Magnesium Oxide Side Effects

Possible side effects of magnesium oxide are listed below. Call your doctor if these side effects are severe or persistent after a few days.

• Diarrhea
• Stomach cramps

Some of the adverse effects of magnesium oxide can be more serious. Call your doctor right away or seek immediate medical attention if you experience any of the following symptoms:

• Skin rash, hives, itching, or other signs of allergic reactions
• Unusual tiredness or weakness
• Weak pulse
• Dizziness
• Extreme drowsiness
• Mental changes
• Slow reflexes
• Nausea
• Vomiting 

The above list may not include all the potential side effects of magnesium oxide. Tell your doctor if the side effects are unusual or severe or they do not get better over time. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Magnesium oxide Overdose: In case of an overdose of magnesium oxide, call your doctor immediately. You can also call the local poison control center or national poison control center at 1-800-222-1222. If a person has trouble breathing, cannot be awakened, or has had a seizure, call 911. Overdose symptoms may include flushing, nausea, dizziness, lack of energy, difficulty breathing, muscle weakness, and abnormal  heartbeat.

Source: FDA