All of the following are short acting benzodiazepines except
**Core Concept**
Short-acting benzodiazepines are a class of anxiolytic medications that produce rapid onset of action, but have a relatively short half-life, typically less than 20 hours. This class of medications is often used for acute anxiety, insomnia, and seizures due to their rapid onset and relatively short duration of action.
**Why the Correct Answer is Right**
The correct answer is a short-acting benzodiazepine that is commonly used for its anxiolytic and sedative properties. Its short half-life allows for quick recovery from sedation and is less likely to cause dependence. The mechanism of action of short-acting benzodiazepines involves enhancing the activity of the neurotransmitter GABA (gamma-aminobutyric acid) at the GABA_A receptor, resulting in a calming effect on the nervous system.
**Why Each Wrong Option is Incorrect**
**Option A:** Midazolam is a short-acting benzodiazepine, often used for its anxiolytic and sedative effects, especially in the perioperative period. It has a short half-life, typically around 1.5-2.5 hours.
**Option B:** Lorazepam is a short-acting benzodiazepine, commonly used for its anxiolytic and sedative properties. Its short half-life, around 12-18 hours, allows for quick recovery from sedation.
**Option C:** Diazepam is a long-acting benzodiazepine, often used for its anxiolytic and sedative effects, as well as its muscle relaxant properties. Its long half-life, typically around 20-70 hours, makes it less suitable for acute anxiety or insomnia.
**Clinical Pearl / High-Yield Fact**
When choosing a benzodiazepine, consider the duration of action and the patient's specific needs. Short-acting benzodiazepines are ideal for acute anxiety or insomnia, while long-acting benzodiazepines may be more suitable for chronic anxiety or muscle spasms.
**Correct Answer:** D. Diazepam