Both medications live and die by consistency. Same dose, same times, no changes without your vet, and for potassium bromide, the same diet too. If a dose gets missed or doubled, call your vet and ask what to do rather than improvising.
Zonisamide
Zonisamide is an anti-seizure medication used in dogs both alongside other medications and, in some cases, on its own. It appears in the IVETF consensus on medical management among the options vets weigh for canine epilepsy, and it is usually given twice a day.
What owners commonly see
- Sleepiness, usually most noticeable early on
- Wobbliness or a looser gait
- A smaller appetite in some dogs
Zonisamide is a sulfonamide-class medication. Make sure your vet knows about any previous reaction your dog has had to sulfa medications, and mention every other medication and supplement your dog takes. Your vet weighs those interactions, and can only weigh what they know about.
Worth logging
- appetite, day by day, while starting out
- energy and steadiness, especially the first two weeks
- seizure dates and durations, so the before and after is on one page
Potassium bromide
Potassium bromide (often written KBr) is the oldest anti-seizure medication still in regular veterinary use, and it remains a common choice alongside phenobarbital or on its own. Two things make it unusual:
- It is very slow to build up. Bromide takes months of steady dosing to reach stable levels, so vets judge it over a long window, and blood level checks are part of the routine.
- Diet changes its levels. The salt content of food affects how much bromide the body keeps. That's why the advice that comes with it is to keep the diet consistent and to tell your vet before switching foods, adding salty treats or changing supplements.
What owners commonly see
- Sedation, particularly while levels climb
- Hind-leg wobbliness, which vets ask about at rechecks
- More thirst and hunger
- Stomach upset in some dogs, often eased by giving it with food per your vet's instructions
Call your vet promptly if you see
- wobbliness bad enough that walking or stairs become unsafe
- vomiting that repeats, or refusal to eat
- a skin reaction, facial swelling, or anything allergy-like
- marked behaviour change, restlessness or confusion
- seizures increasing in frequency or length. Bring your log to that call.
One record helps every medication
Whichever medication your dog is on, the useful record is the same: dose times, seizure dates and durations, side effects and food changes on one timeline. That's the page your vet actually reads when deciding what, if anything, should change.