Information extract from Plumb’s, fifth edition:

  • Atenolol is a beta-blocker that is often used in small animals for hypertension and tachyarrhythmias
  • It has minimal beta-2 activity at common doses
  • Atenolol is contraindicated in patients with bradycardic arrhythmias or those hypersensitive to it
  • Negative inotrope, so must be used with caution in CHF, renal failure and sinus node dysfunction
  • Higher doses may mask symptoms of hyperthyroidism or hypoglycaemia
  • Side effects include lethargy, hypotension or diarrhoea
  • Withdraw gradually when discontinuing therapy Prescription is required for this medication.