September 04, 2023 | Cat

What is Thyronorm for cats?

Thyronorm for Cats - 5mg/ml Oral Solution
Thyronorm for Cats - 5mg/ml Oral Solution
  • Prescribed for overactive thyroid
  • Treats symptoms
  • Decreases thyroid production
View Product
Thyforon for Dogs (Flavoured Tablets)
Thyforon for Dogs (Flavoured Tablets)
  • Treats underactive thyroid
  • Hormonal treatment
  • Palatable, flavoured tablets

If your cat has been prescribed Thyronorm to help to treat them when they are suffering from a number of different conditions you may be looking for more information in order to give you a better understanding of the medication that they will be taking. In this article, we will be answering many different questions regarding the medication including what it treats, the forms that it comes in, and more about the specific conditions that it treats. 

What is Thyronorm for cats?

Thyronorm is a medication that is used to treat a condition known as feline hyperthyroidism. Thyronorm contains a medication known as levothyroxine which is a medication that is also used to treat underactive thyroid conditions in humans. Thyronorm should only ever be used when it has been prescribed by a registered vet. 

What is Thyronorm for cats used for?

Thyronorm is used to effectively treat feline hyperthyroidism. Feline hyperthyroidism is a common condition that occurs when the thyroid gland does not produce enough thyroid hormones. These hormones are used to help regulate a cat’s metabolism. This can result in your cat losing weight, becoming hyperactive, urinating more, and having an increased appetite. Hyperthyroidism should be treated properly as, in some cases, it can lead to high blood pressure and can result in heart problems. 

What form does Thyronorm for cats come in?

The Thyronorm that you can purchase from UK Pet Drugs is in the form of an oral solution. This is the most common form of Thyronorm that you will be prescribed and is also the most effective. Oral solutions are easier to give to cats and are more reliable than giving them a tablet. With an oral solution, you can be sure that your cat is getting the medication they need. 

What dosages is Thyronorm for cats available in?

The dosage that your cats should have of Thyronorm will be given to you by your vet as they will know the specific details of your cat’s condition. The strength of the Thyronorm you can purchase from UK Pets is 5mg/ml of medication. This means that there is 5mg of medication per millilitre of liquid. You will be told how much Thyronorm you should give to your cats when you are given your prescription. You can purchase bottle sizes of 30ml and 100ml from UK Pets.

Do I need a prescription to order Thyronorm for cats?

Thyronorm is a prescription-only medication which means that you will need a valid prescription from a vet before your order will be dispatched from UK Pets. You can still add Thyronorm to your basket, checkout and pay, but we won’t be able to send your order out until we have received your prescription.

Feline Hyperthyroidism

What are the signs of hyperthyroidism in my cat?

If you believe that your cat may be suffering from feline hyperthyroidism then there are some signs that you can keep your eye out for in order to spot it. Some of the main signs of hyperthyroidism include:

  • Weight loss

  • Hyperactivity

  • Increased appetite

  • Increased urination

Spotting the signs of hyperthyroidism is important as it is vital that it is treated before it leads to other issues such as high blood pressure or heart problems. 

What are the common causes of hyperthyroidism in my cat?

It can be hard to pinpoint the exact cause of hyperthyroidism in a cat. There are many different reasons why it can develop. Here are a few causes of feline hyperthyroidism:

  • A benign tumour on the thyroid gland

  • An overgrowth of normal thyroid tissue called hyperplasia

  • Exposure to environmental toxins

Your vet will be able to provide more information on the potential cause of your cat’s hyperthyroidism if that is what they are diagnosed with.

When should I see a vet about hyperthyroidism in my cat?

You should take your cat to the vet if they begin to show any of the signs of hyperthyroidism. Your cat may be diagnosed with hyperthyroidism, or it could be diagnosed with another condition to which the symptoms are similar. There is also the possibility that their symptoms are nothing to worry about, however, it is always better to make sure that this is the case by visiting the vet.

What questions will a vet ask me about hyperthyroidism in my cat?

Being prepared for what your vet may ask you before you visit them is a good way of ensuring that your cat will get the treatment that they may need quickly in order to get their condition under control. Here are some questions that your vet may ask you when you take your cat to see them:

  • What symptoms have you noticed in your cat?

  • How long has your cat been displaying these symptoms?

  • Has your cat been vomiting or have they had diarrhoea recently?

  • Has your cat’s behaviour changed recently?

  • Has your cat’s coat changed recently?

  • Does your cat use any other medications?

It is important that you answer all of the questions asked by your vet to the best of your ability to ensure that they can diagnose your cat’s condition. 


Who is Thyronorm for cats manufactured by?

Thyronorm for cats is a medication that was brought to market by a company called Norbrook. It is a licensed medication for treating feline hyperthyroidism. 

Who are Norbrook?

Norbrook, or to give them their full name Norbrook Laboratories Limited, is a pharmaceutical company that is based in Newry, Northern Ireland. Norbrook is one of the largest privately-owned veterinary medicine companies that develop, manufacture and distribute medications. 

Thyronorm FAQs

Can Thyronorm be given to cats with their food?

Thyronorm is an orally administered medication that comes in liquid form. To make it easy to get into your cat's system, you can mix Thyronorm in with your cat's food. This ensures that your cat takes their medication. If you are concerned about how to get your cat to take their medication then you should speak to your vet to get some advice. If you are wanting to speak to a vet without having to visit one in person, an online vet like those at PocketVet are very useful for answering questions such as how to get your cat to take their medication.

How quickly does Thyronorm for cats take effect?

The amount of time it takes for Thyronorm to begin to take effect after your cat takes it will depend on a number of factors including your cat’s age and weight. The severity of your cat's condition can also affect how quickly the medication works. It can take a few weeks before the level of medication in your cat’s bloodstream reaches therapeutic levels. Your vet will monitor how effectively the medication is treating your cat and will make changes to dosage if needed. Even if you do not notice an improvement, you should still give your cat their medication as outlined by your vet as it can take time for the medication to fully regulate thyroid function. 

How often should Thyronorm for cats be given to your cat?

The dosing frequency of Thyronorm will be outlined to you by your vet when it is first prescribed to you. Usually, this will depend on your cat’s specific condition as well as specific details about your cat including their age and weight. Usually, Thyronorm is given to cats on a once-daily basis and you should be told what time of day would be best to give it to them. You need to follow your vet’s instructions closely when giving your cat medication. It should also be noted that Thyronorm is usually a lifelong medication.

Is Thyronorm for cats suitable for short-term usage?

Thyronorm can be used for the short-term treatment of thyroid hormone deficiency in cats. Depending on the specific needs of the cat in question, Thyronorm can be used for both short-term and long-term treatment of thyroid-based conditions, and you should always follow the advice of your vet. 

Is Thyronorm for cats suitable for long-term usage?

Most commonly, Thyronorm will be prescribed for the long-term treatment of hyperthyroidism and typically it will be prescribed for the remainder of your cat’s life. If your cat is taking Thyronorm for a long period of time then your vet will constantly be monitoring how the medication is working during the course of their treatment. Your cat may need to have regular checkups and blood tests to ensure that the medication is still right for them. 

Can Thyronorm for cats have any side effects?

As with all other prescription medications, Thyronorm can provide some side effects. Some of the most common side effects of Thyronorm usage are:

  • Vomiting

  • Loss of appetite

  • Diarrhoea

There are also some less common side effects, including:

  • Restlessness

  • Increased urination

  • Increased drinking

If you notice any of the less common side effects are happening for sustained periods of time then you may need to consider asking your vet about the cause of this.

Is Thyronorm not suitable for any cats?

Thyronorm is generally considered to be safe for the majority of cats to use. Your vet will be able to see your pet’s medical records and should be able to make a decision on whether or not Thyronorm will be the right course of action. Cats that have a pre-existing heart or kidney condition, or cats that are using medication for the heart or kidneys may not be able to use Thyronorm. Thyronorm should also not be used by cats that are pregnant or cats that are nursing kittens. 

Is it safe to give Thyronorm for cats to my cat if they take other medications?

In the majority of cases, Thyronorm will be able to be used by cats if they are using other medications, aside from heart or kidney medications. Your vet will assess whether or not your cat will be able to have Thyronorm based on the medications that they are already using. 

What do cat owners say about Thyronorm for cats?

Here are some reviews from real owners of cats who are taking Thyronorm:

“This medication helps keep my cat’s condition under control, as prescribed by my vet.”

“Does exactly what it says on the bottle.”

Where can I buy Thyronorm for cats online?

You can purchase prescribed Thyronorm for your cat online from UK Pet Drugs, provided that you have a valid prescription. When you give us your prescription we will be able to fulfil your order. 

Thyronorm for Cats - 5mg/ml Oral Solution
Thyronorm for Cats - 5mg/ml Oral Solution
  • Prescribed for overactive thyroid
  • Treats symptoms
  • Decreases thyroid production
View Product
Thyforon for Dogs (Flavoured Tablets)
Thyforon for Dogs (Flavoured Tablets)
  • Treats underactive thyroid
  • Hormonal treatment
  • Palatable, flavoured tablets


Thyronorm -

Medically reviewed by:

Miss Joy Sarah Helen Howell

DipAVN(Surgical) RVN EA SQP