MODERATE — Monitor Closely
🟡 USE CAUTION — Magnesium and Levothyroxine may interact. Talk to your doctor before combining.
Evidence level: STRONG
Magnesium can interfere with thyroid medication absorption. Take at least 4 hours apart.
Magnesium may bind levothyroxine in GI tract, reducing absorption.
The interaction between Magnesium and Levothyroxine is manageable with awareness. Talk to your doctor or pharmacist, especially if you notice any new or unusual symptoms after combining them.
Take levothyroxine on an empty stomach, 30-60 minutes before breakfast. Take supplements at least 4 hours later to be safe.
Risk may increase with: older age, liver or kidney impairment, taking multiple medications, and higher doses of either substance.
Monitor for any new or unusual symptoms when starting this combination. Report changes to your healthcare provider.
Mention this combination at your next appointment. Ask: "Should I adjust timing or doses of Magnesium and Levothyroxine?" Your doctor may want to monitor specific lab values.
Thyroid medications are sensitive to absorption interference. Take levothyroxine on an empty stomach, 30-60 minutes before food or other supplements. Space calcium, iron, and antacids at least 4 hours away. Selenium and zinc are generally safe thyroid-supporting nutrients.
Magnesium can interfere with thyroid medication absorption. Take at least 4 hours apart.
Take levothyroxine on an empty stomach, 30-60 minutes before breakfast. Take supplements at least 4 hours later to be safe.
Monitor for any new or unusual symptoms when starting this combination. Report changes to your healthcare provider.
Thyroid medications are sensitive to absorption interference. Take levothyroxine on an empty stomach, 30-60 minutes before food or other supplements. Space calcium, iron, and antacids at least 4 hours away. Selenium and zinc are generally safe thyroid-supporting nutrients.
Mention this combination at your next appointment. Ask: "Should I adjust timing or doses of Magnesium and Levothyroxine?" Your doctor may want to monitor specific lab values.
Or browse the full interaction database (121,000+ pairs).