That statement is too absolute and misleading.
Magnesium is not universally forbidden with any medication. What does happen is that magnesium can reduce absorption of certain drugs in the gut, so timing matters.
Common medications that interact with magnesium (mainly absorption issues):
- Tetracycline antibiotics (e.g., doxycycline, tetracycline)
- Fluoroquinolone antibiotics (e.g., ciprofloxacin, levofloxacin)
- Levothyroxine (thyroid hormone replacement)
- Bisphosphonates (e.g., alendronate for osteoporosis)
- Iron supplements (can compete for absorption)
Key point
It’s usually not “never use magnesium,” but:
Separate dosing by 2–6 hours (depending on the medication) to avoid interference.
Important nuance
- Magnesium is often still safe and even beneficial for many people on these medications.
- The issue is absorption timing, not dangerous interactions in most cases.
If you want, tell me the specific medications you had in mind and I can check the exact interaction and spacing rules.
