Magnesium oxide may contain inactive ingredients that can cause an allergic reaction, so people with allergies should speak to a doctor or pharmacist before taking, according to WebMD. People with kidney disease also should consult a health care professional before taking magnesium oxide tablets.
A person should never start, stop or change the prescribed dose of any medication unless a pharmacist or physician advises otherwise, notes WebMD. Because there could be harmful interactions between magnesium oxide and other products, the doctor or pharmacist should be aware of any other prescription or non-prescription medications or herbal products that a person is taking. Digoxin, cellulose sodium phosphate and sodium polystyrene sulfonate are especially important to clarify.
People who are taking demeclocycline, doxycycline, minocycline, tetracycline or any other medication associated with tetracycline should make sure to wait two to three hours between taking those medicines and taking magnesium oxide, as magnesium oxide may inhibit the absorption of those medicationss, states WebMD. People taking a bisphosphonate, a thyroid medication or a quinolone-type antibiotic should ask their physician about the appropriate times to take a magnesium oxide tablet.
Some magnesium oxide products may contain alcohol, aspartame or sugar, so people with affected conditions should avoid them unless otherwise directed by a doctor, notes WebMD. Nursing women should speak to a doctor before taking magnesium oxide tablets. Pregnant women should not take magnesium oxide tablets unless a doctor decides the benefits outnumber the risks.