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POM-V Prescription Required Companion Animal

Prilactone Next 10 mg Chewable Tablets for Dogs

Active ingredient: Spironolactone

Form

Chewable

Species

Dogs

Manufacturer

Ceva Sante Animale

VMD MA No.

14966/3087

What it's used for

For use in combination with standard therapy (including diuretic support, where necessary) for the treatment of congestive heart failure caused by degenera...

Full indications, dosage and side effects ↓
View official SPC (PDF)

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Paying less for Spironolactone

  1. 1

    Ask your vet for a written prescription

    They must provide one on request. Under the CMA Order the fee is capped at £21 from 2027.

  2. 2

    Fill it at a registered online retailer

    The CMA found online pharmacies 50–60% cheaper than practice dispensing on common medicines — typically £200–£300 a year.

Prescription required

Your vet must provide a written prescription on request. You can then purchase from any licensed online retailer.

Clinical information

Prilactone Next 10 mg Chewable Tablets for Dogs — SPC Details

Source: VMD Summary of Product Characteristics (SPC). Last updated 27 Mar 2026.

For use in combination with standard therapy (including diuretic support, where
necessary) for the treatment of congestive heart failure caused by degenerative mitral
valve disease in dogs.
2 mg of spironolactone per kg of body weight once daily, i.e. 1 tablet per 5 kg of body
weight.
The product should be administered with meal.
Dog weight
(kg)
Prilactone Next 10 mg
Number of tablets per
day
> 1 to 2.5½ > 2.5 to 51> 5 to 7.51 ½ > 7.5 to 102
To ensure a correct dosage, body weight should be determined as accurately as
possible.
The tablets are flavoured. If the dog does not accept the tablet from hand or bowl,
then the tablets may be mixed with a small amount of food offered prior to the main
meal, or administered directly into the mouth after feeding.
Do not use in animals used for or intended for use in breeding.
Do not use in dogs suffering from hypoadrenocorticism, hyperkalaemia or
hyponatraemia.
Do not administer spironolactone in conjunction with NSAIDs to dogs with renal
insufficiency.
Do not use in cases of hypersensitivity to spironolactone or any of the excipients.
See section 3.7.
Dogs :
Very common
(>1 animal / 10 animals
treated):
Prostatic atrophy
Common
(1 to 10 animals / 100 animals
treated):
Vomiting, Diarrhoea
in entire male dogs, reversible
Reporting adverse events is important. It allows continuous safety monitoring of a
veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to
either the marketing authorisation holder or the national competent authority via the
national reporting system. See the package leaflet for respective contact details.
None

Special precautions for safe use in the target species:
Kidney function and plasma potassium levels should be evaluated before initiating
combined treatment with spironolactone and ACE inhibitors. Unlike in humans, an
increased incidence of hyperkalaemia was not observed in clinical trials performed in
dogs with this combination. However, in dogs with renal impairment, regular
monitoring of renal function and plasma potassium levels is recommended as there
may be an increased risk of hyperkalaemia.
Dogs treated concomitantly with spironolactone and NSAIDs should be correctly
hydrated. Monitoring of their renal function and plasma potassium levels is
recommended before initiation and during treatment with combined therapy (see 3.3).
As spironolactone has an antiandrogenic effect, it is not recommended to administer
the product to growing dogs.
As spironolactone undergoes extensive hepatic biotransformation, care should be
taken when using the product to treat dogs with hepatic dysfunction.
The chewable tablets are flavoured. In order to avoid accidental ingestion, store
these tablets out of the reach of animals.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals:
The product may cause skin sensitisation. Persons known to be allergic to
spironolactone or other components of the final formulation should not handle this
product.
Handle this product with great care to avoid unnecessary exposure, taking all
recommended precautions.
Wash hands after use.
If you develop symptoms following exposure such as a skin rash, you should seek
medical advice and show the doctor this warning. Swelling of the face, lips or eyes or
difficulty with breathing are more serious symptoms and require urgent medical
attention.
In case of accidental ingestion, seek medical advice immediately and show the
package leaflet or the label to the physician.
Special precautions for the protection of the environment:
Not applicable.
In clinical studies, the product was co-administered with ACE-inhibitors, furosemide
and pimobendan without evidence of associated adverse reactions.
Spironolactone decreases digoxin elimination and hence raises digoxin plasma
concentration. As the therapeutic index for digoxin is very narrow, it is advisable to
monitor closely dogs receiving both digoxin and spironolactone.
The administration of either deoxycorticosterone or NSAIDs with spironolactone may
lead to a moderate reduction of the natriuretic effects (reduction of urinary sodium
excretion) of spironolactone.
Concomitant administration of spironolactone with ACE-inhibitors and other
potassium-sparing drugs (as angiotensin receptor blockers, ß-blockers, calcium
channels blockers, etc..) may potentially lead to hyperkalaemia (see 3.5).
Spironolactone may cause both induction and inhibition of cytochrome P450
enzymes and could therefore affect the metabolism of other drugs utilizing these
metabolic pathways.
This veterinary medicinal product does not require any special temperature storage
conditions.
Store in the original package.
Any part-used tablet should be returned to the opened blister and used within 24
hours.
Not applicable.
4.

This information is sourced from the official Summary of Product Characteristics (SPC) published by the Veterinary Medicines Directorate (VMD). It is provided for informational purposes only and does not replace professional veterinary advice. Always consult your vet before administering any medication.

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