Control of Oestrus (Heat)
Why has my veterinarian prescribed this medicine?
Several products are available for the prevention or postponement of oestrus (heat, seasons) in female dogs.
Hormonal control of oestrus is not recommended before the first season, in dogs with a history of vaginal discharge, false pregnancy, or irregular heat periods.
It is important that your pet should have a normal oestrus every 18 to 24 months. It is often difficult to predict when your pet will come into oestrus after the medication is stopped. Continual hormonal control of oestrus may cause side effects in your pet. If your pet is not intended for breeding, think about having your pet spayed (sterilised, neutered).
How do I give this medication?
- Depending on the medication, your veterinarian will administer this medicine by injection to your pet or the medication can be given by mouth.
- A course of treatment will be required.
How do I store this medicine?
- Tablets should be stored out of reach of children, in a cool, dry place at room temperature. Do not store tablets in the bathroom, near the kitchen sink or in damp places.
Potential side effects
- Tell your veterinarian if your pet is diabetic.
- Your pet may experience irritation at the site of the injection and there may be a change of coat colour at the site of injection.
- Potential side effects with these types of medicines include mammary changes, uterine infection (pyometra), increased appetite, increased thirst, increased urination, personality changes (increased libido), and changes in hair colour. If these effects are seen, contact your veterinarian.
- Your pet may have abnormal oestrus cycles or come into season earlier than expected after the medication is stopped.
- Other side effects may occur. If the pet experiences anything unusual, contact your veterinarian.
Possible drug interactions
- Make sure to tell your veterinarian what other medication you are giving to your pet.
- Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.
© Copyright 2025 LifeLearn Inc. Used and/or modified with permission under license. This content written by LifeLearn Animal Health (LifeLearn Inc.) is licensed to this practice for the personal use of our clients. Any copying, printing or further distribution is prohibited without the express written consent of LifeLearn. This content does not contain all available information for any referenced medications and has not been reviewed by the FDA Center for Veterinary Medicine, or Health Canada Veterinary Drugs Directorate. This content may help answer commonly asked questions, but is not a substitute for medical advice, or a proper consultation and/or clinical examination of your pet by a veterinarian. Please contact your veterinarian if you have any questions or concerns about your pet’s health. Created on Jul 26, 2015.
