Drug interactions
Magnesium citrate + Nitrofurantoin
Severity: Minor
Magnesium citrate and Nitrofurantoin: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Magnesium-containing products, particularly magnesium trisilicate antacids, can reduce oral nitrofurantoin absorption. Magnesium citrate has less supporting data, and the clinical impact is probably small, though reduced urinary levels could in theory lower efficacy.
What this interaction means in plain words
Magnesium citrate and Nitrofurantoin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Magnesium citrate belongs to Gastrointestinal Tract; Nitrofurantoin belongs to Anti Bacterial.
Why it happens
Magnesium may adsorb nitrofurantoin in the gut and reduce its absorption.
What to do
Separate nitrofurantoin from magnesium citrate by about 2 hours where practical. Avoid giving the laxative during treatment of urinary infection if possible.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Magnesium citrate
- Ciprofloxacin + Magnesium citrate Major
- Baloxavir marboxil + Magnesium citrate Moderate
- Bictegravir + Magnesium citrate Moderate
- Cabotegravir + Magnesium citrate Moderate
- Cholecalciferol + Magnesium citrate Moderate
- Deferiprone + Magnesium citrate Moderate
Other interactions of Nitrofurantoin
Frequently asked questions
Can I take Magnesium citrate with Nitrofurantoin?
MediHelp rates the interaction as minor. Magnesium citrate and Nitrofurantoin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Magnesium-containing products, particularly magnesium trisilicate antacids, can reduce oral nitrofurantoin absorption. Magnesium citrate has less supporting data, and the clinical impact is probably small, though reduced urinary levels could in theory lower efficacy.
How serious is the interaction between Magnesium citrate and Nitrofurantoin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate nitrofurantoin from magnesium citrate by about 2 hours where practical. Avoid giving the laxative during treatment of urinary infection if possible.
What other medicines interact with Magnesium citrate?
MediHelp also lists interactions of Magnesium citrate with, for example, Ciprofloxacin, Baloxavir marboxil, Bictegravir. The full list is on the Magnesium citrate page.
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