Which of the following drug is commonly responsible for ohostatic hypotension: March 2010
**Core Concept**
Orthostatic hypotension is a condition characterized by a significant drop in blood pressure upon standing, often due to **autonomic nervous system dysfunction** or **volume depletion**. This can be exacerbated by certain medications that interfere with the body's ability to regulate blood pressure. **Antihypertensive drugs** and **antipsychotics** are common culprits.
**Why the Correct Answer is Right**
Although the specific correct answer is not provided, a common class of drugs responsible for orthostatic hypotension includes **tricyclic antidepressants** and **alpha-blockers**. These drugs can cause orthostatic hypotension by either blocking alpha-1 adrenergic receptors, which are crucial for vasoconstriction, or by affecting the autonomic nervous system's control over blood vessel tone.
**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specific option, it's hard to comment, but if it were a drug like **fluoxetine**, a selective serotonin reuptake inhibitor (SSRI), it would be less likely to cause orthostatic hypotension compared to other classes of drugs.
**Option B:** Similarly, without specifics, if this were a **beta-blocker**, it might not typically cause orthostatic hypotension as a primary side effect, though it could contribute to it in certain contexts.
**Option C:** If this option were a **calcium channel blocker**, while it can cause hypotension, it's not as commonly associated with orthostatic hypotension as other drug classes.
**Option D:** Without the specific option, if it were a drug not known to significantly lower blood pressure or affect autonomic function, it would be an unlikely cause.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **elderly patients** are particularly susceptible to orthostatic hypotension due to age-related changes in blood vessel compliance and autonomic function. Recognizing and managing orthostatic hypotension is crucial in this population to prevent falls and other complications.
**Correct Answer:** Not provided in the query.