POM-V Prescription Required

Geepenil vet 300 mg/ml Powder for Solution for Injection

Active ingredient: Benzylpenicillin Sodium

Form

Injection

Species

Horses

Manufacturer

Orion Corporation

VMD MA No.

06043/4008

What it's used for

Infections caused by micro-organisms sensitive to benzylpenicillin in horse.

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 Benzylpenicillin Sodium

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

Geepenil vet 300 mg/ml Powder for Solution for Injection — SPC Details

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

Infections caused by micro-organisms sensitive to benzylpenicillin in horse.

To prepare a ready-to-use solution, mix 17 ml of water for injection with 6.36 g
benzylpenicillin sodium. This provides 21 ml of solution for injection with the
concentration of 300 mg/ml. Sterile water is not included in the package, but
any water for injection normally used in veterinary practice can be utilised as a
solvent. Inject the solvent into the vial using a sterile needle of appropriate size.
Shake the vial to mix the powder with water. Once the solution turns clear, it is
ready for use.
10-20 mg/kg body weight intravenously (slowly), equivalent of
3.3 – 6.7 ml/100 kg body weight, 2 times a day. The treatment should last a
minimum of 4 days.
To ensure the correct dosage, bodyweight should be determined as accurately
as possible to avoid underdosing.

Do not use in known cases of hypersensitivity to the active substance or to any
of the excipients.
Do not use this product in the treatment of diseases caused by beta-lactamase
producing staphylococci.

Issued: January 2022
AN: 01447/2020

Allergic hypersensitivity reactions and gastrointestinal disorders can occur.

Penicillins 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.

i) Special precautions for use in animals
This medicinal product must not be administered intramuscularly to horses
because it causes local irritation.
Use of the product should be based on susceptibility testing of bacteria isolated
from the animal. If this is not possible, therapy should be based on local
(regional, farm level) epidemiological information about susceptibility of the
target bacteria.
Due to the likely variability in susceptibility of bacteria to benzylpenicillin
sodium, bacteriological sampling and susceptibility testing are recommended.
Official, national and regional antimicrobial policies should be taken into
account when the product is used.
Use of the product deviating from the instructions given in the SPC may
increase the prevalence of bacteria resistant to benzylpenicillin and may
decrease the effectiveness of treatment with other penicillins and
cephalosporins due to the potential for cross-resistance.
The usual aseptic precautions should be followed when administered the
product.
Not for intrathecal administration.
ii) Special precautions for the person administering the veterinary medicinal
product to animals
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.
Avoid skin contact with 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.
If you develop symptoms following exposure, such as a skin rash, you should
seek medical advice and show the package leaflet or the label to the physician.
Swelling of the face, lips or eyes or difficulty in breathing are more serious
symptoms and require urgent medical attention.
This product may cause eye irritation.

Issued: January 2022
AN: 01447/2020
Avoid contact with the eyes.
In the event of accidental eye contact, rinse the affected eye(s) with plenty of
clean water.
Wash hands after use.
iii) Other precautions
None.

Bactericidal effect of penicillin is prevented if bacteriostatic agents, like
erythromycin or tetracyclines, are used concomitantly.

Powder:
This veterinary medicinal product does not require any special storage
conditions.
Reconstituted product:
Store the reconstituted product in a refrigerator (2 – 8°C).

Not authorised for use in horses intended for human consumption.

Issued: January 2022
AN: 01447/2020
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.