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Synonyms matching the FSN are not required. 

Concentration strength units

For solids and semi-solids, a concentration strength will be mass/mass (weight/weight) – usually mg/g.*

• Solid = pill, tablet, suppository, tape, patch, lozenge, implant, gum, capsule, etc.
• Semi-solid = cement, cream, gel, ointment, paste, poultice

For liquids, a concentration strength will be mass/volume (weight/volume) – usually mg/mL.*

• Liquid = solution, suspension, tincture, spirit, emulsion, foam, lotion, oil, lacquer, etc.

*Requests for new concepts that conflict with the above require a clear justification for the variance.

International Unit

International Unit as a description is arbitrary, and to be understood, each product requires reference to a particular bioefficacy specification for that entity.  Therefore, international unit is neither a meaningful nor comparable description at Clinical Drug level.  International unit will be represented as unit in Clinical Drug descriptions.  Abbreviations will not be used.

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