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Injections for cat birth control: Are they safe and effective?

Updated On September 23rd, 2025

Pet's info: Cat | Scottish Fold | Female | 6 months and 14 days old

My cat is almost 7 months old and soon will start to reproduce. I do not want her to have kids or get her spayed. After doing some research, I learned that there is some kind of injection I could give her every few months to stop her from reproducing. Can you please give me more info. about this injection? How do they work? What are their benefits & side effects, and so on... I am interested in giving her these her injections but I am not going to give her anything I am not sure about. Thankyou!

2 Answers

Most Helpful Answer

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Answered By Joy Fuhrman, DVM, MBA, CPA

Veterinarian

Published on April 12th, 2017

There are a number of newer non-surgical contraception options for cats and dogs including Gonazon, Suprelorin, Neutersol, Esterilsol, and Infertile. However, many of these drugs are still undergoing testing for safety and efficacy. As a result they are only available in certain countries. As more research is done in this area, more reliable drugs are likely to come to market.

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    Answered By Jacqueline Nobles, DVM, DACVECC

    Veterinarian, Board-Certified Emergency/Critical Care Specialist

    Published on

    The injections you are referring to are typically steroid hormones which may lead to a uterine infection known as a pyometra. In the event that occurs, the recommended therapy is an ovariohysterectomy. As a side note, she will be at increased risk for mammary cancer if left intact. I do not recommend the injections. I do recommend spaying. If you choose not to spay your cat, please do not allow her to mate so she can avoid reproducing.

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