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Toxicology – Levamisole Toxicity (Cocaine Adulterant)
Source
Levamisole is a medication originally used as an antiparasitic agent in veterinary medicine. It is now commonly encountered as an adulterant mixed with cocaine to enhance its appearance and perceived potency.
Typical Presentation
Patients are often individuals with a history of cocaine use who present with unexplained infections or unusual skin findings. Symptoms may develop after repeated exposure.
Clinical Features
A hallmark feature is vasculitis, appearing as purplish skin lesions, often involving the ears, face, and lower limbs. Patients may also experience fever and chills.
Laboratory findings frequently reveal severe neutropenia or agranulocytosis, increasing the risk of serious infections. In some cases, neurological complications such as leukoencephalopathy have been reported.
Mechanism of Action
Levamisole acts as an immunomodulatory agent. In humans, it can suppress bone marrow function in a dose-dependent manner, leading to dangerously low white blood cell counts. Its continued presence in illicit drugs contributes to repeated toxic exposure.
Management
Treatment primarily involves stopping exposure to the contaminated substance and providing supportive care. Management of infections and monitoring of blood counts are essential.
Key Points
Source
Levamisole is a medication originally used as an antiparasitic agent in veterinary medicine. It is now commonly encountered as an adulterant mixed with cocaine to enhance its appearance and perceived potency.
Typical Presentation
Patients are often individuals with a history of cocaine use who present with unexplained infections or unusual skin findings. Symptoms may develop after repeated exposure.
Clinical Features
A hallmark feature is vasculitis, appearing as purplish skin lesions, often involving the ears, face, and lower limbs. Patients may also experience fever and chills.
Laboratory findings frequently reveal severe neutropenia or agranulocytosis, increasing the risk of serious infections. In some cases, neurological complications such as leukoencephalopathy have been reported.
Mechanism of Action
Levamisole acts as an immunomodulatory agent. In humans, it can suppress bone marrow function in a dose-dependent manner, leading to dangerously low white blood cell counts. Its continued presence in illicit drugs contributes to repeated toxic exposure.
Management
Treatment primarily involves stopping exposure to the contaminated substance and providing supportive care. Management of infections and monitoring of blood counts are essential.
Key Points
- Strongly associated with cocaine use due to drug adulteration.
- Causes characteristic purplish skin lesions (vasculitis).
- Can lead to severe immune suppression (agranulocytosis).
- Risk of infection is high due to low white blood cell counts.
- May cause adverse reactions when combined with alcohol.
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