Propranolol for essential tremor

Propranolol reduces tremor in about half of people who take it, but the evidence is old, small, and funded by nobody with a stake in the drug's failure.

The best evidence for propranolol in essential tremor comes from a handful of small trials from the 1980s and a 2025 network meta-analysis that pooled 33 RCTs with 1,251 patients total [8]. That meta-analysis found propranolol produces substantial tremor reduction, but the authors rated the overall certainty as low to very low because the individual studies were small, used different outcome scales, and rarely followed patients past a year [8]. The 1989 Neurology study of 50 patients showed clinical scores dropping from about 2.4 at baseline to 1.2 at one month, but the benefit partly faded by six months [4]. A 1987 study comparing propranolol to primidone found both worked but primidone was more effective in the short term [1]. Neither study was funded by a manufacturer, which is unusual and actually strengthens the evidence slightly, but the sample sizes are too small to trust the numbers.

The mechanism is plausible: propranolol blocks beta-adrenergic receptors that amplify tremor signals through the cerebellum-thalamus-cortex loop [7]. A 2020 study of 38 patients found that 8 weeks of propranolol at 40 mg twice daily reduced SLC1A2 gene expression, a glutamate transporter gene, and lowered tremor scores from 2.7 to 2.1 on the Fahn-Tolosa-Marin scale [3]. That is a real biochemical change, but the clinical improvement was modest and the study was not randomized.

What is missing: no long-term safety data beyond 12 months, no head-to-head trial against modern alternatives like topiramate or deep brain stimulation with adequate power, and no study that tracks all-cause outcomes instead of just tremor scores. The BMJ review from 2019 notes that propranolol is first-line but that head and voice tremor show limited chronic response [6]. About half of patients respond to alcohol, and those same patients tend to respond to propranolol, which suggests the drug works for a subtype, not everyone [6].

My call: propranolol reduces essential tremor in roughly half of patients, with modest effect that may wane over months, and the evidence base is too small and short to call it safe or effective in any strong sense. Confidence: low.