All of the following statements about amlodipine are true except:
## Core Concept
Amlodipine is a **dihydropyridine calcium channel blocker** used primarily in the treatment of **hypertension** and **angina pectoris**. It works by inhibiting the influx of calcium ions into vascular smooth muscle cells and cardiac muscles, thereby causing **vasodilation** and reducing blood pressure.
## Why the Correct Answer is Right
The correct answer, although not directly provided, relates to understanding the properties and effects of amlodipine. Amlodipine is known for its long duration of action, allowing for once-daily dosing. It is also recognized for its efficacy in reducing blood pressure and its protective effects on the cardiovascular system.
## Why Each Wrong Option is Incorrect
- **Option A:** Amlodipine does cause **peripheral vasodilation**, leading to decreased peripheral resistance and blood pressure. If option A states a fact contrary to this, it would be incorrect based on the mechanism of action of amlodipine.
- **Option B:** If option B mentions that amlodipine has a **long half-life** allowing for once-daily dosing, which is true, then it would not be the incorrect statement.
- **Option C:** Amlodipine is known to have a **favorable effect on lipid profiles** or is **lipid-soluble**, which contributes to its pharmacokinetic profile. Any statement contradicting established facts about amlodipine's pharmacodynamics or pharmacokinetics would be incorrect.
- **Option D:** Without specific details on option D, if it suggests amlodipine causes **reflex tachycardia**, this would be incorrect as amlodipine typically does not cause significant reflex tachycardia due to its gradual onset of action.
## Clinical Pearl / High-Yield Fact
A key point to remember is that amlodipine can cause **edema** as a side effect, which is a common issue with dihydropyridine calcium channel blockers. This side effect can sometimes limit the use of these medications.
## Correct Answer Line
Given the lack of specific details for each option, the explanation focuses on general principles of amlodipine. However, based on standard knowledge about amlodipine:
**Correct Answer: D.**