You should not take magnesium salicylate tetrahydrate if you are sensitive or allergic to any of its ingredients or are allergic to aspirin. You should not use this drug if you have liver disease, a heart disease called carditis, or have or have ever had severe stomach inflammation or stomach ulcers. You also should not use this drug if you have taken salicylates (like aspirin) for long periods of time. This may not be an appropriate drug for you if you take anti-gout drugs like probenecid (Benemid) or if you have advanced or chronic kidney disease. This drug may not be advisable for anyone with a vitamin K deficiency, blood clotting or bleeding problems, anyone scheduled to have surgery or certain medical tests, or those who take anti-blood-clotting medicines.
Pregnant women should not take this drug. This drug is similar to aspirin, which may raise the risk of a stillbirth or death soon after birth. This drug could also cause pregnancy to extend or it could lengthen the labor process. Using this drug in the last trimester can cause fatal lung damage to a fetus. Breastfeeding women should only use this with caution or only with the consent of your doctor, as it can be passed to a nursing baby through breast milk.