Drug interactions
Nitrofurantoin + Trimagnesium
Severity: Moderate
Nitrofurantoin and Trimagnesium: moderate 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, such as magnesium trisilicate antacids, can reduce nitrofurantoin absorption. Lower exposure may reduce urinary drug concentrations and efficacy in urinary tract infection.
What this interaction means in plain words
Nitrofurantoin and Trimagnesium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Adsorption or binding of nitrofurantoin by magnesium salts in the gut reduces its absorption.
What to do
Give nitrofurantoin at least 2 hours before magnesium products, and avoid them during therapy where possible. Monitor clinical response.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Nitrofurantoin and Trimagnesium, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Nitrofurantoin
Frequently asked questions
Can I take Nitrofurantoin with Trimagnesium?
MediHelp rates the interaction as moderate. Nitrofurantoin and Trimagnesium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Magnesium-containing products, such as magnesium trisilicate antacids, can reduce nitrofurantoin absorption. Lower exposure may reduce urinary drug concentrations and efficacy in urinary tract infection.
How serious is the interaction between Nitrofurantoin and Trimagnesium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Give nitrofurantoin at least 2 hours before magnesium products, and avoid them during therapy where possible. Monitor clinical response.
What other medicines interact with Nitrofurantoin?
MediHelp also lists interactions of Nitrofurantoin with, for example, Pexidartinib, Pretomanid, Aluminum hydroxide. The full list is on the Nitrofurantoin page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
