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Calcium Sulfate

Medically reviewed by Last updated on Jun 9, 2023.

Excipient (pharmacologically inactive substance)

What is it?

Calcium sulfate (CaO4S) is a calcium salt that is used for a variety of purposes including: building materials, as a desiccant (drying agent), in dentistry as an impression material, cast, or die, and in medicine for immobilizing casts and as an inactive ingredient tablet excipient and color glaze. It exists in various forms and states of hydration. It exists as a fine, white to slightly yellow-white odorless powder. It is also used as an anti-caking agent and colorant.

List of medications using Calcium Sulfate


  1. Code of Federal Regulations, Title 21, Volume 3, Revised as of April 1, 2013. CITE: 21CFR184.1230 Accessed 1/14/2014.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.