Side Effects of Galliprant in Dogs: What Every Owner Should Know
Learn about the side effects of Galliprant in dogs.
If your dog has been diagnosed with osteoarthritis and prescribed Galliprant (grapiprant), you likely have questions about what to expect. Galliprant is a non-steroidal anti-inflammatory drug (NSAID) specifically designed for dogs, but like all medications, it carries potential side effects that range from mild and self-limiting to serious enough to warrant immediate veterinary attention. Understanding the side effects of Galliprant in dogs is essential for monitoring your pet's comfort and safety throughout treatment.
Galliprant works differently from traditional NSAIDs like carprofen or meloxicam. Instead of blocking cyclooxygenase (COX) enzymes broadly, it targets the prostaglandin E2 (PGE2) EP4 receptor — the specific pathway most responsible for pain and inflammation in osteoarthritic joints. This targeted mechanism was designed to reduce the gastrointestinal, renal, and hepatic side effects commonly associated with conventional NSAIDs. However, "reduced risk" does not mean "zero risk," and adverse reactions still occur in a measurable percentage of treated dogs.
According to the FDA's Center for Veterinary Medicine, Galliprant was approved in 2016 for the control of pain and inflammation associated with osteoarthritis in dogs. It is manufactured by Elanco (originally Aratana Therapeutics) and sold under the brand name Galliprant. The medication is available in 20 mg, 60 mg, and 100 mg scored tablets, dosed at approximately 2 mg/kg (0.91 mg/lb) once daily.
What Is Galliprant and How Does It Work in Dogs?
Galliprant (grapiprant) is a prescription NSAID classified as an EP4 receptor antagonist. In a dog's body, prostaglandin E2 binds to four different receptors (EP1 through EP4). The EP4 receptor is the primary mediator of PGE2-induced pain and inflammation in arthritic tissue. By selectively blocking only this receptor, Galliprant aims to provide analgesic and anti-inflammatory effects without suppressing the protective prostaglandins that maintain gastric mucosal integrity, renal blood flow, and platelet function.
This mechanism is fundamentally different from non-selective COX inhibitors (like aspirin or piroxicam) and even COX-2 selective inhibitors (like carprofen or deracoxib). The Merck Veterinary Manual notes that traditional NSAIDs carry well-documented risks of gastric ulceration, renal toxicity, and hepatotoxicity — risks that Galliprant's targeted approach was specifically engineered to minimize.
Galliprant is indicated for dogs weighing at least 8 pounds (3.6 kg) and is not approved for use in cats. It should not be used in dogs with known hypersensitivity to grapiprant, and its safety has not been established in pregnant, lactating, or breeding dogs, or in dogs younger than 9 months of age.
Common Side Effects of Galliprant in Dogs
In the pivotal field study submitted to the FDA for drug approval, researchers tracked adverse events across hundreds of dogs receiving Galliprant over a 28-day period. The most frequently reported side effects were gastrointestinal in nature. Here is a breakdown organized by severity:
| Severity Level | Side Effect | Reported Frequency | Typical Onset |
|---|---|---|---|
| Mild (most common) | Vomiting | ~11% of treated dogs | Within first 1–2 weeks |
| Mild | Diarrhea / soft stools | ~8% of treated dogs | Within first 1–2 weeks |
| Mild | Decreased appetite | ~5% of treated dogs | Within first 1–2 weeks |
| Mild to Moderate | Lethargy / decreased activity | ~3% of treated dogs | Variable, often early treatment |
| Moderate | Elevated liver enzymes (ALT, ALP) | Reported in post-approval monitoring | Weeks to months into treatment |
| Moderate | Hypoalbuminemia (low blood albumin) | Reported in post-approval monitoring | Weeks to months into treatment |
| Serious (rare) | Bloody vomit or melena (dark tarry stool) | <1% but clinically significant | Any time during treatment |
| Serious (rare) | Severe hepatotoxicity | Very rare, post-approval reports | Variable |
It's worth noting that many mild GI side effects resolve within the first one to two weeks of treatment as the dog's system adjusts. However, persistent vomiting, diarrhea lasting more than 48 hours, or any sign of blood in vomit or stool requires immediate veterinary evaluation. Always consult your veterinarian if you observe any adverse reaction, even if it seems mild.
Risk Factors: Which Dogs Are More Susceptible to Galliprant Side Effects?
Key risk factors that increase the likelihood of adverse reactions to Galliprant include:
- Age: Senior dogs (over 8 years) with pre-existing hepatic or renal compromise are at higher risk. Galliprant's safety has not been evaluated in dogs under 9 months.
- Weight: Dogs under 8 lb (3.6 kg) cannot be accurately dosed with available tablet sizes and should not receive Galliprant.
- Pre-existing liver disease: Dogs with elevated baseline ALT, ALP, or bilirubin are at increased risk of hepatotoxicity. Baseline blood work is strongly recommended before starting treatment.
- Pre-existing kidney disease: While Galliprant has less impact on renal prostaglandins than traditional NSAIDs, dogs with chronic kidney disease (CKD) should be monitored closely.
- Concurrent medications: Dogs receiving corticosteroids (prednisone, dexamethasone), other NSAIDs, or nephrotoxic drugs face significantly elevated risk of GI ulceration and organ damage. Galliprant must never be combined with another NSAID or a corticosteroid.
- Dehydration: Dehydrated dogs have reduced renal perfusion, increasing the risk of kidney injury with any NSAID-class medication.
- Breed predisposition: No specific breed has been identified as uniquely sensitive to grapiprant. However, breeds prone to osteoarthritis — including Labrador Retrievers, Golden Retrievers, German Shepherds, Rottweilers, and large/giant breeds — are the most commonly treated population and therefore represent the largest group in which side effects are observed.
How Is Galliprant Safety Monitored? The Diagnosis and Testing Process
Unlike a disease that requires diagnostic identification, monitoring Galliprant's side effects is about establishing baselines and conducting periodic surveillance. Here is the standard veterinary protocol:
- Pre-treatment baseline (before first dose):
- Complete blood count (CBC) — evaluates red/white blood cells and platelets. Cost: $50–$90
- Serum biochemistry panel — evaluates liver enzymes (ALT, ALP, AST, GGT), kidney values (BUN, creatinine, SDMA), albumin, and total protein. Cost: $80–$150
- Urinalysis — assesses kidney concentrating ability and checks for proteinuria. Cost: $30–$60
- Total pre-treatment workup: $160–$300 depending on your region and clinic
- Follow-up at 2–4 weeks:
- Repeat chemistry panel to check for early liver enzyme elevation or kidney value changes. Cost: $80–$150
- Owner symptom check — vet will ask about appetite, stool quality, vomiting, energy levels
- Ongoing monitoring every 6 months:
- CBC + chemistry panel + urinalysis. Cost: $160–$300 per visit
- More frequent monitoring (every 3 months) recommended for senior dogs or dogs with pre-existing conditions
- If adverse signs appear at any time:
- Immediate chemistry panel and potentially abdominal ultrasound ($300–$500) to evaluate liver and GI tract
- Galliprant is discontinued pending results
The total annual cost of safety monitoring for a dog on Galliprant typically ranges from $320 to $600 for a healthy adult dog, and $480 to $900 for a senior dog or one with comorbidities requiring more frequent checks.
Treatment Options When Galliprant Side Effects Occur
If your dog develops side effects, the response depends on severity. Here is how veterinarians typically manage adverse reactions:
| Side Effect Scenario | Veterinary Response | Expected Outcome | Estimated Cost |
|---|---|---|---|
| Mild vomiting (1–2 episodes, self-resolving) | Continue Galliprant with food; monitor closely. Consider splitting dose if vet approves. | Usually resolves within 1–2 weeks of treatment initiation | $0–$50 (recheck exam) |
| Persistent vomiting or diarrhea (>48 hours) | Discontinue Galliprant. Run chemistry panel. Provide supportive care (anti-emetics like maropitant/Cerenia, bland diet). | Most dogs recover fully within 3–5 days after stopping medication | $150–$350 |
| Elevated liver enzymes (ALT >3× normal) | Discontinue Galliprant immediately. Run full hepatic panel. Consider liver protectants (SAMe, silybin/denamarin). Recheck in 2–4 weeks. | Enzymes typically normalize within 2–8 weeks after discontinuation if no permanent damage | $250–$600 |
| GI bleeding (bloody vomit, melena) | Emergency admission. IV fluids, gastroprotectants (sucralfate, omeprazole), possible blood transfusion if severe anemia. Discontinue all NSAIDs. | Prognosis fair to good with aggressive treatment; recovery 3–7 days hospitalized | $800–$3,000+ |
| Severe hepatotoxicity (rare) | Hospitalization, IV fluids, liver support (Denamarin, vitamin K1 if coagulopathy), possible referral to internal medicine specialist. | Prognosis guarded; depends on extent of liver damage. Some dogs recover with supportive care over 2–6 weeks. | $1,500–$5,000+ |
If Galliprant must be discontinued due to side effects, your veterinarian will discuss alternative pain management options. These may include other NSAIDs (if the reaction was mild and not hepatic), gabapentin, amantadine, tramadol, Adequan (polysulfated glycosaminoglycan) injections, Librela (bedinvetmab) anti-NGF monoclonal antibody injections, physical rehabilitation, or weight management programs.
Galliprant vs. Traditional NSAIDs: Side Effect Comparison
Many dog owners want to know whether Galliprant is truly safer than older NSAIDs. Here's a direct comparison based on published data and FDA approval studies:
| Parameter | Galliprant (grapiprant) | Carprofen (Rimadyl) | Meloxicam (Metacam) |
|---|---|---|---|
| Mechanism | EP4 receptor antagonist | COX-2 preferential inhibitor | COX-2 preferential inhibitor |
| Vomiting incidence | ~11% | ~5–10% | ~5–8% |
| Diarrhea incidence | ~8% | ~3–5% | ~3–5% |
| GI ulceration risk | Lower (theoretical, based on mechanism) | Moderate | Moderate |
| Renal risk | Lower (theoretical) | Moderate (dose-dependent) | Moderate (dose-dependent) |
| Hepatotoxicity risk | Low but documented (idiosyncratic) | Low but documented (idiosyncratic, especially in Labradors) | Low but documented |
| Dosing frequency | Once daily | Once or twice daily | Once daily (after loading dose) |
| Minimum weight | 8 lb (3.6 kg) | 5.5 lb (2.5 kg) | 2.2 lb (1 kg) for oral suspension |
| Approximate monthly cost (50 lb dog) | $70–$120 | $30–$60 | $35–$65 |
An important nuance: while Galliprant's vomiting rate (~11%) appears higher than carprofen's (~5–10%) in some datasets, the serious GI complications (ulceration, perforation) are believed to be lower with Galliprant based on its mechanism. The vomiting with Galliprant is often mild, transient, and responsive to administration with food. The American Kennel Club notes that giving Galliprant with a meal can reduce GI upset in many dogs.
Home Care and Daily Management for Dogs on Galliprant
If your veterinarian has prescribed Galliprant and cleared your dog for treatment, here is how to manage daily administration and monitoring at home:
Administration guidelines:
- Give Galliprant once daily at the prescribed dose of approximately 2 mg/kg (0.91 mg/lb).
- Administer with food — this significantly reduces the likelihood of vomiting and GI irritation.
- Do not give on an empty stomach.
- Tablets are scored and can be split along the score line for half-tablet dosing, but should not be crushed or broken into quarters.
- Store at room temperature (68–77°F / 20–25°C), away from moisture and direct sunlight.
Daily monitoring checklist:
- Appetite: Is your dog eating normally? A skipped meal is a yellow flag; two consecutive skipped meals warrant a vet call.
- Stool quality: Check for consistency changes, mucus, or any dark/tarry appearance (melena) — a sign of upper GI bleeding.
- Vomiting: Note frequency, timing relative to dose, and whether vomit contains blood or looks like coffee grounds.
- Water intake: Increased thirst (polydipsia) can signal kidney stress. Track daily water consumption.
- Energy level: While some lethargy can occur early in treatment, profound lethargy or weakness is a red flag.
- Mobility: Track whether the medication is actually improving your dog's comfort — use a simple 1–5 scale for stiffness, willingness to climb stairs, and play behavior.
Lifestyle adjustments that complement Galliprant therapy:
- Maintain your dog at an ideal body condition score (BCS 4–5/9). Every pound of excess weight increases joint loading and inflammation.
- Provide low-impact exercise: controlled leash walks, swimming, and underwater treadmill sessions are ideal.
- Use orthopedic bedding, raised food bowls (for large breeds), and non-slip flooring (rugs on hardwood) to reduce joint strain.
- Discuss omega-3 fatty acid supplementation (EPA/DHA at 75–100 mg/kg combined EPA+DHA daily) with your vet — evidence supports synergistic anti-inflammatory effects with NSAIDs.
Cost of Galliprant Treatment and Side Effect Management
Budgeting for Galliprant involves more than the medication cost alone. Here is a realistic breakdown for a 50 lb (23 kg) dog:
| Expense Category | Low Estimate | High Estimate | Frequency |
|---|---|---|---|
| Galliprant medication (60 mg tablets) | $70/month | $120/month | Monthly |
| Pre-treatment blood work + urinalysis | $160 | $300 | Once (before starting) |
| 2–4 week recheck exam + chemistry panel | $120 | $220 | Once (early follow-up) |
| 6-month monitoring (exam + blood + urine) | $180 | $350 | Every 6 months |
| Treatment of mild GI side effects | $50 | $150 | As needed |
| Treatment of moderate side effects (liver enzyme elevation) | $250 | $600 | As needed |
| Emergency treatment (GI bleeding, severe hepatotoxicity) | $800 | $5,000+ | Rare but possible |
Estimated first-year total cost: $1,200–$2,500 for a dog with no complications, rising to $3,000–$7,000+ if significant side effects require intervention.
Pet insurance can offset some of these costs. Most accident-and-illness policies cover prescription medications and diagnostic monitoring when prescribed for a diagnosed condition like osteoarthritis. However, pre-existing condition exclusions apply, and Galliprant prescribed before policy enrollment may not be covered. Check your policy details carefully.
When to Call the Vet: Red Flag Symptoms
Stop giving Galliprant and contact your veterinarian immediately if your dog exhibits any of the following:
- 🔴 Vomiting blood or material that looks like dark coffee grounds
- 🔴 Black, tarry, or bloody stools (melena or hematochezia)
- 🔴 Complete refusal to eat for more than 24 hours
- 🔴 Severe or persistent vomiting (3+ episodes in 24 hours)
- 🔴 Yellowing of gums, whites of eyes, or skin (jaundice/icterus) — indicates liver damage
- 🔴 Dramatic increase in thirst and urination
- 🔴 Profound lethargy, collapse, or inability to stand
- 🔴 Pale gums (indicates possible internal bleeding or anemia)
- 🔴 Seizures or neurological signs (extremely rare but reported)
Emergency after-hours: If your regular vet is closed, contact your nearest emergency veterinary hospital. For suspected overdose or toxic ingestion, call the ASPCA Animal Poison Control Center at (888) 426-4435 (24/7, consultation fee applies) or the Pet Poison Helpline at (855) 764-7661.
Frequently Asked Questions About Galliprant Side Effects
Can Galliprant cause liver damage in dogs?
Yes, although it is uncommon. Idiosyncratic hepatotoxicity — meaning an unpredictable liver reaction not related to dose — has been reported with Galliprant in post-approval surveillance. This is why baseline liver enzyme testing before starting treatment and periodic monitoring during treatment are standard practice. If your dog's ALT rises above 3 times the upper limit of normal, your vet will likely discontinue the medication and investigate further.
Is Galliprant safe for long-term use in dogs?
Galliprant has been studied for long-term use (up to 12 months in extended field studies) and is approved for chronic administration in dogs with osteoarthritis. However, "safe" does not mean "risk-free." Long-term safety depends on regular veterinary monitoring, appropriate dosing, and prompt response to any adverse signs. Many dogs take Galliprant for years without significant problems.
Can I give Galliprant with other medications?
Galliprant should never be combined with other NSAIDs (carprofen, meloxicam, deracoxib, aspirin) or corticosteroids (prednisone, dexamethasone, prednisolone). This combination dramatically increases the risk of GI ulceration and organ damage. Always disclose every medication, supplement, and over-the-counter product your dog is receiving to your veterinarian before starting Galliprant. Concurrent use with gabapentin, amantadine, or tramadol is generally considered safe but should still be vet-approved.
What happens if I miss a dose of Galliprant?
Give the missed dose as soon as you remember, but only if it is still the same day. If it is already the next day, skip the missed dose and resume the normal once-daily schedule. Never give a double dose to "catch up." Missing a single dose will not cause a dramatic pain flare in most dogs, though some may show increased stiffness the following morning.
What happens if my dog accidentally gets an overdose of Galliprant?
In safety studies, dogs given up to 5 times the labeled dose (10 mg/kg) for 6 months showed increased incidence of vomiting, soft stool, and decreased body weight, but no life-threatening toxicity. However, any suspected overdose should be reported to your veterinarian or the ASPCA Poison Control hotline (888-426-4435) immediately. Bring the medication packaging with you to the vet visit so the exact ingested dose can be calculated.
Are there alternatives to Galliprant if my dog cannot tolerate it?
Yes. If Galliprant causes unacceptable side effects, your veterinarian may recommend alternative NSAIDs (if the reaction was mild GI upset rather than hepatic), Librela (bedinvetmab) monthly injections, gabapentin for neuropathic pain components, Adequan injectable joint support, physical rehabilitation, acupuncture, or a multimodal pain management plan combining several lower-risk modalities. The best alternative depends on your dog's specific condition, age, comorbidities, and the nature of the adverse reaction.
Which breeds are most commonly treated with Galliprant?
Galliprant is prescribed for dogs of any breed diagnosed with osteoarthritis. However, the breeds most frequently receiving the medication mirror those most prone to degenerative joint disease: Labrador Retrievers, Golden Retrievers, German Shepherds, Rottweilers, Bernese Mountain Dogs, Great Danes, and mixed-breed large dogs. No breed-specific sensitivity to grapiprant has been identified in published literature.
What is the life expectancy of a dog on long-term Galliprant?
Galliprant itself does not reduce life expectancy when used appropriately with veterinary monitoring. Dogs with osteoarthritis managed effectively with Galliprant and complementary therapies often live full lifespans appropriate to their breed and size. The medication's role is to maintain quality of life and mobility, which in turn supports overall health by encouraging exercise and preventing weight gain. The prognosis for dogs on Galliprant is tied to their underlying osteoarthritis severity, age, and comorbidities — not to the medication itself.
Managing your dog's osteoarthritis is a long-term partnership with your veterinary team. Galliprant offers a targeted approach to pain relief that many dogs tolerate well, but informed owners who monitor for side effects, keep scheduled blood work appointments, and act quickly on red-flag symptoms give their dogs the safest and most comfortable treatment experience possible.
Beth Carrasco
All our authors care for dogs every day — read more of their work on the authors page.
