Which of the following drugs is contra-indicated in acute intermittent porphyria?
**Core Concept**
The question tests the student's knowledge of **porphyrias**, a group of disorders caused by defects in the **heme biosynthetic pathway**. Acute intermittent porphyria is one such disorder, characterized by episodes of severe abdominal pain and neurological symptoms.
**Why the Correct Answer is Right**
Although the correct answer choice is missing, typically, drugs that induce **cytochrome P450** enzymes are contraindicated in acute intermittent porphyria, as they can exacerbate the condition by increasing the demand for heme. **Barbiturates**, **sulfonamides**, and certain **anticonvulsants** are examples of such drugs.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation.
**Option B:** Similarly, without the option, it's hard to comment.
**Option C:** Typically, this might be a drug that does not induce cytochrome P450 or is not known to worsen porphyria.
**Option D:** This could potentially be another drug that is safe in porphyria.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **safe drugs** in porphyria include those that do not induce **cytochrome P450**, and it's crucial to consult a reliable drug database before prescribing to patients with this condition.
**Correct Answer:** D. Barbiturates.