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Using an Insulin Pen for your Diabetic Cat
My cat has diabetes - I need to use an insulin pen
When your cat has diabetes, it may be necessary to use an insulin pen. Initially designed for human use, insulin pens have become increasingly popular for veterinary purposes due to their ease of use, accuracy, and convenience. They are a compact, handheld device that delivers insulin subcutaneously (under the skin). Insulin pens contain a cartridge pre-filled with insulin and are equipped with a dial to set the dosage, a disposable needle, and a button to administer the insulin.
Insulin pens offer several advantages over traditional syringes, including more precise dosing, ease of handling, and reduced discomfort for both the cat and the owner.
Before you start
Before using an insulin pen, it is essential to consult your vet to determine the appropriate type and dosage of insulin for your cat.
The most commonly used insulins for cats include Glargine, Detemir, and PZI (Protamine Zinc Insulin), each with specific properties and dosage requirements.
Different types of insulin require different insulin pens. For example, Glargine insulin may use the Lantus SoloStar pen, while Detemir insulin uses the Levemir FlexTouch pen. Make sure to select the insulin pen that is compatible with the type of insulin your veterinarian prescribes.
In addition to the insulin pen, you will need sterile, disposable pen needles, alcohol swabs, and a sharps container for proper disposal of used needles. Ensure the insulin is stored properly, typically in a refrigerator, and never used past its expiration date.
A step by step guide to using an insulin pen
Always start by washing your hands thoroughly with soap and water to minimise the risk of infection.
Prepare the insulin pen:
- Remove the cap from the insulin pen.
If the insulin requires mixing (such as PZI), gently roll the pen between your palms 10-20 times to ensure an even suspension. Do not shake the pen vigorously, which can cause air bubbles and affect dosing accuracy. - Attach a new, sterile needle to the pen by screwing it onto the threaded tip. Remove the outer and inner protective caps from the needle.
Prime the pen:
- To remove air bubbles and ensure accurate dosing, prime the pen by dialling a small dose (usually 1-2 units) and pressing the button to release the insulin. Repeat this process until a drop of insulin appears at the needle tip.
Set the correct dose:
- Turn the dosage dial to the prescribed number of units of insulin. Ensure that the dose is correctly aligned with the pen’s indicator window.
Select an injection site for your cat:
- The recommended injection sites for cats are the loose skin areas, such as the scruff of the neck or the sides of the abdomen. Rotate injection sites regularly to prevent lipodystrophy (localised fat tissue changes) and maintain insulin absorption efficiency.
Administer the insulin:
- Gently lift the loose skin at the chosen injection site to form a tent-like fold.
- Insert the needle at a slight angle (usually 45 degrees) into the fold of the skin. Press the button on the insulin pen to deliver the insulin dose.
- After pressing the button, hold the pen in place for 5-10 seconds to ensure the full dose is delivered.
Remove and dispose of the needle:
- Carefully remove the needle from your cat’s skin and immediately place it into a sharps container. Do not recap the needle to avoid accidental needle-stick injuries.
- Record the dose and time: Maintaining a log of insulin doses, times, and any relevant observations (such as behaviour changes or appetite) can help your veterinarian fine-tune your cat’s diabetes management plan.
Tips for successful insulin administration
Cats are sensitive to their owner’s emotions. Remaining calm and handling your cat gently will help minimise stress.
Reward your cat with praise, petting, or a small, diabetes-friendly treat after each injection to create a positive association with insulin administration.
Regular monitoring of your cat’s blood glucose levels is essential. Work closely with your veterinarian to develop a monitoring schedule.
Hypoglycemia (low blood sugar) can occur if too much insulin is administered. Symptoms include lethargy, tremors, uncoordinated movements, and seizures. If you suspect hypoglycemia, have a plan in place with your veterinarian on how to respond.
Using an insulin pen for your diabetic cat can simplify the process of insulin administration, providing precise dosing and ease of use. By following proper preparation and administration techniques, you can help manage your cat’s diabetes effectively and improve its quality of life. Always work closely with your veterinarian to tailor the insulin regimen and address any concerns that may arise during treatment.
“These devices deliver insulin just under the skin.”
Are you worried about your cat’s health?
If you are concerned about your cat, please reach out to our friendly team. Call us on 1300 228 377 or fill out the contact form below. In an emergency, please contact your local vet.
For vets – to refer a patient or book a telehealth consultation, please call us on 1300 228 377, book through the portal or fill in the form.
Meet The Author
Dr Rachel Korman
Specialist in Feline Internal Medicine
BVSc MANZCVS (Internal Medicine) FANZCVS (Feline Medicine)
Dr. Korman’s childhood love for cats led her to veterinary medicine, and early on, it was clear that feline care was her calling. After graduating from the University of Queensland in 2000, she worked in small animal and feline-only practices across Australia and the UK.
She received a Senior Clinical Training Scholarship from the Feline Advisory Bureau (now International Cat Care) at the University of Bristol, where she researched feline infectious and haematological diseases, and in 2018, became a Fellow of the Feline Medicine Chapter of the Australian New Zealand College of Veterinary Scientists and a registered Feline Medicine specialist.
Frequently Asked Questions
What is an insulin pen used for in cats?
An insulin pen is used to administer insulin to cats diagnosed with diabetes. The device delivers insulin subcutaneously, meaning under the skin.
Why do veterinarians recommend insulin pens?
Insulin pens provide more precise dosing and can be easier for owners to handle. They are also designed to simplify the injection process.
What equipment is needed to use an insulin pen?
You will need the insulin pen, disposable pen needles and a sharps container for safe disposal. Alcohol swabs may also be used during preparation.
Where should insulin be injected in a cat?
Common injection sites include areas of loose skin such as the scruff of the neck or sides of the abdomen. Rotating injection sites helps maintain good insulin absorption.
Why is monitoring important for diabetic cats?
Monitoring blood glucose levels helps ensure the insulin dose is appropriate. Regular records allow veterinarians to adjust treatment if necessary.
Patient Stories
Our commitment to feline health is best seen in the stories of the cats we’ve had the privilege of treating. These journeys highlight the dedication, expertise and compassion that drive us.
Each patient faced unique challenges, and it was our honour to offer high-quality care and help them regain strength and happiness. We value the deep bonds with cats and their owners, knowing the difference we make in their lives.
Kitty, a lymphoma survivor
We first met Kitty after she was referred to CSS for the evaluation of a large intestinal mass
Poppi finds her feet again
Following surgery to remove a hairball obstruction, Poppi was referred to us at CSS as she had not bounced back as expected
Rusty and his ongoing chronic rhinitis journey
Lifelong nasal issues, including persistent discharge and breathing noise, have been a bit of a thorn in Rusty’s side.
Lando’s long game with cryptococcus
Lando was referred to CSS because he had a swelling under his jaw that wouldn’t go away.
Popeye coughs up the culprit
Ares is a handsome young Maine Coon who was referred to CSS after presenting at AES with sudden lameness in his back leg.
Key Takeaways
These devices provide precise dosing and can be easier to use than traditional syringes.
Different types of insulin require specific compatible insulin pens.
Careful preparation and correct injection technique help ensure accurate insulin delivery.
Cat Specialist Services Reviews 
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Tanya Bell
6 months ago
We transported our cat here from another animal hospital, as his condition was too complex for them. Our pet was given the highest quality of care, multiple investigations/procedures being able to be done at the one place a godsend. We were kept up to date frequently throughout his stay. All questions & options explained thoroughly. Being able to have private visits certainly helped us and our cat too. I would highly recommend Cat Specialist Services at Underwood. Amazing staff from reception, vet nurses, vets & specialists. Oh, and yes he is recovering wonderfully at home.
Melinda Cox
A month ago
So very happy we were asked to come here for advice for our NORBIT. He has had 2 x UTI blockages within weeks of each other since turning 6. Surgery seemed to be his only option and he didn’t feel it was very fair on him if we didn’t at least exhaust all other avenues first.
Dr Allison was very thorough in her tests and has let us know she would like to treat the cause of the problem. Great news.
It may lead to removal of crystals in his bladder if his diet doesn’t let him pass them naturally.
At least this surgery won’t be as severe at taking his penis off him – so as his fur parents – we are very happy with this.
We await further tests to see what’s in store for him.
NORBIT will now be a patient of the clinic as we are so far very happy with his treatment thus far.
Lesley Rosekrans
A month ago
Hi has only been a week since losing my beautiful Peaches but can’t thank Dr Cindy, Maree and Jackie enough for the tender care they gave her and they after care they gave me. I sincerely thank them and can’t recommend the Clinic highly enough they are such caring people. Peaches I’m happier times.
Madison McEwan
A month ago
I cannot thank the entire CSS team enough and especially Dr Cindy for the care they provided for our boy with a urinary blockage, and we will be taking both our cats here from now on. The clinic is exceptionally clean and calming compared to all other clinics we’ve been too, and all staff from the reception to the nurses/vets were so supportive during a stressful time. I knew from the first minute that I got to see him after he was transferred that he was in the best place, and that the staff genuinely care about their well-being and positive long term outcomes. We were given regular updates and full transparency, so much information including QR video codes on how to administer medications, along with print outs and emails about how to best help avoid future issues or recurrence. Our boy got to smooch on everyone and was beyond well looked after. Thank you again, you all made an incredibly stressful situation actually manageable and calming.
Astrid El Gamal
6 months ago
Dr Wan-Ju has been treating my baby since her first seizure in November 2025 and she has been fantastic.
Everybody at the clinic is so friendly and caring and I know my baby is in good hands.
Thank you team!
Deeba M
3 months ago
Dr Alison Jukes from CSS Underwood is an AMAZING feline physician. She is kind, professional, thorough and our cat is blessed to have her on his side. She even was able to save us money and invasiveness by being skilled to the level of doing ultrasound on two separate occasions without our cat needing to go under full sedation. Our other cat was recently seen by Dr Jukes as well, and she made sure our cat’s heart was ok. I also want to thank the lovely Jacqueline and Mairead from customer care. They are very kind each time I see them and call up. Sending thanks from our family, including Smokey and Floozy!
Judith Dionysius
A month ago
My whole experience with CSS was positive – from the first email I received giving lots of information regarding the process of radioactive iodine treatment to the expected costs, to checking my cat in for the treatment, boarding for 2 weeks after the treatment and picking her up to come home. They didn’t push for any tests that were not necessary.
Janelle Wieden
5 months ago
We never knew this service existed but we are very grateful we were referred to them. Our vet Cindy was really great, she made us feel at ease during a very stressful time. We got the sense straight away the Leo was in good hands. This service made us feel better knowing that they specialise is cats only. Would highly recommend their services
Georgia Carter
5 months ago
My Lani finished her I-131 treatment today and I am beyond impressed with the way she was looked after. I am by definition a neurotic pet owner and sending my fur child away for a week was seriously daunting.
I was given daily updates about how kitty was eating, toileting and behaving. This really put my mind at ease. Vets and vet nurses were so accomodating and allowed Lani to have her favourite foods from home prepared her favourite way.
Her vet was so thorough when explaining her treatment and condition to me.
The ladies at reception were so friendly and understanding.
I honestly cannot recommend this clinic enough and I am so thankful for the positive experience Lani and I have had.
Lauren Woodward
A year ago
My sweet ginger boy Louis was hospitalised at CSS for a Urinary Obstruction. Dr Cindy and all the reception staff were amazing and empathetic. I would often ring up with questions post procedure and Dr Cindy would make time to talk and explain things to me
Service Locations
Cat Specialists accepts referrals for cats across Brisbane and surrounding regions, working closely with local veterinary clinics to provide specialist diagnosis, treatment, and ongoing management.
Contacting Us
Pet Owners
If you would like to talk about treatment for your cat, call us on 1300 228 377 or fill in the form.
In an emergency, please contact your local vet.
Vets and Nurses
To refer a patient or book a telehealth consultation please call us on 1300 228 377, book through the portal or fill in the form. For advice calls, please see the guidelines here.
Monday-Friday: 8 am-6 pmSaturday/Sunday - Closed