Leucogen Immunisation Vaccine for Cats

Pictures are for illustration only.

Browse other products from the Virbac product range

Leucogen Immunisation Vaccine for Cats

Be the first to review this item

Item Number: LEUCOGEN 
Phone orders quick webcode: 

Select Product Option

Select one of the options below, then click 'Buy Now'

50 doses was £945.95 £931.69 Usually despatched within 1-3 working days
10 doses £204.15 Usually despatched within 48 hours


NB This is a prescription only medicine
How do I buy Prescription medicines from you?

  1. Obtain a Prescription from your vet
  2. Place your order online or by phone
  3. Either fax email* or post your prescription to us.
  4. “Controlled Drugs” such as Epiphen or Tramadol can be only be dispensed ofter receipt of an original valid prescription sent by post. Controlled Drugs must be sent via tracked, signature delivery and do not qualify for free delivery.
  5. **Unless your vet has stated that the original must be sent to us.
  6. Choose your delivery method. Either Royal Mail Special Delivery which operates a next working day service, requiring a signature(Our recommended option). Or First class post which is free, but at your own risk, and is usually next working day but may take longer.
  7. Hyperdrug Pharmaceuticals Ltd, Middleton In Teesdale, Barnard Castle, County Durham, DL12 0NG.

You are ordering items which require a prescription, Tampering with a prescription or attempting to obtain extra unauthorise supplies is a criminal offence and will have to be reported to the authorities. “Controlled Drugs” such as Epiphen or Tramadol can be only be dispensed ofter receipt of an original valid prescription sent by post. Controlled Drugs are sent via tracked, signature delivery.

  1. Place your order online or by phone
  2. Obtain a Prescription from your vet
  3. Either post the original, fax it to 01833 641032, or email it to us at [email protected]

 I have a prescription on file
 I am sending you a prescription by email
 I am sending you a prescription by fax
 I am sending you a prescription by post


Leucogen Immunisation Vaccine for Cats.

Leucogen is a feline leukaemia vaccine produced by genetic engineering methods. The vaccine contains the purified p45 FeLV envelope antigen, obtained by genetic recombination of a strain of E. coli. The p45 antigen represents a fraction of the virus envelope glycoprotein and induces the synthesis of protective antibodies.

The antigenic material is adjuvanted with an aluminium hydroxide gel and `Quil A', a purified derivative of saponin.


For the active immunisation of healthy unexposed cats from eight weeks of age against feline leukaemia for the prevention of persistent viraemia and clinical signs of the related disease. Onset of immunity is three weeks after primary vaccination. The duration of immunity is one year after the primary vaccination.

Dosage and administration

Shake the vial gently and inject contents of one vial (1 ml) of Leucogen vaccine subcutaneously using aseptic techniques.

Primary course vaccination

In cats of eight weeks and over, administer two doses of Leucogen 3 to 4 weeks apart. To protect kittens, the vaccination of female cats prior to mating is recommended. Maternally derived antibodies can negatively influence the immune response to vaccination. In such cases where maternally derived antibodies are expected, a third injection may be appropriate from 15 weeks of age.

Booster immunisation

Where cats are exposed to infection, a single dose of Leucogen is recommended annually to boost immunity to feline leukaemia; otherwise earlier re-vaccination may be required.

Contra-indications, warnings, etc

Only healthy cats, free of parasites, should be vaccinated. Prior to vaccination, it is advised that cats be checked for the presence of p27 circulating viral antigen, using the E.L.I.S.A. test. If the result of the test is positive, vaccination will not be effective.

A small transitory node at the site of injection has occasionally been observed in cats vaccinated with Leucogen; this reaction will disappear within 2 to 6 weeks without treatment.

In a small percentage of cats a transient malaise may be observed post vaccination. In very rare cases this may be accompanied by pyrexia, inappetence or vomiting. Symptoms should subside within 24–48 hours.

The vaccination of pregnant queens is not recommended. Use is not recommended during lactation.

Safety and efficacy data are available which demonstrate that this vaccine can be mixed with FELIGEN RCP.

In case of accidental self-injection, seek medical advice immediately and show the package leaflet or the label to the doctor.

Pharmaceutical precautions

Do not freeze. The vaccine should be stored in the original package between +2°C and +8°C, and protected from light.

Do not mix with any other immunological product other than FELIGEN RCP.

Legal category



Free shipping from Hyperdrug

Value Weight Delivery Charge*  
Over £49.00 Any Weight FREE*
Under £49.00 Under 250g £2.49
Under £49.00 No weight limit £4.99

Most orders are despatched the same day and standard delivery is 3 to 5 working days from despatch. FAST Expedited delivery options are available.

Estimated " Usually shipped in" information is shown against most products


Overseas orders

Postage outside of the UK is from £4.95

Finding out delivery Charges and options before checkout

  1. Simply add an item to your basket
  2. Click view basket/Cart
  3. Click estimate shipping charges
*Free delivery and selected charges on orders over £49.00 mainland UK Parcelforce Zone1 for more information check the delivery info page.


Click here for the product datasheet