Neopen suspension for injection

An antibiotic injection containing neomycin and penicillin for use in cattle, horses and pigs. This product may only be prescribed by your local veterinary practitioner from whom advice must be sought.

Product Information for Veterinary Healthcare Professionals

Neopen contains an off-white suspension of procaine penicillin in a solution of neomycin sulphate, presented in 100 ml vials. Each ml contains: Neomycin base (as the Sulphate PhEur) 100 mg, Procaine penicillin 200 mg (200,000 i.u.). For uses, dosage. contra-indications and warnings, see datasheet. This product is licensed for use in cattle, horses and pigs. 

Responsible use of Antibiotics

When used correctly, antibiotics have an important role by maintaining health and welfare of animals. However, there are concerns that resistance or resistant bacteria could be transferred from animal to human health, and vice versa, and reduce the effectiveness of some antibiotic treatments. It is vital that antibiotics are used in the correct and appropriate manner to minimise this possibility.

MSD Animal Health supports the responsible use of antibiotics.

For more information please refer to Ireland’s National Action Plan for Antimicrobial Resistance on

For uses, dosage, contra-indications and warnings please consult product leaflet. Further information is available on request. Use medicines responsibly.

Legal Category 

Packaging Quantities 
Glass bottles or polyethylene terephthalate (PET) bottles containing 100 ml.

Neopen Summary of Product Characteristics

For Summary of Product Characteristics, first click on this link. Then scroll down to Documents section. Subsequently click on PDF version on line opposite Summary of Product Characteristics.