Metoclopramide (Reglan) Dosage Calculator for Dogs

Metoclopramide (Reglan) for Dogs – Antiemetic + Prokinetic

Metoclopramide is a dopamine D2 antagonist + 5-HT4 agonist providing both antiemetic AND prokinetic effects in dogs. Best for prokinetic indications (megaesophagus, reflux, ileus).

Standard Dose

0.2-0.5 mg/kg PO/SC/IM every 6-8 hours

CRI (refractory): 1-2 mg/kg/24 hours IV

Dose Reference Table (0.3 mg/kg)

Weight	Per Dose	Tablets (10 mg)
5 kg	1.5 mg	1/8 tab
10 kg	3 mg	1/4 tab
15 kg	4.5 mg	~1/2 tab
20 kg	6 mg	~1/2 tab
30 kg	9 mg	~1 tab
40 kg	12 mg	~1 tab

⏰ Critical Timing

Give 30 MINUTES BEFORE meals for prokinetic effect.

Mechanism

• D2 antagonist at chemoreceptor trigger zone (antiemetic)
• 5-HT4 agonist (prokinetic)
• 5-HT3 antagonist at high doses (additional antiemetic)
• Increases lower esophageal sphincter tone
• Enhances gastric + intestinal motility
• Crosses blood-brain barrier (CNS side effects possible)

Metoclopramide vs Maropitant (Cerenia)

Feature	Metoclopramide	Maropitant (Cerenia)
Class	D2 antagonist	NK1 antagonist
Antiemetic	Moderate	SUPERIOR
Prokinetic	YES	NO
Dosing	q6-8h	q24h
Cost	Inexpensive	More expensive
Side effects	Extrapyramidal possible	Better tolerated
Best for	Prokinetic indications	Vomiting alone

For vomiting alone: Maropitant (Cerenia) usually preferred.

For prokinetic + antiemetic: Metoclopramide retains value.

Can combine for severe cases.

Indications

Indication	Use
Megaesophagus	LIFELONG prokinetic + bailey chair feeding
Reflux (GERD)	LES tone + gastric emptying
Ileus / gastric stasis	Post-surgical, post-parvo
Acute vomiting	Cerenia often preferred
Chemo emesis	Pre + post-chemo

Side Effects

Common

• Restlessness / hyperactivity / agitation (dogs > humans)
• Mild lethargy (paradoxical)
• Constipation occasional

Uncommon

• EXTRAPYRAMIDAL signs – tremors, dystonia
• Depression
• Behavioral changes

Treatment for Extrapyramidal Signs

• DIPHENHYDRAMINE 2-4 mg/kg as antidote
• Discontinue metoclopramide
• Usually reversible

⚠ Contraindications

• GI OBSTRUCTION (rule out first – radiographs)
• GI hemorrhage
• Perforation
• Pheochromocytoma
• MAOI (selegiline/Anipryl) – hypertensive crisis
• Seizure disorder (caution)

Drug Interactions

• MAOIs – hypertensive crisis
• Anticholinergics – reduce effect
• Opioids – counter prokinetic
• SSRIs – additive serotonergic
• Cyclosporine – increases levels
• Digoxin – reduces absorption

Frequently Asked Questions

How much metoclopramide should I give my dog?

STANDARD DOSE: 0.2-0.5 mg/kg PO/SC/IM every 6-8 hours, GIVEN 30 MINUTES BEFORE MEALS. CRI for severe: 1-2 mg/kg/24 hours IV (hospital). EXAMPLES at 0.3 mg/kg: 1) 5 kg = 1.5 mg; 2) 10 kg = 3 mg; 3) 15 kg = 4.5 mg; 4) 20 kg = 6 mg; 5) 30 kg = 9 mg; 6) 40 kg = 12 mg. FORMULATIONS: 10 mg tablets (most common), 5 mg tablets, 1 mg/mL liquid compounded for small dogs, 5 mg/mL injectable. INDICATION-SPECIFIC: 1) Vomiting – 0.2-0.5 mg/kg q6-8h (Cerenia often preferred); 2) Megaesophagus – 0.2-0.5 mg/kg TID 30 min before meals (lifelong); 3) Reflux – 0.2-0.5 mg/kg q8h; 4) Ileus/stasis – 0.3-0.5 mg/kg q6-8h; 5) Chemo emesis – 0.3-0.5 mg/kg q6h. CRITICAL TIMING: 30 minutes BEFORE meals for prokinetic effect. CONSIDER MAROPITANT (CERENIA) FIRST for vomiting alone – superior antiemetic, once-daily dosing, better tolerated. Metoclopramide best when PROKINETIC effect needed (megaesophagus, reflux, ileus). Can combine for severe cases.

When is metoclopramide better than Cerenia (maropitant)?

METOCLOPRAMIDE better for PROKINETIC indications. CERENIA (maropitant) better for VOMITING alone. WHEN METOCLOPRAMIDE PREFERRED: 1) MEGAESOPHAGUS – prokinetic improves gastric emptying; Cerenia has NO prokinetic effect; lifelong management; 2) GASTROESOPHAGEAL REFLUX (GERD) – increases lower esophageal sphincter tone + enhances gastric emptying = reduces reflux events; Cerenia doesn’t address mechanically; 3) ILEUS / GASTRIC STASIS – prokinetic resolves stasis; post-surgical, post-parvo, post-trauma; 4) DELAYED GASTRIC EMPTYING – functional or anatomic; prokinetic helps; 5) Combination needed – both antiemetic + prokinetic effects; 6) Cost-sensitive – metoclopramide cheaper. WHEN CERENIA PREFERRED: 1) ACUTE VOMITING any cause – superior antiemetic; 2) CHEMOTHERAPY EMESIS – broad-spectrum; 3) MOTION SICKNESS – excellent efficacy; 4) ONCE-DAILY dosing preference; 5) Side effect-sensitive dogs – no extrapyramidal effects; 6) Pregnant/lactating – safer profile; 7) Severe vomiting refractory to other agents. CAN BE COMBINED: 1) SEVERE refractory vomiting + prokinetic needed; 2) Different mechanisms = additive benefit; 3) Hospital intensive care setting; 4) Megaesophagus with vomiting; 5) Cerenia for vomiting + metoclopramide for prokinetic; 6) Increased side effect monitoring needed. OTHER ANTIEMETIC OPTIONS: 1) ONDANSETRON (Zofran) – 5-HT3 antagonist – excellent for refractory; 0.5-1 mg/kg PO/IV q8-12h; 2) DOLASETRON – similar to ondansetron; 3) BUTORPHANOL – opioid; mild antiemetic; sedating; 4) DIPHENHYDRAMINE – mild antiemetic + sedative; for motion sickness; 5) CHLORPROMAZINE – phenothiazine; rarely used now; 6) PROCHLORPERAZINE – phenothiazine. PROKINETIC ALTERNATIVES: 1) CISAPRIDE – withdrawn in humans; veterinary compounded; stronger prokinetic than metoclopramide; not commonly used now; 2) ERYTHROMYCIN – prokinetic effect as antibiotic; 0.5-1 mg/kg q8h; 3) RANITIDINE – mild prokinetic + acid reducer (historical); 4) DOMPERIDONE – similar to metoclopramide; less CNS effect; veterinary use limited. PRACTICAL APPROACH: 1) Vomiting alone – START with Cerenia; 2) Vomiting + prokinetic needed – metoclopramide or combine; 3) Megaesophagus – metoclopramide first-line; 4) Refractory vomiting – combine with ondansetron; 5) Hospital-level severe – multimodal approach; 6) Cost consideration – metoclopramide often appropriate. CONSULT VETERINARIAN for personalized recommendation.

What are metoclopramide side effects in dogs?

GI side effects + CNS effects (extrapyramidal). Dogs more sensitive than humans. COMMON: 1) RESTLESSNESS / HYPERACTIVITY / AGITATION – more common in dogs than humans; classic side effect; sometimes severe; reduce dose or discontinue; 2) Mild lethargy (paradoxical in some); 3) Constipation occasional; 4) Diarrhea less common; 5) Decreased appetite. UNCOMMON: 1) EXTRAPYRAMIDAL SIGNS – INVOLUNTARY MOVEMENTS: a) Tremors; b) Dystonia (sustained muscle contractions); c) Akathisia (motor restlessness); d) Bruxism (teeth grinding); e) Tongue protrusion; f) Reversible with discontinuation; g) ANTIDOTE: DIPHENHYDRAMINE 2-4 mg/kg IV/IM; 2) DEPRESSION; 3) Behavioral changes; 4) Mydriasis (dilated pupils); 5) Hypertension; 6) Tachycardia. RARE: 1) Severe extrapyramidal reactions; 2) NEUROLEPTIC MALIGNANT SYNDROME – hyperthermia, muscle rigidity, autonomic instability (very rare); 3) Methemoglobinemia; 4) Severe allergic reactions; 5) Tardive dyskinesia (chronic use, rare). DOSE-RELATED side effects: 1) Higher doses = more CNS effects; 2) IV/rapid IV more side effects than slow IV/PO; 3) Reduce dose if signs appear; 4) Some dogs sensitive even at low doses. MANAGEMENT: 1) RESTLESSNESS/agitation: a) Reduce dose 25-50%; b) Spread doses out; c) Discontinue if severe; d) Quiet environment; 2) EXTRAPYRAMIDAL signs: a) Discontinue immediately; b) Diphenhydramine 2-4 mg/kg as antidote; c) Supportive care; d) Usually reversible in 24-48 hours; 3) DEPRESSION/lethargy: a) Reduce dose; b) Discontinue if severe; c) Address underlying cause. CONTRAINDICATIONS: 1) GI OBSTRUCTION – critical; prokinetic against obstruction = perforation risk; rule out radiographs first; 2) GI HEMORRHAGE; 3) GI PERFORATION; 4) PHEOCHROMOCYTOMA – hypertensive crisis; 5) MAO INHIBITORS (selegiline/Anipryl) – hypertensive crisis; 6) SEIZURE DISORDER – lowers threshold; 7) HYPERSENSITIVITY. CAUTIONS: 1) EPILEPSY – monitor; 2) PREGNANCY/lactation – limited data; 3) HEPATIC DISEASE – reduce dose; 4) RENAL DISEASE – reduce dose; 5) ELDERLY dogs – more sensitive. DRUG INTERACTIONS: 1) MAOIs – HYPERTENSIVE CRISIS risk; 2) ANTICHOLINERGICS – reduce prokinetic effect; 3) OPIOIDS – counter prokinetic; 4) SSRIs – additive serotonergic; 5) CYCLOSPORINE – increases cyclosporine levels; 6) DIGOXIN – reduces digoxin absorption; 7) SEDATIVES – additive CNS depression; 8) APOMORPHINE – antagonized by metoclopramide; 9) LEVODOPA – reduces effect. MONITORING: 1) Initial dose – observe for 1-2 hours; 2) Watch for CNS signs; 3) Document side effects; 4) Periodic reassessment; 5) Bloodwork if chronic use. WHEN TO STOP: 1) Severe extrapyramidal signs; 2) Severe restlessness affecting quality of life; 3) GI obstruction develops; 4) Allergic reaction; 5) Cardiovascular effects; 6) No clinical benefit. EXCELLENT EFFICACY when tolerated. Choose maropitant (Cerenia) for vomiting alone if side effects problematic.

Can I give my dog metoclopramide for megaesophagus?

YES – metoclopramide is a CORNERSTONE of megaesophagus management. WHY METOCLOPRAMIDE WORKS for MEGAESOPHAGUS: 1) Megaesophagus = dilated esophagus with impaired motility; 2) Food accumulates → regurgitation → aspiration risk; 3) Prokinetic helps move food past lower esophageal sphincter; 4) Improves gastric emptying; 5) Reduces regurgitation; 6) Reduces aspiration pneumonia risk. DOSING for MEGAESOPHAGUS: 1) 0.2-0.5 mg/kg PO every 8 hours (TID); 2) GIVE 30 MINUTES BEFORE EACH MEAL – critical timing; 3) Lifelong management; 4) Adjust based on response. MULTIMODAL MEGAESOPHAGUS MANAGEMENT: 1) BAILEY CHAIR – feeding upright position 10-20 minutes after meals; gravity assists food passage; ESSENTIAL component; 2) MEATBALLS / SMALL FREQUENT MEALS (4-6/day) – easier to pass than large meals; 3) HIGH-CALORIE DENSITY foods – reduce volume needed; 4) FLUID CONSISTENCY varies by dog – some do better with slurry, others meatballs; 5) METOCLOPRAMIDE – prokinetic; 6) SUCRALFATE – protects esophageal mucosa from regurgitation; 7) OMEPRAZOLE / FAMOTIDINE – acid suppression; 8) Treat underlying cause if identified: a) MYASTHENIA GRAVIS – acetylcholinesterase test (Tensilon); pyridostigmine treatment; b) HYPOTHYROIDISM – thyroid testing; levothyroxine; c) ADDISON’S DISEASE – ACTH stim; supplementation; d) Toxin exposure; e) Other neuromuscular conditions. PREDISPOSED BREEDS: 1) Great Dane; 2) German Shepherd Dog; 3) Newfoundland; 4) Irish Setter; 5) Miniature Schnauzer; 6) Wire-haired Fox Terrier; 7) Many breeds possible. ASPIRATION PNEUMONIA – major complication: 1) Most common cause of death in megaesophagus dogs; 2) Vigilance critical; 3) Vaccinate against Bordetella; 4) Prompt antibiotic treatment for any respiratory signs; 5) Cerenia adjunct for nausea; 6) Reduce aspiration risk with feeding management. ALTERNATIVE PROKINETICS: 1) CISAPRIDE – stronger prokinetic; compounded; not commonly available; 2) BETHANECHOL – cholinergic agonist; can be combined with metoclopramide; 3) ERYTHROMYCIN – antibiotic with prokinetic effect; 0.5-1 mg/kg q8h; cycling with metoclopramide possible; 4) MOSAPRIDE – 5-HT4 agonist; less common. PROGNOSIS: 1) Variable; 2) Congenital – some improve as puppy matures; 3) Acquired – depends on underlying cause; 4) Quality of life management; 5) Dedicated owner can have years of good quality life; 6) Aspiration pneumonia main complication; 7) Bailey chair + medications + dietary management = best outcomes. WORK WITH VETERINARIAN OR INTERNAL MEDICINE SPECIALIST for proper diagnosis (chest X-rays, esophagram), treatment, and ongoing management.

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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 – metoclopramide.
2. Washabau RJ, Hall JA. Diagnosis and management of gastrointestinal motility disorders.
3. AAHA Anesthesia Guidelines.
4. Boscan P et al. Effect of maropitant.
5. Encarnacion HJ et al. Megaesophagus.
6. Ettinger SJ, Feldman EC. Textbook of Veterinary Internal Medicine.
7. PuppaDogs. Cerenia Calculator, Vomiting Triage, Megaesophagus Calculator. puppadogs.com.