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A plain-language summary of the cited sources below. Informational only — not medical advice.
Baclofen is a muscle relaxant used when someone experiences severe, ongoing muscle stiffness or spasms that haven't responded to other treatments. It works by mimicking a natural chemical in the brain called GABA, which helps calm overactive nerve signals that cause muscles to tighten uncontrollably. The medication is typically prescribed for spasticity linked to spinal cord injury, multiple sclerosis, or other conditions affecting the spinal cord or brain.
The most common side effects your family member may experience are drowsiness, muscle weakness (particularly in the legs), and a general feeling of reduced muscle tone. These effects reflect how the medication works throughout the body, not just in the areas where spasticity is a problem. It's important to watch for these, especially when movement or balance might be affected.
More serious risks require immediate medical attention. Baclofen has been associated with suicidal thoughts and suicide attempts in some people. Seizures can occur, particularly during dose changes or if the medication is stopped suddenly. Overdose can lead to coma. For those receiving baclofen through an implanted pump, equipment failure that interrupts drug delivery can trigger severe withdrawal symptoms, which can be life-threatening. Any sudden worsening of spasticity, confusion, fever, or muscle rigidity should prompt urgent contact with the prescribing doctor.
Baclofen should not be used in people with a known allergy to the medication or those with epilepsy that hasn't responded well to treatment. The prescriber will need to ensure the underlying condition causing spasticity is stable before determining whether ongoing use is appropriate.
Severe chronic spasticity Clinical criteria: Patient must have failed to respond to treatment with oral antispastic agents; OR Patient must have had unacceptable side effects to treatment with oral antispastic agents, AND Patient must have chronic spasticity of cerebral origin.
“Baclofen is an analogue of the inhibitory neurotransmitter gamma- aminobutyric acid (GABA), and may exert its effects by stimulating GABAβ receptors.”
“The elimination half-life in the CSF after single intrathecal bolus injection/short-term infusion of 50 to 136 micrograms baclofen ranges from 1 to 5 hours.”
A plain-language summary of the cited sources below. Informational only — not medical advice.
Baclofen is a centrally acting GABA analogue that stimulates GABAβ receptors. It is approved for severe chronic spasticity of spinal origin (associated with injury, multiple sclerosis, or other spinal cord diseases) or of cerebral origin, specifically in patients unresponsive to oral antispastics, including oral baclofen, or who experience unacceptable side effects at effective oral doses. The condition must be stable for the prescriber to consider the listed maximum quantity suitable.
The elimination half-life following intrathecal administration ranges from 1 to 5 hours. Common adverse effects include drowsiness, somnolence, muscular weakness, hypotonia, and lower-extremity weakness. Serious adverse effects include seizures, suicidal ideation, attempted suicide, coma in overdose, and life-threatening withdrawal symptoms due to drug delivery failure or device malfunction, which has resulted in death. Baclofen is contraindicated in patients with known hypersensitivity to the drug or its excipients, in refractory epilepsy, and must not be administered by intravenous, intramuscular, epidural, or subcutaneous routes.
Working under the parallel aged-care framework? Aged-care equivalent →
Curated subset. The full adverse-effect list is in the TGA Product Information; click any citation above to open it.