Can I take 100 and Allergan together?
Drug interaction guide
Originally published 12 May 2026
Meets Patient’s editorial guidelines
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There is no known interaction between 100 (assuming this refers to Eltroxin 100mcg/Levothyroxine) and Allergan (assuming this refers to Allergan's common eye drops like Optive or Refresh). However, if '100' refers to a different medication or 'Allergan' refers to a specific prescription drug not mentioned, the risk could change.
In this article:
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Why this happens
Levothyroxine is a thyroid hormone replacement taken orally, while Allergan lubricant eye drops work locally on the surface of the eye. They do not interfere with each other's absorption or effects.
What you should do
Back to contentsYou can safely use these products together. If you meant a specific prescription medication from Allergan (such as Lumigan or Alphagan), please specify the name, as some prescription eye drops can occasionally affect heart rate or blood pressure, which may need monitoring if you have thyroid issues.
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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.
12 May 2026 | Originally published
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