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.