Rifampicin and ritonavir are:
Ans. C. Pharmacokinetic antagonista. Rifampicin is an enzyme inducer of CY3A4 and ritonavir is metabolized by CYP3A4.b. Thus rifampicin can antagonize ritonavir by inducing its metabolism; known as pharmacokinetic antagonism.
Physical antagonist
Chemical antagonist
Pharmacokinetic antagonist
Competitive antagonist
General Pharmacology