Lioresal Intratecal (Baclofen)

• Lioresal Intratecal (baclofen) is used to manage spasticity by acting on the central nervous system.
• Multiple sclerosis: reduces muscle tone and improves mobility in patients with MS‑related spasticity.
• Spinal cord injury: alleviates stiffness and facilitates functional movement in individuals with post‑injury spasticity.
• Cerebral palsy: decreases involuntary muscle contractions, aiding posture and comfort in affected patients.

• Baclofen is a selective agonist of GABA_B receptors located on pre‑synaptic terminals in the spinal cord. Activation of these metabotropic receptors inhibits calcium influx, reducing release of excitatory neurotransmitters such as glutamate and aspartate. The resulting decrease in neuronal firing lowers alpha‑motor neuron activity, leading to reduced muscle tone and attenuation of spasticity. This effect is dose‑dependent and is achieved when the drug is delivered into the cerebrospinal fluid via intrathecal infusion, allowing high spinal concentrations with minimal systemic exposure.

Baclofen administered intrathecally may be associated with a range of adverse reactions.

Common Side Effects

• Headache: mild to moderate headache occurring after infusion.
• Nausea: transient nausea or upset stomach.
• Drowsiness: increased sleepiness or fatigue.
• Injection site discomfort: pain or irritation at catheter insertion site.
• Dizziness: sensation of lightheadedness or imbalance.
• Muscle weakness: decreased strength in limbs.

Serious or Rare Side Effects

• Respiratory depression: reduced breathing effort requiring monitoring.
• Seizures: rare occurrence of convulsive activity.
• Hypotension: sudden drop in blood pressure.
• Allergic reaction: rash, itching, or anaphylaxis.
• Urinary retention: difficulty emptying bladder.

• When using Lioresal Intratecal, clinicians should observe several precautionary measures to ensure patient safety.
• Dose titration: adjust the infusion rate gradually based on clinical response.
• Monitoring: regularly assess respiratory function and muscle tone during therapy.
• Renal impairment: use caution in patients with reduced kidney function.
• Concomitant CNS depressants: avoid or reduce dose when combined with other sedatives.
• Pregnancy and lactation: safety not established; weigh potential benefits against risks.
• Store at ambient temperature: keep the solution in the original container, protect from light and freeze, and store below 25°C.

Baclofen may interact with other medications, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Opioids: combined use can enhance central nervous system depression and respiratory compromise.
• General anesthetics: may potentiate muscle relaxation and delay recovery of motor function.

Moderate Interactions (Monitor Closely)

• Antihypertensives: baclofen can augment blood‑pressure‑lowering effects, requiring monitoring.
• Anticonvulsants: may require dose adjustments as baclofen can influence seizure threshold.
• Alcohol: concurrent intake may increase sedation and dizziness.