Table 7.

Oral antihypertensive agents

Class	Drug	Usual oral dosage
Angiotensin converting enzyme inhibitor	Benazepril	D: 0.5 mg/kg q12‐24h
		C: 0.5 mg/kg q12h
	Enalapril	D: 0.5 mg/kg q12‐24h
		C: 0.5 mg/kg q24h
Angiotensin receptor blocker	Telmisartan	C: 1 mg/kg q24h
		D: 1 mg/kg q24h
Calcium channel blocker	Amlodipine	D/C: 0.1‐0.25 mg/kg q24h
		(up to 0.5 mg/kg in cats and dogs)
		C: 0.625‐1.25 mg per cat q24h
α1 blocker	Prazosin	D: 0.5‐2 mg/kg q8‐12h C: 0.25‐0.5 mg/cat q24h
	Phenoxybenzamine	D: 0.25 mg/kg q8‐12h or 0.5 mg/kg q24h
		C: 2.5 mg per cat q8‐12h or 0.5 mg/cat q24h
	Acepromazine	D/C: 0.5‐2 mg/kg q8h
Direct vasodilator	Hydralazine	D: 0.5‐2 mg/kg q12h
		(start at low end of range)
		C: 2.5 mg/cat q12‐24h
Aldosterone antagonist	Spironolactone	D/C: 1.0‐2.0 mg/kg q12h
β blocker	Propranolol	D: 0.2‐1.0 mg/kg q8h
		(titrate to effect)
		C: 2.5‐5 mg/cat q8h
	Atenolol	D: 0.25‐1.0 mg/kg q12h
		C: 6.25‐12.5 mg/cat q12h
Thiazide diuretic	Hydrochlorothiazide	D/C: 2‐4 mg/kg q12‐24h
Loop diuretic	Furosemide	D/C: 1‐4 mg/kg q8‐24h

C, cat; D, dog.