warnings

What is the most important information I should know about Magnesium Salicylate (MST)?

Magnesium salicylate can increase your risk of fatal heart attack or stroke, even if you don't have any risk factors. Do not use this medicine just before or after heart bypass surgery (coronary artery bypass graft, or CABG).

Magnesium salicylate may also cause stomach or intestinal bleeding, which can be fatal. These conditions can occur without warning while you are using magnesium salicylate, especially in older adults.

You should not use this medicine if you are allergic to aspirin or other salicylates.

Ask a doctor before giving the medicine to a child younger than 12 years old. Do not give this medicine to a child or teenager with a fever, flu symptoms, or chickenpox. Salicylates can cause Reye's syndrome, a serious and sometimes fatal condition in children.

Ask a doctor or pharmacist if this medicine is safe to use if you have ever had:

bleeding problems;
heartburn, stomach ulcer, or stomach bleeding;
asthma;
heart disease, high blood pressure;
liver disease, cirrhosis, or if you drink more than 3 alcoholic beverages per day;
kidney disease;
arthritis, gout; or
diabetes.

Ask a doctor before using this medicine if you are pregnant or breastfeeding.

If you are pregnant, you should not take this medicine unless your doctor tells you to. Taking an NSAID during the last 20 weeks of pregnancy can cause serious heart or kidney problems in the unborn baby and possible complications with your pregnancy.

Side Effects

What are the side effects of Magnesium Salicylate (MST)?

Get emergency medical help if you have signs of an allergic reaction: sneezing, runny or stuffy nose; wheezing or trouble breathing; hives; swelling of your face, lips, tongue, or throat.

Stop using this medicine and call your doctor at once if you have:

new symptoms such as redness or swelling;
ringing in your ears, hearing loss;
a light-headed feeling, like you might pass out;
new or worsening stomach pain; or
bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds.

Less serious side effects may be more likely, and you may have none at all.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Dosage Guidelines & Tips

How to take Magnesium Salicylate (MST)?

Use Magnesium Salicylate (MST) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Use exactly as directed on the label, or as prescribed by your doctor.

Take this medicine with a full glass of water.

Take with food if this medicine upsets your stomach.

Call your doctor if your symptoms get worse or you still have pain after 10 days. Tell your doctor if you have a fever that lasts longer than 3 days, or if you have any redness or swelling.

If you need surgery or dental work, tell the surgeon or dentist ahead of time that you are using magnesium salicylate. You may need to stop using the medicine for a short time.

Store at room temperature away from moisture and heat.

What should I do if I missed a dose of Magnesium Salicylate (MST)?

Since magnesium salicylate is used when needed, you may not be on a dosing schedule. Skip any missed dose if it's almost time for your next dose. Do not use two doses at one time.