Interaction between Infliximab and Denosumab
Moderate Synergy

ID DDInter923 and DDInter500
Interaction Concomitant use of immunosuppressive or myelosuppressive agents with denosumab may increase the risk of serious infections. Denosumab binds to and inhibits the receptor activator of nuclear factor kappa-B ligand (RANKL), which is expressed on activated T and B lymphocytes and in lymph nodes. Thus, denosumab alone may increase the risk of infections.
Management Caution is advised if denosumab must be used in combination with immuno- or myelosuppressive agents. Patients should be advised to contact their physician if they develop signs and symptoms of infection such as fever, chills, diarrhea, sore throat, muscle aches, shortness of breath, blood in phlegm, weight loss, red or inflamed skin, body sores, and pain or burning during urination. The need for continued denosumab therapy should be assessed when serious infections occur during treatment.
References
Alternative for Infliximab L04A
Alternative for Denosumab M05B

Potential Metabolism Interactions

Substrate-Substrate Interaction:If more than one drug is metabolized by the same CYP, it is possible that its metabolism is inhibited because of the competition between the drugs. That means, it can be useful to lower the dosage of the drugs in the drug-cocktail because they remain longer in the organism than in monotherapy.
Inhibitor-Inhibitor Interaction:Combining two or more inhibitors of one CYP, should be compensated by lowering the dosage of these drugs because the metabolism is reduced and the drugs remain longer in the organism than in monotherapy. Not adapting the dosage bears the risk of even more side effects.
Inhibitor-Substrate Interaction:Combining drugs that have inhibitory effect and are substrates of one particular CYP, should be compensated by lowering the dosage. They rest longer in the organism than in monotherapy. Not adapting the dosage bears the risk of even more side effects.