A dual timeline of safinamide effects in Parkinson's disease: mechanistic rationale and clinical implications.

Research overview

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Safinamide is a selective, reversible monoamine oxidase type B inhibitor (MAO-B inhibitor) used as an adjunct to oral levodopa in patients with Parkinson's disease (PD) experiencing motor fluctuations. Unlike other MAO-B inhibitors, safinamide possesses a dual mechanism of action, combining dopaminergic enhancement through MAO-B inhibition with modulation of abnormal glutamatergic transmission. In clinical practice, safinamide is primarily recognized for its ability to reduce motor fluctuations. However, its pharmacological profile suggests a broader therapeutic potential beyond dopaminergic modulation alone. Randomized controlled trials have shown that safinamide increases daily ON time without worsening troublesome dyskinesia. Nevertheless, reported effects on dyskinesia have generally been modest and inconsistent across studies. Clinical observations from longer-term follow-up and real-world studies suggest that improvements in dyskinesia and certain non-motor symptoms may emerge more gradually than the early motor benefits. Based on this observed pattern, it can be hypothesized that safinamide may exhibit a dual timeline of clinical effects, with early dopaminergic improvements in motor ON time followed by later modulation of dyskinesia and selected non-motor symptoms potentially mediated through glutamatergic mechanisms. On the basis of these pharmacological characteristics and clinical observations, a phenotype-oriented approach to patient selection for safinamide therapy may be considered. In addition, recognizing the potential for a dual timeline of therapeutic effects may help clinicians guide patients' expectations of treatment and interpret treatment response, as well as optimizing follow-up strategies in routine clinical practice.

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