**Question:** At room temperature reconstituted solutions of Thiopentone is stable for:

**Core Concept:**
Thiopentone is a barbiturate anesthetic agent used for induction of general anesthesia. Injectable solutions of thiopentone require reconstitution before use. Stability of reconstituted solutions is crucial for patient safety and reliable anesthesia induction.

**Why the Correct Answer is Right:**
Thiopentone solutions reconstituted at room temperature are stable for approximately 24 hours. This is because the reconstituted solution acts as a buffered system, maintaining a pH close to the physiological range (around 7.4). This stability allows for a consistent and effective anesthesia induction when administered within the recommended timeframe.

**Why Each Wrong Option is Incorrect:**
A. Less than 24 hours (incorrect)
B. Less than 4 hours (incorrect)
C. Less than 6 hours (incorrect)
D. Less than 8 hours (incorrect)

**Why the Correct Answer is Right:**
The correct answer (24 hours) is based on the stability of the reconstituted thiopentone solution, which maintains its therapeutic properties for a longer period due to the buffered pH system. This allows for safe and reliable anesthesia induction when administered within the recommended timeframe.

**Clinical Pearl:**
Reconstituted thiopentone solutions should be used within 24 hours to ensure optimal pharmacokinetic and pharmacodynamic properties for safe anesthesia induction. After this time, the solution may become less effective or even cause adverse reactions due to degradation of the drug and changes in pH.

**Correct Answer:** 24 hours