Answer
Doxazosin mesilate is the salt used in the tablet. Product information commonly states the amount equivalent to doxazosin, the active medicine.
Sources for this answer
- Doxazosin 8mg tabletsemc · SmPC Current selected SmPC · Version 1
- Doxadura XL 4mg Prolonged Release Tabletsemc · SmPC Current selected SmPC · Version 6