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How big is a medicine bottle cap?

Published in Medicine Bottle Sizes 2 mins read

A standard medicine bottle cap is 28mm in size.

Here's a breakdown of what that means:

  • Industry Standard: According to industry standards, medicine bottle caps are typically manufactured to fit a specific bottle neck size. The most common size is 28mm. This ensures compatibility and prevents leakage when the cap is screwed onto the bottle.
  • Compatibility: A 28mm cap is designed to fit bottles with a 28mm neck opening. This standardization helps streamline the packaging process and makes it easier for consumers to use various medications.
  • Non-Sterile: It is important to note that bottle caps, as stated in the reference, are non-sterile. Therefore, they should be handled with care and not be directly touched on the inside where they might come into contact with the medication.


Here's a summary table:

Feature Details
Standard Size 28mm
Compatibility Fits 28mm neck bottles
Sterility Non-sterile


Therefore, if you're dealing with standard medicine bottles, the cap you're likely to encounter will be 28mm in diameter. This standardized sizing helps in consistent sealing and packaging across the pharmaceutical industry.

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