Rumbul Rumen Bullet 40 g Continuous Release Intraruminal Device, Cattle
Active ingredient: Magnesium
Form
Continuous-release intraruminal device
Species
Manufacturer
Agrimin Ltd
VMD MA No.
04261/5000
What it's used for
Indicated in the treatment of hypocalcaemia in cattle where increased blood magnesium levels are required.
Full indications, dosage and side effects ↓The prescription itself has a price. See what practices near you charge for a consultation and the written prescription fee.
Paying less for Magnesium
-
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.
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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.
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Prescription required
Your vet must provide a written prescription on request. You can then purchase from any licensed online retailer.
Rumbul Rumen Bullet 40 g Continuous Release Intraruminal Device, Cattle — SPC Details
Source: VMD Summary of Product Characteristics (SPC). Last updated 27 Mar 2026.
magnesium levels are required.
Cattle:200 to 400 ml
administration.
Revised: July 2010
ATCVet code amended
i. Special precautions for use in animals
The solution should be warmed to body temperature before
administration. Intravenous injections should be given slowly in order to
avoid possible neuromuscular dysfunction and cardiac insufficiency.
Normal aseptic precautions should be observed.
Sites of subcutaneous administration should be massaged gently.
ii. Special precautions to be taken by the person administering the veterinary
medicinal product to animals
Care should be taken to avoid accidental self-injection: may cause
irritation at site of injection.
o
C. Protect from light.
The product does not contain an antimicrobial preservative. The product is
intended for single use only. Any product remaining in the bottle after withdrawal
of the required dose should be discarded.
Meat – Zero days
Milk – Zero hours
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.
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Other Products Containing Magnesium
These products share the same active ingredient and may be suitable alternatives. Always consult your vet.
Calciject 40 CM Solution for Injection
POM-VPSNorbrook Laboratories Limited
Downlands Calcium Borogluconate 40% w/v CM Solution for Injection
POM-VPSNorbrook Laboratories Limited
Megacal-M Solution for Injection
POM-VPSBallinskelligs Veterinary Products
Rumbul Rumen Bullet 15 g Continuous Release Intraruminal Device, Sheep/Calves
POM-VPSAgrimin Ltd
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