Product Information

Description

Product details

Finasteride is a 5-alpha-reductase inhibitor used to treat benign prostatic hypertrophy (BPH, or enlarged prostate) in dogs and ferrets. This product is a tablet formulation.

Used to treat benign prostatic hypertrophy (BPH) in dogs.
Can also be used to treat BPH and adrenal disease in ferrets.
Do not use this medication in sexually developing animals or sexually mature female animals.
Caution: wear gloves or avoid handling this medication if you are pregnant, nursing, or planning to become pregnant.
While this drug does not have an FDA-approved indication for all animal uses, it is commonly accepted for veterinarians to prescribe this medication for use in animals.

*Please note: This is a generic medication. Product packaging and appearance, including size, color, and shape, may differ from the description or images provided and are subject to manufacturer availability.

Product sourced directly from the manufacturer or their approved distributor. Guaranteed genuine product backed by the manufacturer.

For

Dogs and Ferrets

Active ingredient(s)

Finasteride

Common brand names

Proscar, Propecia

Drug class

5-alpha-reductase inhibitor

Product strength & size

Finasteride tablets may be available in multiple strengths and/or sizes. Please ensure the selected product and package size are appropriate for your pet, as recommended by your veterinarian.

For current availability, please refer to the product selection above.

Usage

Finasteride Tablets should be given orally as directed by your veterinarian. Please consult your veterinarian before making any changes or discontinuing the prescribed dosing schedule.

This medication may take several weeks to reach its full benefit. Try to give this medication consistently as instructed and avoid missing any doses.

This medication can be given with or without food. If your pet vomits or appears unwell after receiving a dose on an empty stomach, give future doses with food or a small treat. If vomiting continues, contact your veterinarian.

If you are pregnant, planning, or breastfeeding: wear gloves before handling this medication. All pet owners should wash their hands with soap and water after handling (even if gloves are worn).

Missed doses

Administer the dose as soon as possible. If it is almost time for the next dose, skip the missed dose and continue with the regular schedule. Do not give two doses at once.

Storage

Store in a cool, dry place at a controlled room temperature (68 to 77°F, brief excursions permitted between 59 and 86°F). Keep in a tight, light-resistant container and out of the reach of children and pets. Store away from heat and direct sunlight. Do not store in the bathroom, near the kitchen sink, or in damp places. The medicine may break down if exposed to heat or moisture.

Side effects

This medication appears to be generally well tolerated in dogs, though data in animals is limited. Possible side effects include (but may not be limited to) vomiting, diarrhea, and decreased appetite.

Notify your veterinarian if your pet experiences any of the effects described above, or if you notice any other side effects that are persistent or troublesome.

If you notice anything unusual, please consult your veterinarian.

Precautions

Do NOT use this medication in sexually developing animals and sexually mature, pregnant, or nursing females.

Use with caution in animals with significant liver impairment/disease.

Do not administer to animals with a known history or suspected allergy/hypersensitivity to this medication or any of its ingredients. Allergic reactions to medications may occur. Be sure to inform Vetsource and your veterinarian if your pet has any known drug sensitivities or allergies.

If your pet displays symptoms of an allergic reaction, discontinue therapy and call your veterinarian immediately or seek emergency veterinary attention. Symptoms may include (but are not limited to): swollen lips, tongue, face, or airways; difficulty breathing; agitation; profuse salivation; and widespread hives or itching.

Human exposure warning

This medication is classified as hazardous due to potential risks to individuals who are actively trying to conceive, as well as to women who are pregnant, breastfeeding, and those who may become pregnant. If you are in one of these groups, avoid handling this medication or exercise EXTREME CAUTION if handling is necessary.

If handling is necessary for pregnant, planning, or breastfeeding women: wear gloves while handling or administering this medication. All pet owners should wash their hands thoroughly with soap and water after handling the medication or if contact is made with the bodily fluids (e.g., vomit) of a treated animal, even if gloves are worn.

Do NOT cut, crush, or otherwise manipulate tablets, as this creates airborne particles that can be inhaled. Inhalation of these particles may pose similar exposure risks to direct handling or accidental contact with the medication.

Drug and food interactions

The following drugs* may have potential interactions with this medication: azole antifungals (e.g., itraconazole, ketoconazole), diltiazem, and testosterone.

*NOTE: this may not be a comprehensive list. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.

Please ensure your veterinarian is aware of all medications and supplements that your pet is currently receiving. Your veterinarian may prescribe multiple medications, even if a potential drug interaction may occur. In these instances, your veterinarian may adjust the dosages or monitor your pet more closely.

Adverse reactions

If you are concerned that your pet has experienced an adverse reaction to this medication, please contact Vetsource Pet Owner Care at 877-738-4443.

Overdose

If you have any reason to suspect an overdose, call your doctor/veterinarian or the appropriate poison control resource immediately.

For humans:

The national toll-free Poison Help line, 1-800-222-1222, will connect you to your local poison center in case of emergency. This service is available nationwide and in most U.S. territories.

For animals:

The ASPCA Animal Poison Control Center is available 24 hours a day, 365 days a year at 888-426-4435.

Pet Poison Helpline® also provides a 24/7 animal poison control service at 855-764-7661.

*Please note: this information is for third-party services and is provided for convenience in case of potential poison-related emergencies. There may be consultation fee for these services.

Disclaimer

The content provided on this page is NOT medical advice.

All content, including the images and product description above, is intended for general informational purposes only and should not be considered a substitute for professional veterinary consultation, diagnosis, or treatment.

Consult your veterinarian for complete information about this product and how it fits into your pet's individual treatment plan.

Last revised: 7/02/2025

Description
Product details
Finasteride is a 5-alpha-reductase inhibitor used to treat benign prostatic hypertrophy (BPH, or enlarged prostate) in dogs and ferrets. This product is a tablet formulation.
- Used to treat benign prostatic hypertrophy (BPH) in dogs.
- Can also be used to treat BPH and adrenal disease in ferrets.
- Do not use this medication in sexually developing animals or sexually mature female animals.
- Caution: wear gloves or avoid handling this medication if you are pregnant, nursing, or planning to become pregnant.
- While this drug does not have an FDA-approved indication for all animal uses, it is commonly accepted for veterinarians to prescribe this medication for use in animals.
*Please note: This is a generic medication. Product packaging and appearance, including size, color, and shape, may differ from the description or images provided and are subject to manufacturer availability.

Product sourced directly from the manufacturer or their approved distributor. Guaranteed genuine product backed by the manufacturer.

For
Dogs and Ferrets

Active ingredient(s)
Finasteride

Common brand names
Proscar, Propecia

Drug class
5-alpha-reductase inhibitor

Product strength & size
Finasteride tablets may be available in multiple strengths and/or sizes. Please ensure the selected product and package size are appropriate for your pet, as recommended by your veterinarian.
For current availability, please refer to the product selection above.

Usage
Finasteride Tablets should be given orally as directed by your veterinarian. Please consult your veterinarian before making any changes or discontinuing the prescribed dosing schedule.
This medication may take several weeks to reach its full benefit. Try to give this medication consistently as instructed and avoid missing any doses.

This medication can be given with or without food. If your pet vomits or appears unwell after receiving a dose on an empty stomach, give future doses with food or a small treat. If vomiting continues, contact your veterinarian.

If you are pregnant, planning, or breastfeeding: wear gloves before handling this medication. All pet owners should wash their hands with soap and water after handling (even if gloves are worn).

Missed doses
Administer the dose as soon as possible. If it is almost time for the next dose, skip the missed dose and continue with the regular schedule. Do not give two doses at once.

Storage
Store in a cool, dry place at a controlled room temperature (68 to 77°F, brief excursions permitted between 59 and 86°F). Keep in a tight, light-resistant container and out of the reach of children and pets. Store away from heat and direct sunlight. Do not store in the bathroom, near the kitchen sink, or in damp places. The medicine may break down if exposed to heat or moisture.

Side effects
This medication appears to be generally well tolerated in dogs, though data in animals is limited. Possible side effects include (but may not be limited to) vomiting, diarrhea, and decreased appetite.

Notify your veterinarian if your pet experiences any of the effects described above, or if you notice any other side effects that are persistent or troublesome.
If you notice anything unusual, please consult your veterinarian.

Precautions
Do NOT use this medication in sexually developing animals and sexually mature, pregnant, or nursing females.

Use with caution in animals with significant liver impairment/disease.

Do not administer to animals with a known history or suspected allergy/hypersensitivity to this medication or any of its ingredients. Allergic reactions to medications may occur. Be sure to inform Vetsource and your veterinarian if your pet has any known drug sensitivities or allergies.
If your pet displays symptoms of an allergic reaction, discontinue therapy and call your veterinarian immediately or seek emergency veterinary attention. Symptoms may include (but are not limited to): swollen lips, tongue, face, or airways; difficulty breathing; agitation; profuse salivation; and widespread hives or itching.

Human exposure warning
This medication is classified as hazardous due to potential risks to individuals who are actively trying to conceive, as well as to women who are pregnant, breastfeeding, and those who may become pregnant. If you are in one of these groups, avoid handling this medication or exercise EXTREME CAUTION if handling is necessary.
If handling is necessary for pregnant, planning, or breastfeeding women: wear gloves while handling or administering this medication. All pet owners should wash their hands thoroughly with soap and water after handling the medication or if contact is made with the bodily fluids (e.g., vomit) of a treated animal, even if gloves are worn.

Do NOT cut, crush, or otherwise manipulate tablets, as this creates airborne particles that can be inhaled. Inhalation of these particles may pose similar exposure risks to direct handling or accidental contact with the medication.

Drug and food interactions
The following drugs* may have potential interactions with this medication: azole antifungals (e.g., itraconazole, ketoconazole), diltiazem, and testosterone.
*NOTE: this may not be a comprehensive list. Contact your veterinarian if your pet experiences any unusual reactions when different medications are given together.

Please ensure your veterinarian is aware of all medications and supplements that your pet is currently receiving. Your veterinarian may prescribe multiple medications, even if a potential drug interaction may occur. In these instances, your veterinarian may adjust the dosages or monitor your pet more closely.

Adverse reactions
If you are concerned that your pet has experienced an adverse reaction to this medication, please contact Vetsource Pet Owner Care at 877-738-4443.

Overdose
If you have any reason to suspect an overdose, call your doctor/veterinarian or the appropriate poison control resource immediately.

For humans:
The national toll-free Poison Help line, 1-800-222-1222, will connect you to your local poison center in case of emergency. This service is available nationwide and in most U.S. territories.

For animals:
The ASPCA Animal Poison Control Center is available 24 hours a day, 365 days a year at 888-426-4435.
Pet Poison Helpline® also provides a 24/7 animal poison control service at 855-764-7661.

*Please note: this information is for third-party services and is provided for convenience in case of potential poison-related emergencies. There may be consultation fee for these services.

Disclaimer
The content provided on this page is NOT medical advice.
All content, including the images and product description above, is intended for general informational purposes only and should not be considered a substitute for professional veterinary consultation, diagnosis, or treatment.
Consult your veterinarian for complete information about this product and how it fits into your pet's individual treatment plan.

Last revised: 7/02/2025
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