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Baclofen is a medication used to treat muscle spasticity, particularly in patients with conditions like spinal cord lesions and multiple sclerosis. Initially designed in 1960 to address epilepsy, baclofen was reintroduced in 1971 for its efficacy in treating muscle spasticity. Baclofen effectively manages spasticity by relieving flexor spasms, clonus, and associated pain. This efficacy has led to baclofen being prescribed for various FDA-approved indications and off-label uses. Understanding the complex pharmacology of baclofen involves reviewing its indications, mechanism of action, administration protocols, associated adverse reactions, contraindications, pharmacokinetics, and monitoring requirements. Healthcare professionals must also consider the FDA-issued box warnings and clinical toxicology before prescribing baclofen. The interprofessional healthcare team is crucial in optimizing treatment plans to minimize adverse effects while meeting individual patient needs. A review of the information in this activity enables healthcare professionals to make informed decisions about baclofen therapy, optimize dosage regimens, and improve patient outcomes in managing conditions associated with muscle spasticity. Objectives: Identify the FDA-approved indications and off-label uses for baclofen therapy. Assess the mechanism of action of baclofen. Identify the potential adverse reactions associated with baclofen administration. Implement effective collaboration and communication among interprofessional team members to improve outcomes and treatment efficacy for patients who might benefit from baclofen therapy. Access free multiple choice questions on this topic.

Signs and Symptoms of Overdose Overdose primarily occurs during screening before pump implantation or human error during pump refilling and programming. Baclofen overdose may cause altered mental status, somnolence, seizure, hypothermia, respiratory depression, and coma. Vomiting, drowsiness, muscular hypotonia, accommodation disorders, coma, respiratory depression, and seizures have been reported in patients with oral intoxication.[41] Management of Overdose In the case of an overdose, the medical staff should empty the pump reservoir, and the patient should receive symptomatic management.[42] Clinicians may consider withdrawing 30 to 40 mL of CSF to reduce baclofen CSF concentration if lumbar puncture is not contraindicated. EEG should be ordered in any patient with a baclofen overdose.[41] When the patient is alert, clinicians may consider vacating the stomach immediately by inducing emesis and then performing lavage. Emesis should not be induced in unconscious patients. Before beginning lavage, the airway is secured with an endotracheal tube. Respiratory stimulants should be avoided. Baclofen is effectively dialyzable due to its low molecular weight, small volume of distribution, and low plasma protein binding. Continuous venovenous hemofiltration (CVVHD) allows for extended toxin removal, improving the clearance of drugs with large volumes of distribution, such as baclofen, more effectively than intermittent hemodialysis.[16] Recommendations

When the patient is alert, clinicians may consider vacating the stomach immediately by inducing emesis and then performing lavage. Emesis should not be induced in unconscious patients. Before beginning lavage, the airway is secured with an endotracheal tube. Respiratory stimulants should be avoided. Baclofen is effectively dialyzable due to its low molecular weight, small volume of distribution, and low plasma protein binding. Continuous venovenous hemofiltration (CVVHD) allows for extended toxin removal, improving the clearance of drugs with large volumes of distribution, such as baclofen, more effectively than intermittent hemodialysis.[16] Recommendations The EXTRIP (Extracorporeal Treatment in Poisoning) workgroup recommends against using extracorporeal treatments (ECTRs) for acute baclofen poisoning due to a lack of clear benefit. However, for baclofen toxicity in patients with impaired kidney function, particularly in cases with coma requiring mechanical ventilation, ECTR should be considered.[43] The American College of Medical Toxicology (ACMT) notes that baclofen overdose can induce coma that may resemble brain death, with coma lasting up to 7 days. ACMT emphasizes the importance of identifying an irreversible cause of brain injury and confirming the presence of drugs through comprehensive history, physical examination, and targeted testing. At least 5 drug half-lives should be observed to ensure adequate clearance before determining brain death in overdose patients. However, relying solely on a drug screen and clearance calculation based on these half-lives may not be sufficient to rule out intoxication in all cases. Additional tests and consultation should be considered for ambiguity cases.[36] Please see StatPearls companion topic, "Baclofen Toxicity," for an in-depth discussion of baclofen toxicity.

Healthcare providers who prescribe baclofen should provide the patient with information on the safe usage of this medication. Baclofen works well as a muscle relaxant, but its use to manage low back pain is limited. The drug should not be combined with narcotics, sedatives, or hypnotics. Also, baclofen should not be prescribed for a prolonged duration. Adult and pediatric neurologists should be consulted for appropriate diagnosis and management in complicated cases. The healthcare team's open communication and collaborative work are essential for effective baclofen therapy. The pharmacist should verify the appropriateness of the dose and mode of administration and perform medication reconciliation to rule out potential drug interactions. In many cases, nurses will administer the drug and should be aware of the signs of adverse effects or excessive dosing. One study evaluated traditional lectures versus micro-videos for teaching baclofen pump programming and refilling to physicians with limited experience. Both methods proved equally effective in improving skills and knowledge retention. Participants favored micro-videos for their convenience and accessibility despite instructor availability and platform navigation concerns.[44] Any concerning information should be brought to the attending physician's attention immediately. In an overdose, emergency medicine physicians should stabilize the patient and secure the airway. Nephrologists should be consulted for dialysis. An interprofessional team approach and communication among clinicians (MD, DO, NP, PA), pharmacists, and nurses are crucial to decreasing potential adverse effects, improving disease course and quality of life, and improving patient outcomes related to baclofen therapy.