All are adulterants of heroin, except
**Core Concept**
Heroin is a highly addictive opioid derived from morphine, often adulterated with various substances to increase its potency or weight. Adulterants can be toxic or cause unpredictable reactions when combined with heroin, posing significant health risks to users.
**Why the Correct Answer is Right**
Heroin is commonly adulterated with substances like quinine, lidocaine, and caffeine. These adulterants are often added to increase the perceived potency of the drug or to mask its appearance. However, they can cause serious health problems, including cardiac arrhythmias, seizures, and even death. Adulterants can also interact with other substances in the body, leading to unpredictable reactions.
**Why Each Wrong Option is Incorrect**
**Option A:** Quinine is a known adulterant of heroin, used to increase its weight and perceived potency. It can cause serious health problems, including cardiac arrhythmias and seizures.
**Option B:** Lidocaine is another common adulterant of heroin, added to mask its bitter taste and increase its potency. It can cause cardiac arrhythmias and other serious health problems.
**Option C:** Caffeine is sometimes used as an adulterant of heroin, added to increase its weight and perceived potency. However, it can also interact with other substances in the body, leading to unpredictable reactions.
**Clinical Pearl / High-Yield Fact**
It's essential for medical professionals to be aware of the common adulterants of heroin and their potential health risks. Users may present with a range of symptoms, from mild to life-threatening, and prompt identification and treatment are crucial to prevent serious harm.
**Correct Answer: D.**