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Toxicology – Baclofen Toxicity
Source
Baclofen is a prescription muscle relaxant used to treat spasticity in conditions such as spinal cord injury, cerebral palsy, and multiple sclerosis. It is available in oral form and can also be administered via intrathecal pumps for targeted delivery.
Typical Presentation
Toxicity may occur following overdose or misuse. Patients often present with progressive central nervous system depression, which may initially resemble intoxication and later advance to severe neurological impairment.
Clinical Features
Findings are consistent with a sedative-hypnotic toxidrome. Symptoms include drowsiness, poor coordination, ataxia, slurred speech, nausea, vomiting, and altered mental status. Cardiovascular effects may include either low or high blood pressure and slow or fast heart rate. Neurologically, decreased reflexes, muscle relaxation, coma, seizures, apnea, and respiratory arrest can occur. In some cases, paradoxical muscle rigidity or spasms may be seen. Severe toxicity is more likely with large ingestions and may require prolonged intensive care support.
Mechanism of Action
Baclofen acts as a GABA(B) receptor agonist, producing inhibitory effects within the central nervous system. Abrupt discontinuation after chronic use can lead to a withdrawal syndrome similar to that seen with alcohol or benzodiazepines.
Management
Treatment is supportive, with close monitoring of airway, breathing, and circulation. Mechanical ventilation may be required in cases of significant respiratory depression.
Key Points
Source
Baclofen is a prescription muscle relaxant used to treat spasticity in conditions such as spinal cord injury, cerebral palsy, and multiple sclerosis. It is available in oral form and can also be administered via intrathecal pumps for targeted delivery.
Typical Presentation
Toxicity may occur following overdose or misuse. Patients often present with progressive central nervous system depression, which may initially resemble intoxication and later advance to severe neurological impairment.
Clinical Features
Findings are consistent with a sedative-hypnotic toxidrome. Symptoms include drowsiness, poor coordination, ataxia, slurred speech, nausea, vomiting, and altered mental status. Cardiovascular effects may include either low or high blood pressure and slow or fast heart rate. Neurologically, decreased reflexes, muscle relaxation, coma, seizures, apnea, and respiratory arrest can occur. In some cases, paradoxical muscle rigidity or spasms may be seen. Severe toxicity is more likely with large ingestions and may require prolonged intensive care support.
Mechanism of Action
Baclofen acts as a GABA(B) receptor agonist, producing inhibitory effects within the central nervous system. Abrupt discontinuation after chronic use can lead to a withdrawal syndrome similar to that seen with alcohol or benzodiazepines.
Management
Treatment is supportive, with close monitoring of airway, breathing, and circulation. Mechanical ventilation may be required in cases of significant respiratory depression.
Key Points
- High doses are associated with severe CNS depression, seizures, and prolonged coma.
- Baclofen toxicity can sometimes mimic brain death.
- The drug has potential for misuse due to its sedative and euphoric effects.
- Intrathecal administration requires much smaller doses compared to oral use.
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