Ursodiol (Actigall) for Dogs: Uses, Dosage & Side Effects

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Ursodiol, also called ursodeoxycholic acid, is a prescription bile acid your vet may use to support dogs with certain liver and gallbladder problems. In veterinary medicine, it is often chosen when the goal is to improve bile flow and reduce the irritating effects of more toxic bile acids on liver cells.

This medication is not a general stomach drug and it is not right for every dog with vomiting or elevated liver values. It is usually part of a broader plan based on exam findings, bloodwork, and often abdominal ultrasound. Your vet may pair it with diet changes, liver-support supplements, or other medications depending on the cause.

In dogs, ursodiol is commonly used off-label, which means vets prescribe it based on veterinary evidence and experience even though the product was developed for human use. That is common in veterinary medicine. Many dogs take it well, but it should only be used when your vet has confirmed that helping bile move is appropriate and safe.

Your vet may prescribe ursodiol for dogs with cholestatic liver disease, meaning bile is not flowing normally, or for some dogs with gallbladder sludge, chronic inflammatory liver disease, or selected cholesterol-containing gallstones. It can also be used as part of supportive care in some chronic hepatobiliary conditions where improving bile flow may help protect the liver.

That said, ursodiol is not appropriate in every gallbladder case. If a dog has a complete bile duct obstruction, a ruptured gallbladder, or a gallbladder mucocele that needs urgent intervention, medication alone may be unsafe or inadequate. In those situations, your vet may recommend imaging, hospitalization, surgery, or referral instead.

Because liver and gallbladder disease can look similar from the outside, the reason for using ursodiol matters. A dog with mild enzyme changes on routine bloodwork may have a very different plan than a dog with jaundice, abdominal pain, or a distended gallbladder on ultrasound. Your vet uses the full picture to decide whether ursodiol fits.

Ursodiol dosing for dogs varies by diagnosis and formulation, so follow your vet's label exactly. A commonly cited veterinary dose is 15 mg/kg by mouth every 24 hours, though some vets divide the total daily amount into once- or twice-daily dosing depending on the case and the product used.

Ursodiol is generally given with food, which may improve absorption and help with tolerance. If your dog needs a very small dose, has trouble swallowing capsules, or needs a custom strength, your vet may prescribe a compounded liquid, chew, or capsule.

Do not change the dose on your own, even if your dog seems better. Liver and gallbladder conditions often need recheck bloodwork and sometimes repeat ultrasound to see whether the medication is helping. If you miss a dose, many vets advise skipping the missed dose and giving the next one at the regular time rather than doubling up, but confirm your dog's instructions with your vet.

Many dogs tolerate ursodiol well, but mild digestive upset can happen. Reported side effects include diarrhea, nausea, and abdominal discomfort. Giving the medication with food may help some dogs.

More serious signs deserve a prompt call to your vet. These include vomiting, poor appetite, unusual tiredness, worsening yellow discoloration of the eyes or gums, or any clear decline after starting the medication. Those signs do not always mean ursodiol is the cause, but they can signal that the underlying liver or gallbladder problem is getting worse or that the treatment plan needs to change.

See your vet immediately if your dog has a swollen or painful abdomen, repeated vomiting, collapse, marked lethargy, or jaundice. Those signs can point to urgent biliary disease and should not be monitored at home.

Ursodiol can interact with some medications and supplements, so your vet should review everything your dog takes, including over-the-counter products and liver supplements. One well-known concern is aluminum-containing antacids, which can interfere with ursodiol and should not be given at the same time unless your vet specifically directs it.

Because ursodiol works in the biliary system, your vet may also think carefully about how it fits with other liver, gallbladder, or gastrointestinal medications. In some dogs, combination therapy is appropriate. In others, the timing, formulation, or diagnosis needs to be clarified first.

Tell your vet if your dog is taking antacids, bile-acid related medications, compounded supplements, or multiple prescriptions from different clinics. That helps your vet build a plan that is safer, more coordinated, and easier to follow.