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Merck Index
The Merck Index provides a searchable reference for chemical substances by name or CAS Registry Number.
About Merck Index
The Merck Index Online is a searchable reference for chemicals, drugs and biologicals. It can be searched by substance name or CAS Registry Number and provides physical, pharmacological and historical information through over 12,000 monographs.
It has been updated by the Royal Society of Chemistry since 2013 and is expanded with curated literature and patent references. Contact information is provided for arranging access, and the Merck Index name is licensed to the Royal Society of Chemistry for use in the USA and Canada.
Key features
- Search substances by name
- Search substances by CAS Registry Number
- View monographs on chemicals, drugs and biologicals
- Read physical, pharmacological and historical substance data
- Consult curated literature references
- Consult curated patent references
Best for: People who need to look up physical, pharmacological or historical information on chemicals, drugs and biologicals.
Good for
- Contains over 12,000 monographs
- Searchable by name or CAS Registry Number
- Includes literature and patent references
Merck Index at a glance
- Website
- merckindex.rsc.org
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Merck Index FAQ
Who updates The Merck Index Online?
The Royal Society of Chemistry has updated it since 2013.
How do I arrange access?
Sales enquiries can be sent to [email protected].
Who do I contact with editorial questions?
Editorial contact is [email protected].
Is something wrong or out of date?
Tell us and an editor will check it.
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