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Bile acid sequestrants are polymeric compounds that serve as ion-exchange resins. Bile acid sequestrants exchange anions such as chloride ions for bile acids. By doing so, they bind bile acids and sequester them from the enterohepatic circulation. The liver then produces more bile acids to replace those that have been lost.
Colesevelam is part of a class of drugs known as bile acid sequestrants. Colesevelam hydrochloride, the active pharmaceutical ingredient in Welchol, is a non-absorbed, lipid-lowering polymer that binds bile acids in the intestine, impeding their reabsorption. As the bile acid pool becomes depleted, the hepatic enzyme, cholesterol 7-α ...
Finally, the conjugated bile acids which remained un-ionized conjugated bile acids are passively absorbed. Venous blood from the ileum goes straight into the portal vein and then into the liver sinusoids. There, hepatocytes extract bile acids very efficiently, and little escapes the healthy liver into systemic circulation.
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Bile acid sequestrants are the main agents used to treat bile acid malabsorption. [25] Cholestyramine and colestipol , both in powder form, have been used for many years. Unfortunately, many patients find them difficult to tolerate; although the diarrhea may improve, other symptoms such as abdominal pain and bloating may worsen.
Bile acid sequestrants (resins, e.g. cholestyramine) are particularly effective for lowering LDL-C by sequestering the cholesterol-containing bile acids released into the intestine and preventing their reabsorption from the intestine. It decreases LDL by 15–30% and raises HDL by 3–5%, with little effect on triglycerides, but can cause a ...
Colestipol (trade names Colestid, Cholestabyl) is a bile acid sequestrant used to lower blood cholesterol, specifically low-density lipoprotein (LDL). [1] [2] It is also used to reduce stool volume and frequency, and in the treatment of chronic diarrhea. [3]
Managing cholesterol at the site of absorption is an increasingly popular strategy in the treatment of hypercholesterolemia [citation needed].Cholesterol absorption inhibitors are known to have a synergistic effect when combined a class of antihyperlipidemics called statins, to achieve an overall serum cholesterol target.