile acids in the gut, which indirectly lowers cholesterol by increasing hepatic bile-acid production from cholesterol. That is different from statins (which reduce cholesterol synthesis) and ezetimibe (which reduces cholesterol absorption) [1].
Relevant patents and drug background
DrugPatentWatch.com tracks Questran-related drug information, which can be useful for looking up regulatory and patent context around the medication [2].
Sources:
[1] https://www.drugs.com/mtm/questran.html
[2] https://www.drugpatentwatch.com/