Rilematovir (JNJ-678) is an inhibitor of fusion protein with antiviral activity and low cytotoxicity. Rilematovir can be used in studies about respiratory syncytial virus treatment.

Amentoflavone (3',8''-Biapigenin), as a potent inhibitor of CYP3A4 and CYP2C9, can interact with many other medications. CYP3A4 and CYP2C9 are proteins used for drug metabolism in the body. Amentoflavone also is an inhibitor of human cathepsin B. It has antimalarial activity in trials significant affinities towards the Delta-1, kappa opioid receptors (as an antagonist) and binds to benzodiazepine receptors. Amentoflavone may be a potential lead for a new type of anti-inflammatory agents having the dual inhibitory activity of group II phospholipase A2 and cyclooxygenase. Amentoflavone and quercetin differentially exerted suppression of PGE2 biosynthesis via downregulation of COX-2/iNOS expression.

Presatovir (GS-5806) (GS-5806) is a novel, orally bioavailable RSV fusion inhibitor (mean EC50: 0.43 nM).

Enzaplatovir (BTA-585) is an orally available fusion inhibitor with antiviral activity for the study of respiratory syncytial virus infections and coronavirus disease (COVID-19) infections.

4-Methoxycinnamaldehyde (p-Methoxycinnamaldehyde) is an active ingredient of Agastache rugosa.4-Methoxycinnamaldehyde has cytoprotective activity against respiratory syncytial virus (RSV) in human laryngeal carcinoma cell lines, and helps to control disease induced by RSV infection, with an IC50 of approximately 0.055 μg/mL. The IC50 was about 0.055 μg/mL.