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We offer competitive pricing on all our medications. Find a lower price? We'll match it from any verified Canadian online pharmacy! Know More
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Select the prescribed dosage and quantity, then proceed to checkout.
Sign in or create a new account.
Upload your prescription.
Complete your purchase by processing the payment.
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Magnesium Oxide contains magnesium, a vital mineral used to prevent or correct magnesium deficiency and support various body functions, such as muscle and nerve activity, heart rhythm, and bone strength. It is available in oral tablet form in strengths of 200 mg, 400 mg, 420 mg, 500 mg, and 875 mg. Take it orally with water, usually one or two times a day, as directed by a healthcare provider. Suitable for adults and older children, it works by replenishing low magnesium levels. Common side effects include diarrhea or stomach discomfort. Use with caution in kidney conditions. Store in a cool, dry place and do not double the dose if missed.
| Generic Name | Magnesium Oxide | ||||
| Brand Name | - | ||||
| Forms | Oral Tablets | ||||
| Strengths Available | 200 mg | 400 mg | 420 mg | 500 mg | 875 mg |
| Packaging | A package of 90 tablets | ||||
| Requires Prescription | Not Required | ||||
| Ships to USA | Yes |
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Magnesium Oxide is primarily used to correct or prevent magnesium deficiency and to treat various conditions associated with low magnesium levels. It may also be used as an antacid or mild laxative. It is commonly used in patients with:
It is typically prescribed when a person has low blood magnesium levels due to poor dietary intake, gastrointestinal disorders, certain medications, or chronic health conditions that deplete magnesium.
Recommended Dosage for different age groups and different conditions.
Initial Dose: 200–500 mg orally once or two times a day, depending on the medical condition and the patient's magnesium levels.
Adjustment: Dosage may be adjusted based on serum magnesium levels, response to treatment, and presence of side effects. In cases of severe deficiency, higher doses might be prescribed under medical supervision.
Maximum Dose: 875 mg two times a day, typically safe under medical supervision.
Magnesium Oxide provides the body with magnesium, an essential mineral that plays a crucial role in muscle and nerve function, maintaining a healthy heart rhythm, supporting bone health, and aiding energy metabolism. Once ingested, it dissolves in the stomach and is absorbed through the intestines. At higher doses, it draws water into the intestines, which helps relieve constipation. Additionally, its alkaline properties help neutralize excess stomach acid, providing relief from heartburn and indigestion.
Common side effects of Magnesium Oxide:
Serious side effects of Magnesium Oxide:
Note: Contact your healthcare provider or doctor if you experience any serious symptoms or unusual symptoms
If you buy Magnesium Oxide online, you should be aware of the following warnings associated with it:
You can order Magnesium Oxide online from Canada and follow these precautionary measures:
Electrolyte Imbalance: Prolonged use may disrupt electrolyte levels, especially when used as a laxative.
If you miss the Magnesium Oxide dosage, take it as soon as you remember. If it is almost time for the next dose, skip the missed one—do not double the dose.
An overdose of Magnesium Oxide can cause severe diarrhea, stomach cramps, and nausea. Seek immediate medical help if an overdose is suspected.
Many patients choose to order Magnesium Oxide from Canada and follow these storage instructions:
Magnesium oxide can interact with certain medications, which might affect how they work or increase the risk of side effects. It’s important to inform your healthcare provider or doctor about all the medications and supplements you are taking before starting magnesium oxide. Some common drugs that may interact with magnesium oxide include:
If magnesium oxide is not suitable or effective for your condition, your healthcare provider may recommend other options to manage your symptoms or supplement your magnesium levels. Common alternatives include:
At Polar Bear Meds, we’re committed to making your medications, like Magnesium Oxide, more accessible and affordable for USA patients. Our prices are significantly lower than typical USA pharmacy retail rates without compromising on safety or quality. Every order is sourced exclusively from licensed and trusted pharmacies and undergoes complete prescription verification to ensure compliance and authenticity. We offer discreet, trackable shipping to all USA states, along with refill support for ongoing treatment. Our friendly customer service team is here to help you.
Get Magnesium Oxide delivered straight from Canada to your doorstep in the USA. You can also save more by using the coupon code “WELCOMEPB10” for 10% off on your first order. There are no hidden handling or processing fees, as we believe in complete transparency. Looking to save even more? Join our referral program to earn a $20 credit every time you refer a friend or a family member. Your referral will receive a $20 credit, so everyone wins. Additionally, after every 10 verified customers' referral, you'll receive a $100 credit in your account as a thank-you for spreading the word.
AtPolar Bear Meds, your safety is our priority. Every order is dispensed from a fully licensed Canadian pharmacy following strict standards for quality, security, and patient care. To conveniently buy Magnesium Oxide from Canada at a substantial cost, call us at1-888-779-2193toll-free.

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
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