Selegiline for dogs is a medication used to treat canine cognitive dysfunction syndrome, improving brain function in older dogs. Many senior dogs show significant improvement with selegiline treatment. This article will discuss how selegiline works, its benefits, possible risks, and correct administration.

Key points

  • Selegiline is an FDA-approved medication for treating canine cognitive dysfunction, enhancing dopamine levels, and improving cognitive function in older dogs.
  • Common side effects of selegiline include digestive issues and behavioral changes, requiring close monitoring and consultation with a veterinarian to manage potential adverse reactions.
  • Proper dosage, administration in the morning, and awareness of drug interactions are important for the safe and effective use of selegiline in dogs.

Understanding selegiline for dogs

Selegiline hydrochloride is an FDA-approved medication designed to tackle cognitive dysfunction in senior dogs, helping to ease symptoms similar to human dementia. Selegiline helps to increase dopamine in the brain, thereby boosting cognitive abilities and overall brain function.

Typically given once a day in the morning, selegiline tablets can help reduce nighttime restlessness. Most dogs handle this treatment well, but it’s important to keep a close eye on your dog once you start. If you notice any concerning symptoms, don’t hesitate to contact your veterinarian immediately. Also, if your dog is on other medications, your vet will need to carefully consider potential drug interactions to ensure everything works safely together.

How selegiline benefits senior dogs with cognitive dysfunction syndrome

Canine cognitive dysfunction (CCD), a disorder commonly found in older dogs, involves the deterioration of mental faculties analogous to Alzheimer’s disease seen in humans. Dogs affected by this syndrome may exhibit various clinical signs such as confusion, altered sleep-wake cycles, and reduced interaction with their human families. Treatment for canine cognitive dysfunction can effectively bolster the cognitive abilities of dogs diagnosed with this condition and mitigate these symptoms.

It has been found that around 77% of dogs diagnosed with CCD experience an improvement when treated with selegiline—evidence of its effectiveness against the challenges presented by cognitive decline in senior dogs. By enhancing learning capabilities, memory retention, and regulating sleep patterns, selegiline can significantly improve the quality of life for aging dogs. It indirectly alleviates behaviors like anxiety and pacing, which contributes to a more serene living situation for both dog and owner.

Although Selegiline has shown promise in slowing the progression of cognitive dysfunction, it isn’t regarded as a curative treatment. The onset benefits from using selegiline might not be evident until approximately 4 to 6 weeks into therapy – demanding patience from those administering it consistently over time. Timing is important for optimal results, particularly regarding improved nocturnal restfulness and daily activity levels.

senior spaniel

Additionally, selegiline can help manage sundowners in dogs. Selegiline's role in improving sleep-wake cycles can help reduce nighttime restlessness, leading to a more restful and calm evening routine for your dog and yourself.

Mechanism of action: How selegiline works in dogs

Now let's get into the finer details as to how selegiline works, in case you're interested.

Selegiline, a type of monoamine oxidase inhibitor (or MAOI for short), works by slowing down the breakdown of important neurotransmitters like dopamine. By doing this, it helps increase the amount and activity of dopamine in your dog's brain, which is important for maintaining their cognitive abilities and combating the effects of cognitive decline.

Aside from that, selegiline also plays a key role in reducing oxidative damage to neurons, which is important for keeping your senior dog's brain in tip-top shape.

Administering and dosing of selegiline for dogs

When you're giving selegiline to your dog, it's important to stick to the guidelines of veterinary medicine and follow your vet's instructions closely.

The recommended daily dose ranges from 0.5 mg/kg to 1.0 mg/kg of your dog's body weight, and it's best given once in the morning. This helps to minimize nighttime restlessness and improve sleep patterns.

As your dog starts on selegiline, the initial dosage might need tweaking based on how well they tolerate the medication. Before you make any changes to the prescribed selegiline dose, be sure to get your vet's approval to ensure both the effectiveness of the treatment and your dog's safety.

When starting selegiline, pay close attention to any changes in your dog's behavior or overall health and demeanor. Following your vet's instructions accurately will help ensure the best possible outcome during your dog's treatment for cognitive issues as they age.

Recognizing the side effects of selegiline

Selegiline is typically well-received by dogs, but in certain cases, it can lead to adverse effects. Digestive upset manifesting as vomiting or diarrhea and alterations in behavior such as increased aggression or confusion are some of the more common side effects to watch for.

Although infrequent, side effects can include:

  • Vomiting and diarrhea
  • Anorexia (lack of appetite)
  • Excessive panting
  • Loss of hearing (rare)

Signs of serotonin syndrome such as:

  • Heightened agitation
  • Disorientation
  • Accelerated heart rate
  • Elevated blood pressure

If you observe any of these side effects, please reach out to your veterinarian right away for advice.

What to do if you miss a dose

If you happen to forget to give your dog a dose of selegiline, just give it as soon as you remember. But if it's almost time for the next dose, skip the missed one and continue with the regular schedule.

Doubling up on doses isn't a good idea, as it could lead to unwanted side effects. If you're unsure about handling a missed dose or want to keep your dog's treatment on track, don't hesitate to reach out to your veterinarian for advice.

old golden retriever 1

Drug interactions to be aware of

It is important not to mix selegiline with specific prescription medications. Drugs like selective serotonin reuptake inhibitors (SSRIs) and tricyclic antidepressants are particularly risky when taken in conjunction with selegiline. Other monoamine oxidase inhibitors, along with substances such as meperidine and tramadol, also have a high potential for severe reactions if used at the same time.

Examples of other drugs to avoid combining selegiline with include:

  • Fluoxetine
  • Clompiramine (Clomicalm®)
  • Amitriptyline

If your dog is taking fluoxetine (an SSRI), you'll need to wait at least 4-5 weeks after stopping fluoxetine before starting selegiline. Fluoxetine stays in the body for a longer time, so this longer waiting period is important to avoid interactions.

A 2-week waiting period after discontinuing selegiline is recommended for all other behavioral modifying medications.

Alternatives to selegiline

Although selegiline is beneficial for many dogs, certain individuals may not experience improvement and might necessitate different treatments.

Consideration could be given to additional monoamine oxidase inhibitors, selective serotonin reuptake inhibitors, and tricyclic antidepressants as alternatives.

For supporting brain function in dogs suffering from cognitive dysfunction, natural supplements including SAMe (S-adenosyl methionine), and omega fatty acids (such as fish oil) can be beneficial.

Monitoring selegiline use

It is important to watch your dog closely while they are taking selegiline. This aids in evaluating the effectiveness of the medication and detecting any side effects early on.

Additionally, pet owners should be alert for signs of severe side effects such as serotonin syndrome when their canine friends start taking selegiline. Manifestations like agitation, disorientation, an increased heart rate, and elevated blood pressure could indicate this condition. If noticed, you need to see your veterinarian immediately.

While there’s no need for specialized monitoring during your dog’s course with selegiline apart from being observant, regular check-ins with your veterinarian are advisable.


In conclusion, selegiline hydrochloride is a valuable medicine for managing cognitive dysfunction and behavior changes in older dogs. By enhancing dopamine levels, protecting nerve cells, and improving cognitive abilities, selegiline helps enhance the quality of life for aging pets. Please follow your veterinarian's instructions for administration, monitor for side effects, and be aware of potential drug interactions to ensure safe and effective treatment.