All of the following are true regarding chlorpropamide except:
**Core Concept**
Chlorpropamide is a first-generation sulfonylurea used in the management of type 2 diabetes mellitus. It stimulates insulin release from the pancreatic beta cells by closing ATP-sensitive potassium channels.
**Why the Correct Answer is Right**
Chlorpropamide works by binding to the sulfonylurea receptor (SUR) on the surface of pancreatic beta cells. This binding causes a conformational change in the receptor, which in turn closes the ATP-sensitive potassium channels (K(ATP) channels). The closure of these channels leads to depolarization of the beta-cell membrane, opening of voltage-gated calcium channels, and an influx of calcium ions. This increase in intracellular calcium triggers the exocytosis of insulin granules, resulting in increased insulin secretion. Chlorpropamide's effect is dose-dependent and can be influenced by factors such as renal function and co-administration with other medications.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not provide a specific characteristic of chlorpropamide. To make this option correct, it would need to state something like "Chlorpropamide is a first-generation sulfonylurea" or "Chlorpropamide is used in the management of type 2 diabetes mellitus."
**Option B:** This option is incorrect because it is a true statement about chlorpropamide. Chlorpropamide does indeed have a long duration of action, which can lead to prolonged hypoglycemia if not monitored properly.
**Option C:** This option is incorrect because it is a true statement about chlorpropamide. Chlorpropamide does indeed have a high risk of causing hypoglycemia, especially when used in combination with other antidiabetic medications or in patients with renal impairment.
**Clinical Pearl / High-Yield Fact**
Chlorpropamide is known for its long duration of action, which can lead to prolonged hypoglycemia. This makes it essential to monitor blood glucose levels regularly in patients taking chlorpropamide, especially when initiating or adjusting the dose.
**Correct Answer: D.**