CINACALCET AND RIFAMPICIN (RIFAMPIN)

Rifampicin is predicted to decrease cinacalcet levels by inducing its metabolism by CYP3A4. This seems a reasonable prediction as potent CYP3A4 inhibitors raise cinacalcet levels.
It may be prudent to monitor parathyroid hormone and serum calcium more frequently if rifampicin is started or stopped.