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Neopen 100 ml

MSD Intervet
Registration number:
REG NL 1556

Is the registration number of your country not listed? Then this product falls within the cascade control system.

Contains per ml 200.000 IE procaïnepenicilline en 100mg neomycine (as sulphate)
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Neomycin 100mg/ml, procaine benzylpenicillin 200mg/ml


For the treatment of infectious diseases in horses, sheep, pigs, dogs and cats caused by bacteria sensitive to the combination. The combination shows a broad spectrum of activity.


Do not use in animals known to be allergic to penicillin or neomycin.
Do not administer by the intravenous route.


Overdosage with neomycin parenterally can cause renal damage and deafness but this is unlikely at normal therapeutic dosage levels.
Occasionally in sucking and fattening pigs, administration of this product may cause a transient pyrexia, vomiting, shivering, listlessness and incoordination.
Additionally in pregnant sows and gilts, a vulval discharge which could be associated with abortion has been reported.
Allergic reactions have been observed occasionally.
Local reaction (swelling) may occur at the injection site in horses for up to a week after administration.
Occasional, potentially fatal reactions associated with the administration of procaine penicillin in horses have been observed.

Dosage and administration

The recommended dosage level is:

For horses: 5 ml/ 100kg of body weight
For sheep: 1 ml/ 20 kg of body weight
For pigs: 1 ml/ 20 kg of body weight
For dogs: 1 ml/ 10 kg of body weight
For cats: 0.5 ml/ 5 kg of bodyweight

The dose should be repeated at 24 hours intervals as required to a maximum of three doses.
Administration should be by intramuscular or subcutaneous injection in al species.

Precautions of storage
Store at between +2°C to +8°C

per ml: Neomycin 100mg/ml, procaine benzylpenicillin 200mg/ml
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