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Toxicology – Cocaine and Crack Toxicity
Source
Cocaine is derived from the leaves of the coca plant. It is commonly used as a powder for nasal insufflation, while crack cocaine is a solid form that is typically smoked using a pipe or glass tube.
Typical Presentation
Use often produces an immediate sense of intense euphoria, energy, and confidence. These effects are short-lived, leading to repeated dosing. As toxicity develops, individuals may experience anxiety, paranoia, palpitations, and chest pain.
Clinical Features
Cocaine toxicity presents as a classic sympathomimetic toxidrome, including tachycardia, hypertension, vasoconstriction (both peripheral and coronary), dilated pupils, sweating, hyperthermia, and agitation. Severe complications may include seizures, rhabdomyolysis, cardiac arrhythmias, and coma.
Mechanism of Action
Cocaine exerts its effects by blocking the reuptake of serotonin, dopamine, and norepinephrine, resulting in increased sympathetic activity. It also blocks sodium channels, giving it local anesthetic properties and contributing to cardiac conduction abnormalities and arrhythmias.
Management
Treatment is primarily supportive. Benzodiazepines are first-line therapy for agitation, anxiety, and chest pain. Aspirin and nitroglycerin are safe and effective in managing cocaine-associated chest pain. Beta-blockers should be avoided due to the risk of unopposed alpha-adrenergic stimulation; calcium channel blockers are a safer alternative if needed.
Key Points
Source
Cocaine is derived from the leaves of the coca plant. It is commonly used as a powder for nasal insufflation, while crack cocaine is a solid form that is typically smoked using a pipe or glass tube.
Typical Presentation
Use often produces an immediate sense of intense euphoria, energy, and confidence. These effects are short-lived, leading to repeated dosing. As toxicity develops, individuals may experience anxiety, paranoia, palpitations, and chest pain.
Clinical Features
Cocaine toxicity presents as a classic sympathomimetic toxidrome, including tachycardia, hypertension, vasoconstriction (both peripheral and coronary), dilated pupils, sweating, hyperthermia, and agitation. Severe complications may include seizures, rhabdomyolysis, cardiac arrhythmias, and coma.
Mechanism of Action
Cocaine exerts its effects by blocking the reuptake of serotonin, dopamine, and norepinephrine, resulting in increased sympathetic activity. It also blocks sodium channels, giving it local anesthetic properties and contributing to cardiac conduction abnormalities and arrhythmias.
Management
Treatment is primarily supportive. Benzodiazepines are first-line therapy for agitation, anxiety, and chest pain. Aspirin and nitroglycerin are safe and effective in managing cocaine-associated chest pain. Beta-blockers should be avoided due to the risk of unopposed alpha-adrenergic stimulation; calcium channel blockers are a safer alternative if needed.
Key Points
- Beta-blockers can worsen coronary vasoconstriction in cocaine toxicity and should be avoided.
- Cocaine is often adulterated with substances such as levamisole, which can cause serious complications including agranulocytosis and vasculitis.
- Crack cocaine is a highly addictive, smokable form known for rapid onset and intense effects.
- Some users combine cocaine with opioids (“speedballing”), increasing the risk of severe toxicity and overdose.
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