Side effects most often include transient sedation (drowsiness), especially when used with phenobarbital. This may last several weeks. May also see changes in appetite, vomiting, constipation, or personality changes. Other side effects include increased thirst, drinking, and urination.
Consult your veterinarian if you notice any of the above side effects.
When giving high doses, may see severe vomiting, muscle pain, twitching, staggering, an inability to use one or more limbs, or pupils of different sizes. If you observe any of these signs, contact your veterinarian immediately.
Potassium bromide, when used in conjunction with phenobarbital, has been associated with the development of pancreatitis, with signs that include loss of appetite, abdominal pain, and vomiting.
If your pet experiences an allergic reaction to the medication, signs may include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale gums, cold limbs, or coma. If you observe any of these signs, contact your veterinarian immediately.