What is Magnesium Sulfate? Uses, warnings & side effects

What is Magnesium Sulfate? Uses, warnings & side effects

Updated May 14, 2025 • Published Dec 30, 2020

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Magnesium Sulfate overview

BRAND NAMES:

magnesium sulfate Novaplus, PremierPro Rx Magnesium Sulfate

Generic Names:

Magnesium Sulfate

Uses:

Prevents seizures in pregnant women with severe eclampsia. Also supplies your body with magnesium, when needed, and treats muscle spasms caused by severe low levels of magnesium in the blood. Treats barium poisoning, brain swelling, and uncontrolled rapid heartbeat.

Therapeutic Classes:

Anticonvulsant, Laxative, Hyperosmotic, Parenteral Mineral-Trace Mineral, Renal-Urologic Agent

Forms:

Injectable

How it’s taken:

By injection

What is Magnesium Sulfate used for?

What form(s) does Magnesium Sulfate come in?

Injectable

What are common Magnesium Sulfate dosages?

Vial 2ML of 50%
Vial 10ML of 50%
Vial 20ML of 50%
Vial 50ML of 50%
Syringe 10ML of 50%
Flex Cont 50ML of 2GM/50ML
Flex Cont 50ML of 4GM/50ML
Flex Cont 100ML of 4GM/100ML
Bottle 100 Capsules
Bottle 1GM of

Magnesium Sulfate images - What does Magnesium Sulfate look like?

Magnesium Sulfate
1000ml of 40gm/1000ml flex cont
Magnesium Sulfate
100ml of 4gm/100ml flex cont
Magnesium Sulfate
500ml of 20gm/500ml flex cont
Magnesium Sulfate
50ml of 2gm/50ml flex cont
Magnesium Sulfate
50ml of 4gm/50ml flex cont
Magnesium Sulfate
10ml of 50% syringe
Magnesium Sulfate
10ml of 50% vial
Magnesium Sulfate
20ml of 50% vial
Magnesium Sulfate
2ml of 50% vial

How to take Magnesium Sulfate

Your doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given through a needle placed in a vein or a muscle.
This medicine may need to be injected slowly, sometimes over several hours.
A nurse or other trained health professional will give you this medicine.
A nurse or other trained health professional will give you this medicine.
This medicine may need to be injected slowly, sometimes over several hours.
Your doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given through a needle placed in a vein or a muscle.

What to do if you miss a dose of Magnesium Sulfate

Magnesium Sulfate contraindications - Who shouldn't take Magnesium Sulfate?

You should not receive this medicine if you have had an allergic reaction to magnesium sulfate, or if you have heart damage or heart block (a problem with heart rhythm).

Magnesium Sulfate warnings

Talk to your doctor before you receive this medicine if you are breastfeeding.
Make sure your doctor knows if you have kidney disease.
Lightheadedness or fainting
Trouble breathing
Weakness, or loss of feeling or muscle control

Magnesium Sulfate interactions & what to avoid when taking Magnesium Sulfate

Make sure your doctor knows if you are also using an antibiotic such as clindamycin, polymyxin B, streptomycin, tetracycline, or tobramycin, or a cardiac glycoside such as digoxin.
Tell your doctor if you are using any medicine that makes you sleepy. This includes sleeping pills, cold and allergy medicine, narcotic pain relievers, and sedatives.

Magnesium Sulfate side effects - How does Magnesium Sulfate make you feel?

Serious Side Effects

Flushing or sweating
Weakness, or loss of feeling or muscle control
Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Trouble breathing
Lightheadedness or fainting