By Dr. Michelle Frye, DVM · Published 2026-05-01
TL;DR. Galliprant (grapiprant) is a piprant-class NSAID alternative that selectively blocks the EP4 prostaglandin receptor for canine osteoarthritis pain. Dosed 2 mg/kg once daily. Spares many of the kidney and stomach prostaglandins traditional NSAIDs hit. Still cannot be combined with steroids or other NSAIDs.
Same Disease, Different Mechanism
If carprofen is the workhorse, Galliprant is the new conversation. Approved by the FDA in 2016 specifically for canine osteoarthritis, grapiprant works by blocking the prostaglandin receptor most directly responsible for arthritis pain — rather than blocking the upstream COX enzymes that traditional NSAIDs target. The result is a drug with most of the pain-relieving benefits and a more conservative side-effect profile, particularly in dogs whose owners are nervous about long-term NSAID use.
What Galliprant Actually Does
Galliprant is a piprant — a class of drug that selectively antagonizes the EP4 prostaglandin receptor. Prostaglandins do many jobs in the body: some maintain stomach lining, kidney blood flow, and platelet function (the things traditional NSAIDs disrupt), while one specific subtype (EP4) drives arthritis pain and inflammation. Galliprant blocks only the latter.
- Dose: 2 mg/kg orally once daily.
- FDA-approved for dogs ≥ 9 months and ≥ 8 lb.
- Onset: noticeable improvement often within the first week, full effect by 2–4 weeks.
- Forms: 20 mg, 60 mg, and 100 mg tablets.
Things People Are Wrong About
Myth 1: "Galliprant has no side effects." Galliprant has fewer reported GI and renal effects than traditional NSAIDs — but mild vomiting, soft stool, and decreased appetite still occur. "Safer" does not mean "safe to ignore."
Myth 2: "I can give it with carprofen for breakthrough pain." No. Galliprant is still in the NSAID family of caution — do not combine with traditional NSAIDs or with steroids. Pick one anti-inflammatory at a time.
Myth 3: "It works as fast as carprofen." Pain relief is real but typically more gradual. Many owners notice the difference at 5–10 days; cumulative benefit at 2–4 weeks.
Myth 4: "It's only for senior dogs." Approved from 9 months and 8 lb. Some young dogs with juvenile elbow or hip dysplasia are candidates well before old age.
When NOT to Use Galliprant
Avoid in dogs under 9 months or under 8 lb. Avoid combining with traditional NSAIDs (carprofen, meloxicam, Onsior) or with corticosteroids. A washout period is required when switching from another NSAID. Use cautiously in dogs with significant pre-existing GI, liver, or kidney disease. Periodic bloodwork is recommended for long-term therapy.
What I Tell Owners After 30 Years
Galliprant is a thoughtful addition to the toolkit. It is not a wholesale replacement for carprofen, meloxicam, or the other COX-inhibitor NSAIDs that have decades of evidence behind them. But for the senior dog whose owner is uneasy about traditional NSAIDs, the dog with mildly elevated kidney values, or the dog who didn't tolerate a traditional NSAID's GI side effects — Galliprant is exactly the kind of next-generation tool that makes long-term arthritis care kinder and more individualized.
Frequently Asked Questions
How does Galliprant work?
Galliprant (grapiprant) selectively blocks the EP4 prostaglandin receptor responsible for arthritis pain and inflammation, sparing the prostaglandins that protect the stomach, kidneys, and platelets.
How long does Galliprant take to work?
Many owners notice improvement within 5–10 days, with full cumulative benefit by 2–4 weeks of daily dosing.
Is Galliprant safer than Rimadyl?
Galliprant has a more selective mechanism and fewer reported GI and renal effects than traditional NSAIDs, but it is not free of side effects. Safety in any individual dog depends on age, organ function, and overall health.
Can Galliprant be given with prednisone?
No. Galliprant should not be combined with corticosteroids or with other NSAIDs (carprofen, meloxicam, Onsior). A washout is required when switching.
Can cats take Galliprant?
No. Galliprant is FDA-approved only for dogs 9 months and older.
What are the side effects of Galliprant?
The most common side effects are vomiting, soft stool or diarrhea, and decreased appetite. Long-term users should have periodic bloodwork.
Can Galliprant be combined with gabapentin?
Yes. Gabapentin works through a different mechanism and is commonly added for multimodal arthritis pain control.
Where can I buy Galliprant?
Galliprant is prescription-only. Smarty Vets dispenses Galliprant tablets and pharmacy-compounded grapiprant from a licensed pharmacy.
This article is for educational purposes and is not a substitute for veterinary advice. Always consult your veterinarian before starting, stopping, or changing any medication for your pet.