Gabapentin Dosage Calculator for Cats by Weight
Dose ranges on this page are published veterinary references for education only. Your veterinarian's prescribed dose always wins. When in doubt, call your vet first.
Gabapentin is widely prescribed for cats — for chronic pain and, very commonly, as a single pre-visit dose to reduce stress and allow safer handling at the vet clinic. Published feline references center on 50–100 mg per cat (about 5–10 mg/kg) every 12 hours for ongoing use.
For vet-visit anxiety, many veterinarians prescribe 50–100 mg given 2–3 hours before the appointment. Enter your cat's weight below to see the range and its mg/kg equivalent — then confirm with your veterinarian.
Dose calculator
Dosage chart by weight
| Cat weight | Dose range per dose |
|---|---|
| 5 lb | 50–100 mg (per cat) |
| 8 lb | 50–100 mg (per cat) |
| 10 lb | 50–100 mg (per cat) |
| 12 lb | 50–100 mg (per cat) |
| 15 lb | 50–100 mg (per cat) |
| 18 lb | 50–100 mg (per cat) |
| 20 lb | 50–100 mg (per cat) |
Chart uses the same conservative range as the calculator (50–100 mg per cat (about 5–10 mg/kg)). Always confirm with your veterinarian.
Common formulations
- Capsules — 100 mg capsules
100 mg capsules are the standard feline size; capsules can be opened and mixed per vet instructions
Use the calculator above to convert any of these sizes into an amount for your pet's weight.
How often to give it
Every 12 hours for ongoing use; single dose 2–3 hours before a vet visit for anxiety. 50–100 mg per cat (about 5–10 mg/kg).
Common veterinary uses
- Chronic pain (arthritis)
- Pre-vet-visit anxiety and handling stress
- Seizure management (adjunct, vet-directed)
Safety warnings
Possible side effects
- Sedation and sleepiness (expected — often the goal before vet visits)
- Wobbliness / unsteady walking for several hours
- Mild drooling
- Some human gabapentin oral liquids contain xylitol — toxic to pets. Use only the formulation your veterinarian prescribes.
- Capsules may be opened and the powder mixed with a small amount of food only if your vet approves — the powder is bitter.
Do not use (or ask your vet first)
- Cats with kidney or liver disease need vet-adjusted dosing
- Do not stop suddenly after long-term use — ask your vet about tapering
When to see a veterinarian
- Sedation lasts far longer than expected or the cat cannot be roused normally
- Vomiting, diarrhea, or refusal to eat after dosing
- Tremors or collapse
- Pain or anxiety does not improve as your vet described
Frequently asked questions
How much gabapentin for a cat before a vet visit?
Many veterinarians prescribe 50–100 mg given orally 2–3 hours before the appointment, with peak calming effect around 2–3 hours. Confirm the exact dose and timing with your vet.
How much gabapentin can I give my cat for pain?
Published feline references use about 5–10 mg/kg (typically 50–100 mg per cat) every 12 hours. Your vet will individualize the dose based on your cat's condition and kidney function.
How long does gabapentin last in cats?
Sedative effects typically last 8–12 hours, sometimes longer in senior cats or those with kidney disease. Plan vet visits accordingly.
Can I open a gabapentin capsule for my cat?
Many vets approve sprinkling capsule contents on a small amount of food since cats are hard to pill — but confirm with your vet first, as the powder tastes bitter and dosing accuracy matters.
Sources
- GoodRx — Gabapentin for Cats and Dogs
- Canine Arthritis Resources & Education — Gabapentin and Pregabalin for Pain Relief
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Dose ranges on this page are published veterinary references for education only. Your veterinarian's prescribed dose always wins. When in doubt, call your vet first.