Baclofen intrathecal route is described as which combination of effects?

• A. Reduces side effects and delivers higher dosing
• B. Increases systemic toxicity
• C. Requires longer initiation
• D. Decreases efficacy

Answer: (A)

Intrathecal baclofen works by delivering the drug directly into the cerebrospinal fluid around the spinal cord, usually via an implanted pump. This targets the spinal GABA-B receptors with much higher local concentrations while keeping overall systemic exposure very low. The result is a significant reduction in spasticity with far fewer systemic side effects, which in turn allows for higher dosing than is feasible with oral therapy. That combination—fewer systemic effects and the ability to dose higher—best captures the description of this route. Increased systemic toxicity, longer initiation, or decreased efficacy do not fit, since the intrathecal approach minimizes systemic exposure, can be titrated to effect without an inherently longer start, and generally improves control of spasticity.