Answer
Fentanyl citrate is the salt used in these products; fentanyl is the active opioid responsible for the clinical effects.
Sources for this answer
- Fentanyl 50 micrograms/ml solution for injection — Current selected SmPCemc · Summary of Product Characteristics
- Abstral Sublingual Tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.