Can I take 90 and Magnesium glycinate together?
Drug interaction guide
Originally published 14 Mar 2026
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Magnesium can interfere with how your body absorbs certain medications, potentially making them less effective. It can also increase the risk of side effects like diarrhoea or stomach upset.
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Why this happens
Magnesium is a 'divalent cation'. This means it can bind to other drugs in the digestive tract (a process called chelation), preventing them from being absorbed into the bloodstream. Additionally, magnesium has a natural laxative effect which can be worsened by other medications.
What you should do
Back to contentsTo be safe, take your magnesium supplement at least 2 hours before or 4 hours after any other medications. If you are taking specific prescription drugs like antibiotics (e.g., doxycycline or ciprofloxacin), osteoporosis medicine (bisphosphonates), or thyroid hormones, you must speak to your pharmacist or doctor to ensure the timing is correct.
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Using other medicines
Back to contentsTaking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.
Disclaimer
This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.
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Article history
The information on this page is written and peer reviewed by qualified clinicians.
14 Mar 2026 | Originally published

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