Gabapentin vs trazodone for dogs
Gabapentin and trazodone are human medicines that vets prescribe constantly for dogs, often together. Gabapentin is mainly for nerve and chronic pain; trazodone is mainly for situational anxiety and calm during recovery. Both are inexpensive generics any pharmacy can fill, with one important safety catch for liquids.
Updated October 3, 2026
At a glance
- Main uses in dogs
- Gabapentin
- Chronic and nerve pain, an add-on for seizures, calming before visits
- Trazodone
- Situational anxiety (vet visits, storms, travel) and calm during post-surgery rest
- Common side effects
- Gabapentin
- Sleepiness and wobbliness
- Trazodone
- Sleepiness; occasionally stomach upset or agitation
- Controlled substance
- Gabapentin
- In some states, which limits refills and transfers
- Trazodone
- No
- Liquid warning
- Gabapentin
- Human oral solutions can contain xylitol, which is toxic to dogs
- Trazodone
- Usually given as tablets
Gabapentin Neurontin | Trazodone Desyrel | |
|---|---|---|
| Main uses in dogs | Chronic and nerve pain, an add-on for seizures, calming before visits | Situational anxiety (vet visits, storms, travel) and calm during post-surgery rest |
| Common side effects | Sleepiness and wobbliness | Sleepiness; occasionally stomach upset or agitation |
| Controlled substance | In some states, which limits refills and transfers | No |
| Liquid warning | Human oral solutions can contain xylitol, which is toxic to dogs | Usually given as tablets |
Why vets often prescribe both
The two work differently and complement each other: gabapentin calms nerve signalling and pain, and trazodone acts on serotonin to take the edge off fear. A common plan for a dog that panics at the vet is a dose of each a couple of hours before the visit. Given together they add to each other’s sleepiness, so the vet sets the doses with that in mind. Trazodone needs care with other serotonin-affecting medicines, such as fluoxetine or tramadol.
Filling the prescription
Both are generic human drugs, so any pharmacy can fill them on your vet’s prescription, and cash prices vary between pharmacies. Use capsules or tablets for gabapentin, or a compounded xylitol-free liquid, and never the human oral solution unless the pharmacist confirms it contains no xylitol. Where gabapentin is a controlled substance, the prescription has refill limits and may not transfer between pharmacies; our state guides list which states schedule it.
How quickly they work
Trazodone usually takes effect within one to two hours, so it is given ahead of a predictable event such as a vet visit or fireworks. Gabapentin’s calming effect comes on over a similar time, but for chronic pain it can take days to weeks of regular dosing, and after long use it is reduced gradually rather than stopped, to avoid rebound pain or, in dogs with epilepsy, seizures.
Questions for your vet
- Which problem is each medicine for in my dog?
- Can they be given together, and at what times?
- Is gabapentin a controlled substance in my state?
- Which form avoids xylitol for my dog?
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Sources
- Merck Veterinary Manual
- FDA, extralabel use of drugs in animals (AMDUCA)
- FDA, Animal Drugs @ FDA (approved veterinary labels)
Written by the Script Unlock editorial team from the sources above. It is general information, not advice for you or your pet; your vet decides which medicine is right.
Script Unlock is a marketplace that lets licensed pharmacies quote a cash price on your prescription. It does not prescribe, dispense or sell medication, does not process patient payments, and does not give medical advice. Always follow the instructions of your prescriber and pharmacist and read the medication guide supplied with your medicine.