Progesterone Injectable

Giving your pet an injection might feel intimidating at first, but with practice, it becomes routine. Follow these steps for safe and stress-free injections.

Get Your Supplies Ready

1. Medication vial or pre-filled syringe
2. Alcohol swabs
3. Sterile syringe & needle (if not pre-filled)
4. Sharps container for safe needle disposal

Drawing Up the Dose (if needed)

1. Clean the vial top with an alcohol swab
2. Attach needle to syringe
3. Pull in air equal to the dose
4. Insert needle into vial, push air in
5. Draw out the correct dose
6. Tap out air bubbles

Pick the Injection Site

1. Subcutaneous (under the skin): Loose skin between shoulder blades or side
2. Intramuscular (into muscle): As directed by your vet

Prep the Area

1. Pinch a fold of skin to form a “tent” (for subcutaneous). Wipe with alcohol if recommended.

Inject the Medication

1. Hold the syringe like a pencil
2. Insert the needle into the base of the skin tent at a 45° angle
3. Push the plunger slowly to inject

After the Injection

1. Remove the needle smoothly
2. Place it immediately in the sharps container (don’t recap)
3. Pat the area and give your pet praise or a treat

Safety Tips

1. Never reuse needles
2. Always dispose of used needles properly
3. Ask your vet for help if unsure

The uses and pharmacology described below reflect the FDA-approved labeling for this active ingredient; your veterinarian determines whether and how they apply to your animal's treatment plan.

Veterinarians most commonly consider progesterone when a female patient requires exogenous hormonal support to maintain a favorable uterine environment for a developing fetus. It is frequently a point of discussion for mares with a history of early embryonic loss or those exhibiting low natural progesterone levels during gestation. In other clinical settings, progesterone may be evaluated in the context of synchronizing heat cycles or managing certain behavioral concerns associated with hormonal fluctuations. By providing a consistent source of this hormone, your veterinarian can monitor the patient's reproductive status and support physiological stability during critical windows of breeding management.

At a pharmacological level, progesterone acts by binding to specific nuclear receptors within target tissues, particularly the uterus and mammary glands. Once bound, it modulates the transcription of genes that prepare the endometrium for implantation and subsequently maintain the quiescent state of the uterine muscle (myometrium) during pregnancy. This inhibitory effect on uterine contractions is a key mechanism your veterinarian considers when pregnancy maintenance is the goal. Additionally, progesterone exerts feedback on the hypothalamus and pituitary gland, influencing the secretion of gonadotropins which regulates the progression of the estrus cycle. Your veterinarian will determine the most appropriate delivery method—such as an injectable oil-based solution or a compounded topical—based on the species and the specific reproductive objective.

Prescription only. Use only under the direction of a licensed veterinarian. This information is not a substitute for veterinary diagnosis, prescribing or monitoring. Compounded drugs are not approved by the FDA for safety or effectiveness.

Commonly observed effects of Progesterone administration include localized site reactions at the point of injection, such as swelling, heat or muscle soreness, particularly with oil-based formulations. Some owners may observe transient changes in behavior, increased appetite or mild lethargy shortly after administration. Because progesterone influences the mammary system, your veterinarian will monitor for changes such as mammary gland enlargement or, in rare instances, the development of mammary tumors in susceptible small animal patients. If you observe significant swelling at an injection site, persistent behavioral changes or any unusual mammary development, contact your veterinarian promptly.

This medication is typically used with caution or avoided in patients with known liver impairment, as the liver is responsible for the metabolic processing of steroid hormones. It is also carefully evaluated in patients with a history of mammary neoplasia or uterine disease, such as pyometra in dogs and cats, as exogenous progestins can influence the progression of these conditions. Before beginning a protocol involving progesterone, ensure your veterinarian has a complete history of all other prescriptions and supplements your pet is receiving. Your veterinarian will provide specific guidance on the duration of use and any necessary diagnostic follow-ups to ensure the management approach remains suitable for your pet's health status.