If you’re asking about magnesium supplements and medication interactions, the warning should be more nuanced: magnesium isn’t automatically unsafe with these medicines, but it can reduce absorption or alter the effects of certain drugs.
Medicines that may interact with magnesium
- Certain antibiotics — including tetracyclines and fluoroquinolones. Magnesium can bind to them and reduce absorption.
- Levothyroxine — magnesium may reduce absorption if taken too close together.
- Bisphosphonates — medicines such as alendronate can have reduced absorption when taken with magnesium.
- Some osteoporosis medications — mineral supplements may interfere with absorption of certain oral treatments.
- Diuretics — some can increase magnesium loss, while others can increase magnesium levels.
- Medications that affect kidney function — people with impaired kidney function may accumulate magnesium, potentially causing dangerously high levels.
Don’t simply stop your medication
The important issue is often timing, not complete avoidance. Some medicines need to be separated from magnesium by several hours. The exact interval depends on the medication.
Also, people with kidney disease should be particularly careful with magnesium supplements because the kidneys normally remove excess magnesium.
If you tell me the name and dose of the medication(s) you’re taking, I can explain whether magnesium is compatible with them and how they should be spaced.
