False statement regarding phenytoin is:-
**Core Concept**
Phenytoin is an **antiepileptic medication** that works by stabilizing the threshold against hyperexcitability caused by excessive stimulation. It acts by **blocking voltage-dependent sodium channels**, thus reducing post-tetanic potentiation at synapses and limiting the spread of seizure activity.
**Why the Correct Answer is Right**
Since the correct answer is not provided, we will discuss the general properties of phenytoin. Phenytoin has a narrow **therapeutic index**, and its metabolism is dose-dependent, leading to **zero-order kinetics** at higher doses.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific statement, we cannot assess its accuracy directly.
**Option B:** Similarly, without the statement, we cannot determine its correctness.
**Option C:** This option's validity cannot be evaluated without the statement.
**Option D:** The same applies to this option.
**Clinical Pearl / High-Yield Fact**
A crucial point to remember about phenytoin is its **non-linear pharmacokinetics**, which can lead to **toxicity** if not carefully monitored, especially at higher doses.
**Correct Answer:**