Amfipen LA 100mg/ml Antibiotic Injection

Amfipen LA 100mg/ml Antibiotic Injection
80ml Bottle

  • 80ml Bottle £13.99


Amfipen LA 100mg/ml is an injectable antibiotic containing ampicillin in a formulation designed to give at least 48 hours cover from a single injection. It can be used in dogs, cats, cattle, pigs and sheep for infections sensitive to ampicillin. It is not suitable for use in horses due to the localised reaction which develops around the injection site. It should not be used in small herbivores due to the risk of serious digestive upset.


A sterile non-aqueous suspension containing 100 mg ampicillin (as Anhydrous Ampicillin) per ml, with aluminium stearate producing a prolongation of antibiotic activity for at least 48 hours following injection. Also contains Dodecyl Gallate 87.5 mg/ml as an antioxidant.


The treatment of diseases or secondary infections due to the following bacteria sensitive to ampicillin in dogs, cats, cattle, pigs and sheep and where prolongation of activity from a single injection is required: Streptococcus spp., Actinomyces pyogenes, Mannheimia haemolytica, Pasteurella multocida, Erysipelothrix rhusiopathiae, Staphylococcus aureus and Staphylococcus spp.

Dosage and administration

Cattle and sheep 15 mg per kg bodyweight, pigs 25 mg per kg bodyweight, by intramuscular injection.

Dogs 15 mg per kg bodyweight, cats 20 mg per kg bodyweight, by subcutaneous injection.


500 kg

75   ml


50 kg

7.5 ml


50 kg

12.5 ml


10 kg

1.5 ml


5 kg

1  ml

Clean the area of the injection site and swab with spirit. Do not use the same injection site more than once during a course of treatment.

Do not administer more than 10 ml per injection site in pigs and sheep and 20 ml in cattle.

Treatment may be repeated once after 48 hours.

Contra-indications, warnings, etc

This product is not effective against beta-lactamase producing organisms.

Do not administer to animals known to be sensitive to penicillins, nor to rabbits, hamsters or guinea pigs. Severe disturbances of the intestinal bacterial flora may occur.

Treatment of horses is not advised due to the likelihood of severe local reactions at the injection site.

Treatment of dogs and cats intramuscularly is to be avoided as this may prove painful.

Local swelling at the injection site may occur in dogs, this usually regresses spontaneously in 2–4 days.

Withdrawal periods

Not to be used in animals producing milk for human consumption.

Animals must not be slaughtered for human consumption during treatment. Cattle, sheep and pigs may be slaughtered for human consumption only after 60 days from the last treatment.

Operator warning

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

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

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

3.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.

For animal treatment only. Keep out of reach and sight of children.

Pharmaceutical precautions

Do not store above 25°C. Do not freeze. Shake well before use.

This product does not contain an antimicrobial preservative.

Only dry, sterile needles and syringes should be used for administration and the septum should be swabbed before removing each dose.

After withdrawal of the first dose, use the product within 28 days.

Dispose of any unused product and empty containers in accordance with guidance from your local waste regulation authority.

Keep container in its outer carton.

Legal category


Packaging Quantities

Multidose vials of 80 ml.

Further information

Bioavailability studies indicate that a minimum duration of activity of 48 hours can be expected following a single injection.

Marketing authorisation number

Vm 01708/4233.

Need help or advice? Contact us:

  • Landline: 01582 842096
  • Mon - Fri: 8:30am - 5:00pm
  • Sat: 9:00am - 1:00pm
  • Email: [email protected]

All prices include VAT where applicable.

Delivery Information

How quickly do you deliver?

Under almost all products on our website is an Estimated dispatch time, check this for a delivery prediction specific to the item you are looking to purchase. These badges are updated live based on the stock levels we have and also those of our suppliers - so are usually very accurate, but cannot be guaranteed. In more general terms, we aim to dispatch all orders within 1 working day of receiving payment (and a prescription if required). If we cannot do so within 3 working days we will contact you by email.

What do you charge for delivery?

For UK delivery, we charge the following:

Order Total Weight Delivery
£0-£28.99 Under 2kg £2.99
2kg+ £4.99
£29-£38.99 Under 2kg Free
2kg+ £4.99
£39+ Under 2kg Free
2kg+ Free

Prices quoted are for delivery to all parts of mainland UK except certain Scottish postcodes (where the price is higher for items sent by courier. Delivery of food abroad (including Channel Islands, N. Ireland and other islands around the UK) is charged at a higher price and free delivery is not available. Temperature controlled products, such as Insulin, are also not always subject to the standard and/or free delivery options.

For full information on our delivery charges, including prices on heavy deliveries to Scotland and abroad, see our delivery information page.

We can deliver most items to all around the world, but prices do vary. The majority of light weight orders (less than 1.5kg) can be delivered for a flat rate of £10. For an accurate estimate of the delivery charge, please put the items you require in your basket and use the "Estimate Delivery" system on the shopping basket page (you only need to enter your country and postal/zip code) for a quick quote. For deliveries to the USA you may need to go to the checkout page and enter your full address to get a quote (as some services need your state in order to quote too). For more information on international deliveries, please see our delivery information page.

Delivery of aerosols

Due to air freight restrictions aerosols cannot ever be sent abroad by Royal Mail. We appreciate your understanding.

Delivery of temperature controlled items

Some products, such as insulin and frozen food, need to be delivered in insulated packaging to prevent them from getting too warm (or too cold) during transit from us to you. Purchasing any of these items in your order will result in a £1.99 charge being added to the total to cover the high cost of the insulated packaging materials. You only pay the £1.99 once per order, regardless of how many temperature controlled items you purchase in that order.

How do I cancel or return an order?

Please call us as soon as possible if you need to amend or cancel an order on 01582 842096. If your order has been processed for dispatch we will be unable to cancel or amend the order. You will however be able to return your product for a full refund*.

To return an item, you must contact us by phone or email to arrange this BEFORE posting any product back to us. We will explain the process at this stage for you.

*For full details on returns, see our terms and conditions page.


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