Does Magniject 25% w/v Solution for Injection need a prescription?

Status not established. Neither the leaflet nor the law settles how this drug is dispensed, and we do not guess.

What is the withdrawal period of Magniject 25% w/v Solution for Injection according to the leaflet?

Cattle, meat: 0 days; Cattle, milk: 0 days; Sheep, meat: 0 days; Sheep, milk: 0 days.

Magniject 25% w/v Solution for Injection

Magnesium Sulphate Heptahydrate

Last verified 2026-10-04

Veterinary medicinal product: solution for injection. Distribution category: POM-VPS (Veterinary Medicines Regulations 2013, Schedule 3). Active substance: Magnesium Sulphate Heptahydrate.1

In short: questions and answers

Does Magniject 25% w/v Solution for Injection need a prescription?: Status not established. Neither the leaflet nor the law settles how this drug is dispensed, and we do not guess.
Which animals is Magniject 25% w/v Solution for Injection for?: Cattle, Sheep.1
What is the active substance in Magniject 25% w/v Solution for Injection?: Magnesium Sulphate Heptahydrate. ATCvet code: QA12CC.1 3
What is the withdrawal period of Magniject 25% w/v Solution for Injection according to the leaflet?: Cattle, meat: 0 days; Cattle, milk: 0 days; Sheep, meat: 0 days; Sheep, milk: 0 days.3

Dispensing

Status not established

POM-VPS: Prescription Only Medicine - Veterinarian, Pharmacist, Suitably Qualified Person. Prescription only, but the prescription may come from a veterinary surgeon, a pharmacist or a suitably qualified person (SQP, a registered animal-medicine adviser), and they may supply it.1 2

Animal species

Cattle1, Sheep1

Active substance

Magnesium Sulphate Heptahydrate

ATCvet code

QA12CC3

Manufacturer

Marketing authorisation holder: Norbrook Laboratories Limited

Withdrawal period

Animal species	Product	days
Cattle	meat	03
Cattle	milk	03
Sheep	meat	03
Sheep	milk	03

Summary of product characteristics

Composition

Active Substance:

Contains Magnesium Sulphate Heptahydrate 25.0% w/v

(equivalent to Magnesium Sulphate anhydrous 12.21% w/v)

Excipients:

For a full list of excipients, see section 6.1

6.1 List of excipients

Hydrochloric Acid, Concentrated

Water for Injections

Pharmaceutical form

Solution for Injection

A clear colourless/pale yellow solution for Injection

Pharmacological properties

Pharmacotherapeutic group: Mineral supplements, Other mineral supplements, Magnesium

ATC Vet Code: QA12CC

5.1 Pharmacodynamic properties

When administered by subcutaneous injection the product corrects the ionic disturbance associated with hypomagnesaemia. Magnesium is an essential mineral involved in metabolism, muscle activity and nerve functions.

Target species

Cattle and Sheep

Indications

Indicated in the treatment of hypomagnesaemia in cattle and sheep

Dosage

Administer by subcutaneous injection only, observing aseptic technique.

Cattle : Up to 400 ml

Sheep : Up to 75 ml

Warm to body temperature before administration, and gently massage the site of injection. For subcutaneous injection only, observing aseptic precautions. Divide the total dose volume to be administered between 2 or more sites.

Contraindications

Do not administer intravenously.

Adverse reactions

None

Warnings

i. Special precautions for use in animals

None

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

Wash hands after use.

Use during pregnancy, lactation or lay

Can be safely administered during pregnancy and lactation

Interactions

None known

Overdose

Not applicable.

Special warnings

None

Withdrawal period

	Cattle	Sheep
Meat :	Zero Days	Zero Days
Milk :	Zero Hours	Zero Hours

Incompatibilities

None known

Immediate packaging

Marketed in either 400 ml Amber Type III glass vials sealed using black rubber wads and aluminium screw caps, or 400ml white polypropylene bottles sealed with grey bromobutyl bungs and aluminium caps.

Storage

This product does not contain an antimicrobial preservative. Do not store above 25oC.

Any solution remaining in the vial following withdrawal of the required dose should be discarded.

Shelf life

Shelf life of the veterinary medicinal product as packaged for sale: 2 years.

Disposal of unused product

Any unused veterinary medicinal product or waste materials derived from such veterinary medicinal products should be disposed of in accordance with local requirements.

Additional information

Vm 02000/4129

9 DATE OF FIRST AUTHORISATION

19th October 1994

10 DATE OF REVISION OF THE TEXT

July 2010

Registration holder

Norbrook Laboratories Limited

Station Works

Camlough Road

Newry, Co. Down

BT35 6JP

Northern Ireland

Regulations

Veterinary Medicines Regulations 2013 (SI 2013/2033), Schedule 32

Sources

VMD Product Information Database: Magniject 25% w/v Solution for Injection, 02000/4129 UK Veterinary Medicines Directorate (OGL v3.0), checked 2026-10-04 archived copy from 2026-10-04
The Veterinary Medicines Regulations 2013, Schedule 3 (categories of veterinary medicinal products) UK Government, legislation.gov.uk, checked 2026-10-04 archived copy from 2026-10-04
Summary of Product Characteristics: Magniject 25% w/v Solution for Injection UK Veterinary Medicines Directorate, SPC of the marketing authorisation holder, checked 2026-10-04 archived copy from 2026-10-04