According to Plumbs Veterinary Drug Handbook atenolol in higher dosages may mask symptoms of hyper-t or hypoglycemia; may cause hyper- or hypoglycemia--use with caution in brittle diabetics. Primary adverse effects are lethargy, hypotension, or diarrhea.
Dosage for hypertension:
a) 2 mg/kg once daily; hyperthyroid cats being started on methimazole are treated usually for 2 weeks with atenolol. It is important to closely monitor geriatric cats as renal disease may be a concurrent problem with hyperthyroidism or hypertension.
c) 0.5 mg/kg initially PO q12-24h, may combine with vasodilators and/or diuretics
For indications where beta blockade may be indicated (cardiac, arrhythmias, obstructive heart disease, hypertension, myocardialinfarction, etc):
6.25-12.5 mg (total dose) PO q12-24 h
Client information:
To be effective, the animal must receive all doses as prescribed. Notify veterinarian if animal becomes lethargic or becomes exercise intolerant, develops shortness of breath or cough, or develops a change in behavior or attitude. Do not stop therapy without first conferring with vet.
Drug interactions:
atenolol may prolong the hypoglycemic effects of insulin therapy.
Carly, if you want a copy of the pages from the book which contains more info, PM me your email and I'll scan and make into a PDF and email to you.
