POM-V Prescription Required Companion Animal

Myodine 25 mg/ml Solution for Injection for Dogs and Cats

Active ingredient: Nandrolone Laurate

Form

Injection

Species

Cats Dogs

Manufacturer

Le Vet Beheer B.V.

VMD MA No.

41821/4040

What it's used for

Indicated for use in dogs and cats as an adjunctive treatment for conditions in which anabolic therapy is considered to be beneficial.

Full indications, dosage and side effects ↓

View official SPC (PDF)

The prescription itself has a price. See what practices near you charge for a consultation and the written prescription fee.

Paying less for Nandrolone Laurate

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

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.

Your prescription rights → VMD register of retailers →

Prescription required

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

Clinical information

Myodine 25 mg/ml Solution for Injection for Dogs and Cats — SPC Details

Source: VMD Summary of Product Characteristics (SPC). Last updated 26 Mar 2026.

Indicated for use in dogs and cats as an adjunctive treatment for conditions in which
anabolic therapy is considered to be beneficial.

For subcutaneous or intramuscular injection.
Dog and cat, 2-5 mg nandrolone laurate per kg bodyweight, corresponding to 0.08-
0.2 ml product per kg bodyweight.
For sustained anabolic therapy, treatment should be repeated every 3-4 weeks.
As with all hormone therapy, there can be considerable variation in response to
treatment. The dose should be adjusted according to clinical response.
Use a dry sterile needle and syringe to avoid the introduction of contamination during
use.

Do not use in pregnant animals (see also section 4.7).
Do not use in animals with hypercalcaemia.
Do not use in animals with androgenic dependent tumours.
Do not use in breeding animals.
Do not use in cases of hypersensitivity to the active substance or to any of the
excipients.

As with all oily solutions, injection site reactions may occur, which have been
reported very rarely in spontaneous reports. A strong abnormal urine odour in cats
has been reported very rarely in spontaneous reports.

Revised: June 2022
AN: 01476/2021 & 01478/2021
Possible adverse reactions of anabolic steroids in dogs and cats include retention of
sodium, calcium, potassium, water, chloride and phosphate; hepatotoxicity;
behavioural androgenic changes and reproductive disturbances (oligospermia,
oestrus suppression).
The frequency of adverse reactions is defined using the following convention:
- very common (more than 1 in 10 animals treated displaying adverse reaction(s))
- common (more than 1 but less than 10 animals in 100 animals treated)
- uncommon (more than 1 but less than 10 animals in 1,000 animals treated)
- rare (more than 1 but less than 10 animals in 10,000 animals treated)
- very rare (less than 1 animal in 10,000 animals treated, including isolated reports).

Anabolic therapy is to induce an improvement in clinical signs rather than a cure. The
animal should therefore be carefully examined for potential pre-existing disease and
the anabolic therapy should be combined with treatment of this underlying disease, if
present.

Revised: June 2022
AN: 01476/2021 & 01478/2021

Special precautions for use in animals
This product contains benzyl alcohol, which has been documented to cause adverse
reactions in neonates. For this reason, use of the product is not recommended in
very young animals.
Special care (particularly in geriatric patients) should be taken when administering
the product to animals with compromised cardiac or renal function because of the
potential of anabolic steroids to increase sodium and water retention.
The product should be administered with caution to animals with severe hepatic
dysfunction. The liver function of treated animals should be monitored. Complications
(e.g. oedema) may occur when administering the product to animals with pre-existing
cardiac, renal or hepatic disease, in this case treatment must be stopped
immediately.
Special care should be taken when administering the product to young (growing)
animals, since androgens may accelerate epiphyseal closure.
Prolonged administration may cause signs of the androgenic activity to appear,
especially in entire female animals.
Steroids may improve glucose tolerance and decrease the need for insulin or other
anti-diabetic drugs. Therefore diabetic animals should be monitored carefully and
dose adjustment of anti-diabetic drugs might be necessary.
Special precautions to be taken by the person administering the veterinary medicinal
product to animals
In the event of accidental self-injection, transient painful, local reactions may occur.
Avoid accidental self-injection. In the case of accidental self-injection, seek medical
advice and show the package leaflet or the label to the physician.
This product contains benzyl alcohol and can cause skin irritation. Avoid contact with
skin. In the case of contact with skin, wash with soap and water. If irritation persists,
seek medical advice. Wash hands after use.
The product can cause eye irritation. Avoid contact with eyes. If the product comes
into contact with the eyes, rinse the eyes immediately with plenty of water and seek
medical attention if irritation persists.
Virilisation of the foetus may occur if pregnant women are exposed to the product.
Therefore, the veterinary medicinal product should not be administered by pregnant
women or women trying to conceive.
This product may cause hypersensitivity reactions. People with known
hypersensitivity to nandrolone, benzyl alcohol or arachis oil (peanut oil) should avoid
contact with the veterinary medicinal product.
If you develop symptoms following exposure such as a skin rash, you should seek
medical advice and show the physician this warning. Swelling of the face, lips or eyes
or difficulty with breathing are more serious symptoms and require urgent medical
attention.

Anabolic steroids may potentiate the effects of anticoagulants.
The concurrent administration of anabolic steroids with ACTH or corticosteroids may
enhance oedema formation.

Keep the vial in the outer carton in order to protect from light. At low temperatures the
product may become viscous and turbid. Warming the vial in the hand will return the
contents to the normal state.

Not applicable.
5.

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.