If you mean “Never use magnesium if you are taking any of the following medications…”, the main issue is that magnesium can reduce absorption of some medicines.
Common important interactions include:
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Certain antibiotics — especially tetracyclines (e.g., doxycycline) and fluoroquinolones (e.g., ciprofloxacin).
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Levothyroxine — magnesium can reduce its absorption.
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Bisphosphonates — such as alendronate.
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Some HIV medications and other drugs whose absorption is affected by minerals.
Usually, magnesium doesn’t have to be completely avoided; separating the doses by several hours may be sufficient, depending on the medication.
If you give me the full list of medicines/supplements you’re taking, I can check the specific interactions.
