Enalapril Dosage Calculator for Dogs (ACE-Inhibitor)

Enalapril for Dogs – ACE-Inhibitor for CHF + Hypertension

Enalapril is an ACE-inhibitor used for congestive heart failure, systemic hypertension, CKD with proteinuria, and DCM in dogs.

Standard Dose

0.25-0.5 mg/kg PO every 12-24 hours

CHF often dosed BID. Hypertension often dosed daily.

Dose Reference Table (0.5 mg/kg q12h)

Weight	Per Dose	Tablets (5 mg)
5 kg	2.5 mg	1/2 tab BID
10 kg	5 mg	1 tab BID
15 kg	7.5 mg	1.5 tabs BID
20 kg	10 mg	2 tabs BID
30 kg	15 mg	3 tabs BID
40 kg	20 mg	4 tabs BID

Brand names: Enacard (vet), Vasotec (human), generic widely available.

Enalapril vs Benazepril

Feature	Enalapril	Benazepril
Elimination	Primarily renal	Dual hepatic + renal
CKD considerations	Accumulates	PREFERRED
Half-life	~10-15 hours	~22 hours
Dosing	Often BID for CHF	Often once-daily
Cost	Slightly cheaper	Competitive

Benazepril preferred in dogs with significant CKD. Both effective.

Renal Dose Adjustments

Renal Status	Adjustment
Normal	Standard dose
IRIS 2 (mild CKD)	Cautious; monitor
IRIS 3 (moderate)	75% dose
IRIS 4 (severe)	50% dose or switch to benazepril
AKI	Contraindicated

Standard CHF Quad Therapy

Drug	Dose	Role
Furosemide	1-3 mg/kg q8-12h	Diuretic
Pimobendan	0.25 mg/kg q12h	Inodilator
Enalapril	0.25-0.5 mg/kg q12-24h	RAAS blockade
Spironolactone	2 mg/kg q24h	K+-sparing

⚠ Triple Whammy

ACE-i + Diuretic + NSAID = AKI risk

AVOID NSAIDs in dogs on enalapril + furosemide.

Use instead: Gabapentin, Librela, Adequan, omega-3.

Contraindications

• Severe dehydration
• Hypotension (SBP <90)
• Severe hyperkalemia (K >6.0)
• AKI
• Bilateral renal artery stenosis
• Pregnancy – teratogenic
• Hypersensitivity

Drug Interactions

• NSAIDs – triple whammy
• K+ supplements – hyperkalemia
• K+-sparing diuretics high-dose
• Furosemide – standard CHF combo (monitor)
• Lithium – rare

Side Effects

Uncommon

• Decreased appetite
• GI upset
• Hyperkalemia
• Mild azotemia
• Hypotension

Rare

• Cough (rare in dogs unlike humans)
• Angioedema
• Renal failure (with NSAID)

Monitoring

• Baseline: BUN, Cr, Na, K, Cl, UPC, BP
• 5-7 days after starting
• 2-4 weeks initially
• Every 3-6 months stable

Expected: BUN/Cr 10-25% increase acceptable; K+ may rise modestly; UPC target 50% reduction.

Frequently Asked Questions

How much enalapril should I give my dog?

STANDARD DOSE: 0.25-0.5 mg/kg PO every 12-24 hours

CHF typically BID; hypertension often daily. EXAMPLES (0.5 mg/kg q12h):

1. 5 kg = 2.5 mg BID
2. 10 kg = 5 mg BID
3. 15 kg = 7.5 mg BID
4. 20 kg = 10 mg BID
5. 30 kg = 15 mg BID
6. 40 kg = 20 mg BID

FORMULATIONS: 2.5, 5, 10, 20 mg tablets – splittable. Brands: Enacard (veterinary), Vasotec (human), generic

ADMINISTRATION:

1. With or without food
2. Same time daily
3. BID dose every 12 hours
4. Don’t miss doses
5. Consistent schedule

RENAL ADJUSTMENTS:

1. Normal – standard
2. IRIS 2 – cautious monitoring
3. IRIS 3 – 75% dose
4. IRIS 4 – 50% dose OR SWITCH TO BENAZEPRIL (preferred in CKD due to dual elimination)
5. AKI – contraindicated

STANDARD CHF QUAD THERAPY: furosemide + pimobendan + enalapril + spironolactone. WORK WITH VETERINARIAN for appropriate dose + monitoring

Enalapril vs benazepril for dogs – which is better?

DEPENDS on individual dog’s renal function

BENAZEPRIL preferred for CKD. Both effective for CHF. KEY DIFFERENCES:

1. ELIMINATION: a) ENALAPRIL primarily renal – accumulates in CKD; b) BENAZEPRIL dual hepatic + renal – safer in CKD
2. HALF-LIFE: a) Enalapril ~10-15 hours; b) Benazepril ~22 hours
3. DOSING FREQUENCY: a) Enalapril often BID for CHF (especially severe); b) Benazepril typically once-daily
4. DOSE: BOTH 0.25-0.5 mg/kg
5. BIOAVAILABILITY: a) Enalapril ~60% absolute; b) Benazepril ~37% absolute
6. BRANDS: a) ENALAPRIL = Enacard (vet), Vasotec (human); b) BENAZEPRIL = Fortekor (vet), Lotensin (human)
7. COST: ENALAPRIL slightly cheaper typically; BENAZEPRIL competitive especially generic

WHEN TO CHOOSE ENALAPRIL:

1. Normal renal function
2. CHF without significant CKD
3. Cost-sensitive owner
4. Historical use
5. Generic availability
6. Familiarity

WHEN TO CHOOSE BENAZEPRIL:

1. CKD especially moderate-severe (IRIS 3-4)
2. Need once-daily dosing for compliance
3. Preferred in CKD per guidelines
4. Hepatic disease less concerning
5. Standard veterinary CHF protocols

SWITCHING BETWEEN:

1. Direct switch generally safe
2. Dose-equivalent transition (both 0.25-0.5 mg/kg)
3. Reassess in 1-2 weeks after switch
4. Monitor labs

OTHER ACE-i USED in dogs:

1. IMIDAPRIL (Prilium) – veterinary specific in Europe
2. RAMIPRIL – dual elimination similar to benazepril
3. CAPTOPRIL – rarely used now
4. LISINOPRIL – human drug; not commonly used in dogs (less data)

EFFICACY SIMILAR:

1. Both effective for CHF
2. Both reduce proteinuria in CKD
3. Both reduce hypertension modestly
4. Both used per IRIS guidelines
5. Choice based on practical considerations. CONSULT VETERINARIAN for individualized recommendation

Can I give my dog enalapril and Rimadyl together?

AVOID – significant TRIPLE WHAMMY risk if also on diuretic. WHY DANGEROUS:

1. ENALAPRIL (ACE-i) reduces glomerular filtration pressure
2. DIURETICS (furosemide) cause volume depletion
3. NSAIDs inhibit renal prostaglandins
4. ALL THREE TOGETHER = AKI risk significantly increased
5. Common scenario: older dog with CHF + arthritis
6. Each medication alone usually OK; combination problematic

RISK FACTORS for severe interaction:

1. Older age
2. Pre-existing CKD
3. Dehydration
4. High furosemide doses
5. Long-term concurrent use
6. Hypovolemia
7. Concurrent illness

NSAIDs to AVOID:

1. Carprofen (Rimadyl, Novox)
2. Meloxicam (Metacam)
3. Firocoxib (Previcox)
4. Robenacoxib (Onsior)
5. Deracoxib (Deramaxx)
6. Grapiprant (Galliprant) – caution
7. Aspirin
8. Human NSAIDs

SAFER PAIN ALTERNATIVES for CHF dog:

1. GABAPENTIN 10-20 mg/kg q8-12h – no renal/GI effects
2. LIBRELA (bedinvetmab) – monthly anti-NGF injection; SAFE for cardiac/renal patients; excellent option
3. ADEQUAN injections
4. OMEGA-3 fish oil
5. Glucosamine/chondroitin supplements
6. Acupuncture
7. Laser therapy
8. Physical therapy
9. Weight management
10. Amantadine
11. Maropitant
12. Therapeutic diets (Hill’s j/d, Royal Canin Mobility)

AKI WARNING SIGNS:

1. Decreased appetite
2. Vomiting
3. Lethargy
4. Decreased urine output
5. Increased BUN/Cr
6. Decreased urine specific gravity
7. Tremors, weakness
8. Collapse

ACTION: STOP NSAID immediately + emergency vet

IF NSAID ABSOLUTELY NECESSARY:

1. Vet decision with informed consent
2. Lowest effective dose
3. Shortest duration
4. Weekly bloodwork initially
5. Monitor BP
6. Ensure hydration
7. Watch AKI signs
8. PPI for GI protection
9. Stop at first sign of trouble

BOTTOM LINE: Use non-NSAID multimodal pain management for dogs on enalapril + furosemide

Does enalapril cause cough in dogs like in humans?

RARE in dogs – cough is much less common ACE-i side effect in dogs vs humans. New cough on enalapril usually due to OTHER cause (CHF worsening more likely)

HUMANS – ACE-i COUGH:

1. 10-20% incidence in humans
2. Persistent DRY cough
3. Worse at night
4. Bradykinin-mediated
5. Resolves with discontinuation
6. Common reason for switching to ARB

DOGS – COUGH RARE:

1. Different bradykinin receptor distribution
2. Less bradykinin-mediated cough response
3. Species variation
4. Rarely reported with enalapril in dogs
5. Always investigate other causes first

IF DOG ON ENALAPRIL DEVELOPS COUGH – investigate:

1. CHF DECOMPENSATION (most common cause) – pulmonary edema returning; check sleeping respiratory rate; chest X-rays
2. CHRONIC BRONCHITIS – common in older small breeds
3. TRACHEAL COLLAPSE – small breeds
4. HEARTWORM disease
5. PNEUMONIA
6. NEOPLASIA – older dogs
7. LARYNGEAL PARALYSIS – older large breeds
8. FOREIGN BODY
9. Allergic component
10. Kennel cough

WORKUP:

1. Sleeping respiratory rate (over 30/min sustained = CHF)
2. Chest X-rays – rule out pulmonary edema, mass, pneumonia
3. Echocardiogram if CHF progression suspected
4. Heartworm test
5. CBC + chemistry
6. Possibly tracheoscopy if chronic

WHEN ACE-i COUGH SUSPECTED in dog (after excluding others):

1. Started shortly after ACE-i
2. Dry non-productive cough
3. No CHF signs
4. Otherwise stable
5. Other causes ruled out

MANAGEMENT IF CONFIRMED:

1. Discontinue enalapril
2. Switch to ARB (TELMISARTAN, LOSARTAN) – similar effect, no bradykinin
3. Telmisartan 1 mg/kg PO q24h
4. Continue CHF management
5. Monitor response

ARB ALTERNATIVES:

1. TELMISARTAN (Semintra cat-labeled, off-label dogs) – 1 mg/kg q24h
2. LOSARTAN less common
3. Similar RAAS blockade
4. No bradykinin effect
5. No cough. COMMUNICATE WITH VET about any new cough on enalapril. Don’t assume it’s the medication. Proper workup essential. Most coughs in CHF dogs are NOT from enalapril

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References & Further Reading

The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.

1. Plumb DC. Plumb’s Veterinary Drug Handbook – enalapril.
2. Keene BW et al. ACVIM consensus guidelines for MVD. JVIM 2019.
3. COVE Study Group. Controlled clinical evaluation of enalapril in dogs with CHF.
4. IMPROVE Study Group. Acute and short-term hemodynamic effects of enalapril.
5. Atkins C et al. ACE-inhibitors in canine cardiology.
6. Ettinger SJ, Feldman EC. Textbook of Veterinary Internal Medicine.
7. PuppaDogs. Benazepril Calculator, Furosemide Calculator, MVD ACVIM Stage Calculator. puppadogs.com.