Pharmacological Conditioning

Prior experimental itch evidence suggests conditioning-based placebo effects may be more robust and durable than verbal suggestion alone. An earlier proof-of-concept psoriasis study found partial reinforcement produced better symptom improvement and less relapse than continuous reinforcement at the same cumulative drug exposure. The intervention pairs secukinumab with a distinctive gustatory cue to try to preserve clinical benefit at lower cumulative secukinumab doses. Pharmacological conditioning relies on implicit learning rather than only conscious expectation. Pairing an active drug with a neutral stimulus can allow the stimulus to later evoke a physiological response similar to the drug response. The trial tests pharmacological conditioning as a way to reduce biological drug exposure while maintaining benefit in moderate-to-severe chronic plaque psoriasis.