Phenobarbital For Cats: Overview, Dosage & Side Effects – The Dog Lovers

Phenobarbital is an anti-convulsant remedy used usually in veterinary medicine to help deal with conditions that set off seizures. On this text you’ll be taught the way in which phenobarbital treats victims affected by a seizure dysfunction, negative effects to have a look at for, and some typically requested questions.

Treatment Kind:



Tablets, oral decision, injection.

Prescription Required?:


Mannequin Names:

Luminal, solfoton

Frequent Names:

Phenobarbital, phenobarbitone

On the market Dosages:

Tablets in 15mg, 16.2mg (1/4 grain), 30mg, 32.4mg (1/2 grain), 60mg, 64.8mg (1 grain), 90mg, 97.2mg (1.5 grains), and 100mg. Oral decision: 20mg/5ml (4mg/ml).

Expiration Fluctuate:

Tablets should be saved in light-resistant containers at room temperature (20 to 25 ranges C or 68-77degrees F). Protect from moisture. Merchandise should be used sooner than the expiration date on the package deal khuyến mãi.

About Phenobarbital For Cats

Phenobarbital is a barbiturate remedy. Barbiturates are a class of medicine that act as central nervous system (CNS) depressants. They are often utilized as sedatives, to khuyến mãi with anxiousness, and to manage seizure issues.

A seizure occurs when a sudden discharge {{of electrical}} alerts occurs throughout the thoughts that ends in involuntary train of the toàn thân toàn thân, or seizing. 

Victims experiencing a seizure sometimes lose consciousness and the toàn thân toàn thân would possibly then exhibit the appears of muscle spasms or convulsions, or a pet would possibly go totally rigid with stiff muscular tissues. Drooling, urination, and defecation may also occur. 

Seizures can occur for numerous causes. The presence of thoughts tumors and inflammatory lesions throughout the thoughts could also be one phối of causes the place one factor structurally irregular is present. Pets may also develop seizures from certain underlying medical issues lượt thích liver and kidney sickness, toxin ingestion, or if a diabetic mèo’s blood sugar goes too low. 

Nonetheless seizures might occur secondary to a state of affairs known as idiopathic epilepsy. With epilepsy, the neurologic overexcitement occurs leading to a seizure, nonetheless there’s no recognized set off. Pets with epilepsy sometimes have common MRI (magnetic resonance imaging) scans of the thoughts.

As an anticonvulsant remedy, phenobarbital helps to chop again the prospect of a seizure occurring by reducing the irregular electrical train that ends in seizure episodes. There are a selection of sorts of antiseizure medicine obtainable, each working one other manner, with some extra sensible in some circumstances than others.

Phenobarbital is no doubt one of many oldest antiseizure/antiepileptic drugs obtainable for treating cats with seizure issues. 

What Does Phenobarbital Do For Cats?

Cat drooling

Barbiturates lượt thích phenobarbital normally set off despair of the central nervous system (CNS). They’ll inhibit a few completely totally different neurotransmitters, along with acetylcholine, norepinephrine, and glutamate. Their actions enhance the seizure threshold, requiring way more electrical overexcitement throughout the thoughts to want to occur to set off a seizure. This normally reduces the frequency of seizure events.

The diploma of CNS despair phenobarbital causes will rely on its dose. Their outcomes might depend upon a affected individual’s age, bodily state of affairs, and totally different medicine being taken.

Although it has been spherical for a really very long time, phenobarbital continues to be the simplest medicine to be used as a important drug, or monotherapy, for a seizure state of affairs. It tends to be extra sensible as a first-line choice as compared with one other anti-seizure medicine lượt thích zonisamide and potassium bromide. 

Phenobarbital will also be very low cost, making it a alternative in some circumstances, significantly for long-term use, as compared with an environment friendly nonetheless quite a bit pricier anti-seizure remedy lượt thích Keppra (levetiracetam).

Side Outcomes Of Phenobarbital For Cats

One widespread aspect affect of phenobarbital is excessive consuming and urination.

The most common hostile outcomes seen in cats on phenobarbital embody steadiness factors when strolling, drowsiness, facial itching, an excessive need to eat (leading to weight purchase), and excessive consuming and urinating. 

Whereas very unusual, immune-mediated reactions lượt thích lowered white blood cell and platelet counts have been described. 

Because of it depresses the central nervous system, respiratory despair (ineffective respiration) can occur. Cats look lượt thích further delicate to this affect, though it is nonetheless typically solely seen at bigger doses. 

Phenobarbital is actually metabolized by the liver. Not lượt thích in canine, who usually have liver price elevations on their bloodwork, not lower than for the first couple of weeks when starting phenobarbital, cats do not appear to have the similar sensitivity and liver price abnormalities are considered unusual in kitties.

All of the similar, phenobarbital should be used with good warning in any mèo with an underlying liver dysfunction. Because of the significance of getting good liver function on this remedy, veterinarians usually đánh giá blood work earlier to starting phenobarbital after which not lower than every six months thereafter.

Phenobarbital additionally must be used cautiously in any mèo that is in a state of dehydration, has a low crimson cell rely (anemia), cardiac sickness, or respiratory sickness. 

Whereas phenobarbital does not have direct outcomes on the kidneys, its outcomes on reducing blood stress, which is called hypotension, may end up in issues with renal function if stress all through the kidneys drops too low. That’s typically moreover further a precedence with extreme doses and overdoses.

When first starting phenobarbital, it is common to see excessive sleepiness, lack of vitality, higher thirst and urge for meals, and an elevated need to urinate. These indicators typically abate after about three to 4 weeks. 

In overdose circumstances, a majority of cats current indicators of situation strolling or retaining their steadiness and lethargy/sedation.

Phenobarbital can have drug interactions with totally different medicine. For cats, widespread ones would possibly embody the urge for meals stimulant mirtazapine, the sedative dexmedetomidine, and opioids lượt thích buprenorphine, which should be used cautiously. Use with antihistamines may also improve the sedative affect.

There are many medicine the place concurrent phenobarbital use will decrease their effectiveness and their doses might need adjustment when starting phenobarbital or vice versa. Always make sure that to debate any medicine or dietary dietary supplements your mèo is in the intervening time taking when starting phenobarbital is being considered.

In case you might be ever concerned that your kitty might need developed negative effects whereas using phenobarbital, or if an overdose is suspected, make sure that to mối quan hệ your important veterinarian, neurology veterinarian, the ASPCA Animal Poison Control Center (1-888-426-4435) or Pet Poison Helpline (1-855-764-7661) immediately for extra suggestion. 

Phenobarbital For Cats Dosage

Though phenobarbital is taken into trương mục a protected remedy for cats, it’s going to most likely pose important issues if dosed too extreme, overdosed, or when it is improperly used.

Phenobarbital is utilized in an extra-label technique, which signifies that it does not carry an FDA label, nonetheless a veterinarian can nonetheless prescribe it as long as an lively relationship with the affected individual is present. That is fairly widespread when medicine moreover used for persons are utilized in pets.

Phenobarbital is a schedule IV managed substance. Due to this not lower than in folks, it has some potential for abuse, and prescribed portions and refills are fastidiously monitored.

Phenobarbital is prescribed for people with seizure and sleep issues. This may be very important to not at all use any remedy you may have at Home in your mèo. Human doses and mèo doses of an ordinary remedy would possibly differ significantly and significant negative effects would possibly final result.

Phenobarbital is taken into trương mục a protected remedy for cats when dosed accurately, nonetheless can have important issues when dosed too extreme, overdosed, or when it is improperly used. 

For these causes, a specific dose for phenobarbital is not equipped proper right here. It’s vitally important to on a regular basis search the recommendation of alongside together with your veterinarian sooner than starting a medication lượt thích phenobarbital.

It’s moreover important to not give your mèo a further dose of phenobarbital or to vary the dose your self if a seizure sự khiếu nại has not too way back occurred. In case your mèo is actively having a seizure, it is most important to get your kitty to the closest veterinary hospital for remedy. In no way try to administer an oral remedy to a pet that is actively seizing.

Protected use of phenobarbital entails checking the blood ranges of the remedy throughout the toàn thân toàn thân by blood work. That’s usually actually helpful every six months. That’s the best technique to know if the drug is sustaining therapeutic ranges, what dosage is greatest, and whether or not or not any adjustments should be made. Serum phenobarbital ranges should on a regular basis be rechecked after any dosage adjustments. 

Phenobarbital is also given with or with out meals. Nonetheless, if any digestive upset occurs, giving with meals would possibly help. 

Phenobarbital should not be discontinued abruptly as this might end in withdrawal syndrome. This can be the case if a kitty has been on the remedy for even just a few weeks. The remedy is commonly weaned slowly to help the toàn thân toàn thân modify. Weaning slowly will also be important because of seizures would possibly recur if the remedy is discontinued too shortly. One different remedy to manage seizures will typically should be started on the same time that phenobarbital is being weaned. 


Phenobarbital is a long-standing remedy for administration of seizures in cats and it is typically very environment friendly at controlling seizures. It’s normally very low cost. It does have some anticipated negative effects to look at for when first starting it, significantly lethargy, elevated urge for meals, excessive water consumption, and urination modifications, nonetheless lots of these dissipate after a few weeks. It does require further frequent blood work monitoring than one other medicine.

Phenobarbital might have many interactions with totally different medicine which would require dose adjustments. Always make sure that to debate your mèo’s medical historic previous and totally different medicine utterly alongside together with your veterinarian sooner than starting phenobarbital for top-of-the-line and most cautious technique to your mèo’s nicely being care. 

Recurrently Requested Questions

What does phenobarbital do to cats?

Phenobarbital is used primarily as an anti-seizure remedy in cats. It raises the seizure threshold and reduces seizure frequency by showing as a depressant of the central nervous system (CNS). 

With right dosing, phenobarbital might be very environment friendly at controlling seizures. Nonetheless, at bigger doses, the CNS despair may end up in further relating to outcomes lượt thích sedation, lethargy, respiratory despair, and low blood stress. Because of this cautious and proper dosing by a veterinarian is crucial.

How prolonged can a mèo keep on phenobarbital?

This may increasingly more and more rely further on the primary set off for a seizure dysfunction, along with the general state of nicely being of a specific kitty. In a mèo that is in every other case healthful, and has, say idiopathic epilepsy, an ordinary life expectancy is also attainable. Liver toxicity has not been described in cats lượt thích it has in canine, and with right dosing they’re going to tolerate the remedy fairly correctly.

Nonetheless, in a mèo with concomitant liver sickness or totally different nicely being issues, phenobarbital would possibly deal with seizures correctly, however as well as contribute to further important negative effects. If a mèo is suspected to have a cancerous tumor inflicting seizures, phenobarbital will nonetheless administration indicators not lower than initially, nonetheless a kitty’s prognosis might be further linked to the character of the type of most cancers.

How prolonged does it take phenobarbital to work in cats?

Phenobarbital can take a few hours to attain its peak effectiveness. This may increasingly more and more take wherever from 4 to 12 hours when dosed orally. 

After starting phenobarbital or making dose modifications, blood serum ranges might be not checked for a number of weeks, as a result of it does take some time for the toàn thân toàn thân to manage to the remedy.

Can phenobarbital set off lack of life in cats?

That may be very uncommon, nonetheless in thought would possibly occur if a extremely extreme dose is given or if a mèo in an ailing or sick state is given the remedy. Fortunately, most circumstances of cats getting an overdose of phenobarbital which have been reported to the ASPCA Animal Poison Administration Center solely exhibited indicators of lethargy and ataxia (steadiness and strolling factors).

Cats do look lượt thích further delicate to the respiratory despair outcomes of phenobarbital when given at bigger doses. 

Phenobarbital should not be confused with pentobarbital, which is normally used as a euthanasia drug in veterinary medicine. Whereas they’re every barbiturates, pentobarbital is stronger than phenobarbital. Pentobarbital moreover does not can be found any oral administration sorts.

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