Atenolol vs. propranolol in essential tremor. A controlled, quantitative study

Area of Science:

• Pharmacology
• Neurology
• Cardiology

Background:

• Essential tremor is a common neurological disorder.
• Beta-blockers are frequently used to manage essential tremor.
• Atenolol is a beta-1 selective, hydrophilic beta-blocker, while propranolol is non-selective and lipid-soluble.

Purpose of the Study:

• To compare the efficacy and tolerability of atenolol versus propranolol in patients with essential tremor.
• To evaluate the effects of these beta-blockers on tremor intensity, frequency, and heart rate.

Main Methods:

• A double-blind, cross-over study was conducted.
• Twenty-four patients with essential tremor participated.
• Treatments included atenolol (100 mg daily), propranolol (240 mg daily), and placebo.

Main Results:

• Both atenolol and propranolol significantly reduced tremor intensity compared to placebo.
• There was no significant difference in tremor suppression between atenolol and propranolol.
• Both drugs similarly decreased heart rate but did not affect tremor frequency.
• Patient preference favored propranolol, though no marked side-effects were observed.

Conclusions:

• Atenolol is a viable alternative for essential tremor management, particularly for patients intolerant to non-selective beta-blockers.
• Cardio-selective beta-blockers may offer an alternative treatment option.
• Further research is needed to determine the exact site of action and receptor subtypes involved.