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Clamoxyl LA 150 mg/ml Injection


Prescription Medicine
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Clamoxyl Long Acting 150 mg/ml Suspension for Injection is an off-white oily suspension containing 150 mg/ml amoxicillin as Amoxicillin trihydrate.

The formulation is designed to provide effective antibiotic activity over a period of 48 hours.


Clamoxyl is a broad spectrum semi-synthetic penicillin which is bactericidal in vitro, against a wide range of Gram-positive and Gram-negative bacteria, including the following:



Actinobacillus lignieresi

Bacillus anthracis

Bordetella bronchiseptica

Clostridium spp.

Escherichia coli

Corynebacterium spp.

Fusobacterium spp.

Erysipelothrix rhusiopathiae

Haemophilus spp.

streptococci and staphylococci (penicillin sensitive strains)

Moraxella spp.


Pasteurella spp.


Proteus mirabilis


Salmonella spp.


Clamoxyl Long Acting Suspension for Injection is suitable for the control of infections caused by susceptible organisms in sheep, dogs and cats where prolonged activity from a single injection is required. It may also be used to control secondary bacterial invasion in conditions where bacteria are not a primary cause of disease.

Particular indications for Clamoxyl L.A. Injection are:

1.Alimentary tract infections, including enteritis.

2.Respiratory tract infections.

3.Urogenital tract infections, including cystitis and metritis.

4.Skin and soft tissue infections, including wounds, abscesses, foot infections, joint and navel ill.

5.Prevention of post-operative infections by injection prior to surgery.

Dosage and administration

The recommended dosage rate is 15 mg/kg bodyweight, which is equivalent to 1 ml/10 kg. If necessary, the dose may be repeated after 48 hours.

The following is intended as a guide



weight (kg)

Dose (volume)



6.5 ml



1.0 ml

Dog – large


3.5 ml

– medium


2.0 ml

– small


1.0 ml



0.5 ml


Shake the vial well before use. Inject by the subcutaneous or intramuscular route (dogs and cats) or the intramuscular route only (sheep), then massage the injection site. (For ease of administration in dogs and cats, needles no finer than 20 gauge should be used). If the volume to be given is greater than 5 ml (sheep) it should be divided and injected into two separate sites. The suspension is not suitable for intravenous or intrathecal administration.

In common with other penicillin preparations, hydrolysis takes place rapidly in the presence of water. It is important, therefore, that a dry syringe is used when extracting suspension for injection, to avoid contaminating the remaining contents of the vial with drops of water. Do not broach the vial more than 40 times.

Contra-indications, warnings, etc

Use of the product should be based on susceptibility testing of the bacteria isolated from the animal. If this is not possible, therapy should be based on epidemiological information.

In common with all other penicillins, amoxicillin should not be used orally or parenterally in rabbits, guinea pigs, hamsters or gerbils. Caution is advised in its use in any other very small herbivores.

Use of the product may occasionally result in local tissue reaction.

Withdrawal periods

Sheep meat: 45 days

Not for use in sheep producing milk for human consumption.

Operator warnings

Care should be taken to avoid accidental self-injection.

Penicillins and cephalosporins may cause hypersensitivity (allergy) following injection, inhalation, ingestion or skin contact. Hypersensitivity to penicillins may lead to cross-reactions to cephalosporins and vice versa. Allergic reactions to these substances may occasionally be serious.

Do not handle this product if you know you are sensitised, or if you have been advised not to work with such preparations.

Handle this product with great care to avoid exposure, taking all recommended precautions.

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.

Wash hands after use.

Pharmaceutical precautions

Do not store above 25°C.

This product does not contain an antimicrobial preservative. Following withdrawal of the first dose, use the product within 28 days. Discard unused material.

Any unused product or waste materials should be disposed of in accordance with local requirements.

Keep out of the reach of children.

For animal treatment only.

Legal category


Packaging Quantities

Clamoxyl Long Acting Suspension for Injection is available in packs containing 6 x 100 ml and 4 × 250 ml vials.

ARE THERE ANY KNOWN SIDE EFFECTS Please speak to the prescribing veterinary surgeon -- How long does it take to become effective once injected? As this is a prescription only medicine, please consult your veterinary surgeon.


Shipping charges mainland GB zone1

Value Weight Delivery Charge
Over £49.00 Any Weight FREE
Under £49.00 No weight limit £4.50
Under £49.00 Under 250 grams £3.49

Most orders are despatched the same day and standard delivery is 3 to 5 working days from despatch. FAST Expedited options are available at extra cost - these usually arrive in 24-48hrs from dispatch but delays are possible during busy periods.

Postcodes outside of Zone 1 (including some areas within mainland UK) may incur extra carriage charges due to surcharges imposed by the couriers. These will be calculated on the website at the checkout. 

NB: Orders placed with faster delivery must be placed before 13:00 to ensure same day dispatch (excluding weekends and bank holidays). Please also check on the product page that the items ordered show 'In Stock' otherwise your order will be delayed until the stock becomes available, which in most cases will only be 24hrs.

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

Overseas orders

We no longer send goods outside of the UK.

Prescription Items

Prescription items will be sent on receipt of a legally valid signed and dated prescription.

Pick up

We offer a pickup service for orders placed over the phone.

Please ring us on 01833 641112 for more information.

Refrigerated Items

  • Refrigerated lines Packaging Cost: Despatched with Woolcool Refrigerated Packaging for £7.50.
Wool cool keeps pharmaceutical products at fridge-like, ambient, or even freezing temperatures for up to 72 hours, and possibly longer depending on the contents and use of ice packs.
Important Delivery Information:
  • Receipt Required: Someone must be available to receive the delivery. Woolcool packaging is designed for temperature-controlled goods, so parcels cannot be left unattended.
  • Immediate Refrigeration: Upon receipt, refrigerate the contents immediately to ensure your food or medicine remains at the correct temperature.
  • Failed Delivery Attempts: We are not responsible for the cost of replacements if a delivery attempt fails due to the absence of someone to receive it.

We want you to be completely satisfied with any purchase. If not any item* can be returned to us within 14 days of receipt for exchange or refund Please give us a ring for a returns number on 01833 641112 or alternatively email sales@hyperdrug.co.uk to obtain a returns number.

*Due to legal requirements medicines may not be returned except to correct an error in despatch or in response to an "official recall". If an item is believed to be faulty it should be returned for inspection and it may be necessary to forward it to the manufacturers for testing before replacements or refunds can be authorised. This does not infringe legal rights. Please contact our customer services for a "Returns Number" which must appear on the outside of the package or it will not be accepted. We advise customers to use an insured method of shipping and to retain proof of despatch. We may refuse returns on products specially obtained or manufactured to order. Items must be returned unsoiled and unused and sent adequately packed and carriage paid.

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Clamoxyl Ready-to-Use 150 mg/ml suspension for injection. Clamoxyl RTU is indicated for the treatment of infections in dogs, cats, sheep, pigs and cattle, caused by amoxicillin sensitive organisms.
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