L-theanine For Cats: Safe Dosage | Benefits & Precautions

L-theanine is a type of amino acid commonly found in green tea leaves and is popular for its relaxing effects for treating stress-related health issues in humans and animals. 

The use of  L-theanine for treating stress-related behavioral issues in cats and dogs is growing daily. Veterinarians often prescribe this amino acid to combat stress-related problems in pets.

A study case report was published in the Irish veterinary journal regarding using L-theanine for cats. For testing the effectiveness of L-theanine in felines, 30 privately owned cats were included in the study for 30 days. 

They concluded that L-theanine is effective in managing stress-related behavioral issues in felines. 

Knowing about the safe dosage of L-theanine for cats, its benefits, possible side effects, and secure serving methods is essential to avoid complications.

This blog post is an ultimate guide about L-theanine for felines. 

L-theanine for cats

How does L-theanine Work?

L-theanine works by increasing the body’s stress tolerance level and energy reserves when absorbed into the bloodstream. 

L-theanine works as a calming agent by regulating stress, emotions, appetite, etc., by increasing neurotransmitter chemicals known as GABA and dopamine.

On the other hand, L-theanine reduces levels of  Norepinephrine responsible for stress and anxiety. 

Along with these effects, the L-theanine enhances alpha brain waves by triggering the release of alpha waves which helps to enhance relaxation, focus, and creativity and reduce stress and anxiety

Uses of L-theanine:

In cats, L-theanine can treat stress-related issues caused by loud noises, fireworks anxiety, interaction with unfamiliar pets and people, food aggression, change in the environment, lack of socialization, and travel anxiety. 

L-theanine Dosage for cats

The safe Dosage of L-theanine 25 mg tablets for cats is one tablet twice a day or ½ 50mg tablet twice a day for 15-30 days. A newborn Kitty or kitty weighing below 1kg should take L-theanine tablets only with vet advice. The treatment may take as long as 60 days.

If you don’t observe any improvement or if you notice any adverse effects with medication, stop giving the medicine and contact your veterinarian for gentle advice. 

L-theanine Benefits for Felines

  • Reduces Stress & anxiety
  • Improve Mode and good emotions
  • It helps your kitty stay calm
  • Improves peaceful sleep
  • Decreases aggressive behaviors
  • Reduce appetite

Possible Side Effects of L-theanine in Cats

Although serving the medicine in a safe dose is safe, as with other medications, L-theanine has some side effects. Commonly reported side effects of L-theanine amino acids in cats are:

  • Vomiting & Diarrhea
  • Frequent Urination
  • Overgrooming
  • Excessive scratching
  • Change in the behavior 

 L-theanine overdose Effects

Overdosing on any medicine can be toxic and even fatal for humans and pets. Any products that contain L-theanine must be served in a safe dose and as directed by your veterinarian.

Overdosing symptoms of L-theanine in felines are:

  • Pale Gums
  • Lake of condonation
  • Lack of appetite
  • Severe vomiting or diarrhea
  • Collapse
  • Seizures 

Is L-theanine safe for all cats?

No, different cats may react differently to certain medications. The medicine efficiency has not been tested for pregnant, lactating, and felines intended for breeding.

Also, cats allergic to this medicine or other stress control drugs should take L-theanine with the veterinarian’s advice.        

Common Brand Name of  L-theanine for pets

  • Anxitane®        
  • Suntheanine® 


Always provide any medication with your veterinarian’s advice only.

Never overdose your pet on any drug. Consistently follows the safe dosage guidelines.

Take a gap of at least 10 hours between the doses. 

Keep a close eye on your pet. Stop the medicine and contact your veterinarian immediately if you observe any adverse symptoms.

Give the L-theanine pill within the feline food to avoid choking hazards.

If your felines are not showing any improvement, contact your vet. 


Is theanine safe for cats?

Yes, theanine is among  the proven amino acid and has wide veterinary use for cats to treat stress-related issues. However, overdosing is toxic and can lead to complications. Consistently follows the safety guidelines. 

Is Anxitane safe for cats?

Anxitane is a famous brand of  L-theanine used for pets, including dogs and cats. Veterinarians often prescribe Anxitane for the treatment of stress-related behavioral problems in pets. 

How long does it take Anxitane to work?

Anxitane starts its effect within 30-1 hours once absorbed in the blood streams. However, the treatment for addressing stress-related issues can take 15-30 days, depending on the problems being treated. 

Is Anxitane over the counter?

Yes, Anxitane is among  over-the-counter medications that can be used to keep the pet relaxed and calm. 

Can humans take Anxitane?

Anxitane L-Theanine is specially formulated for pet uses and is not considered ideal for the use of humans. There are many specially formulated L-Theanine medicine available that humans can safely use.

How many mg of L-Theanine can I give my cat?

The preferred dose of L-Theanine for cats is 1 25mg tablet twice daily. 

Can my cat overdose on L-Theanine?

Overdosing on L-Theanine can lead to severe health complications and even be fatal. Never overdose your pet on any medication. 


Although L-Theanine is a helpful and safe amino acid for treating stress in cats, it is important to never overdose your pet on any medication.

Always consult with your veterinarian before starting your pet on any new medication, even if that medication is a natural supplement like L-Theanine.

And be sure to follow the safety guidelines for dosage and administration closely to avoid potential health complications.

If you have any further queries please write to us in the comment section.

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