@bama921, Yes, spironolactone is a medication also given to animals - https://www.petmd.com/pet-medication/spironolactone. I have been taking it since the late 80's after participating in a Mayo Clinic Rochester heart study for high blood pressure and they determined my high blood pressure was caused by primary aldosteronism.

"Primary Aldosteronism Treatment - For overactivity of both adrenal glands, medication combined with lifestyle modifications can be effective. You might be prescribed the following medications: Spironolactone lowers high blood pressure and helps with low potassium levels."
-- Primary Aldosteronism | Johns Hopkins Medicine
https://www.hopkinsmedicine.org/health/conditions-and-diseases/primary-aldosteronism
My BP fluctuates some also depending on what I am doing. I think it would be a good idea to discuss your concerns with your doctor.