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Aims  Co‐crystal of tramadol–celecoxib (CTC) is a novel co‐crystal molecule containing two active pharmaceutical ingredients under development by Esteve (E‐58425) and Mundipharma Research (MR308). This Phase I study compared single‐dose pharmacokinetics (PK) of CTC with those of the individual reference products [immediate‐release (IR) tramadol and celecoxib] alone and in open combination.    Methods  Healthy adults aged 18–55 years were orally administered four treatments under fasted conditions (separated by 7‐day wash‐out period): 200 mg IR CTC (equivalent to 88 mg tramadol and 112 mg celecoxib; Treatment 1); 100 mg IR tramadol (Treatment 2); 100 mg celecoxib (Treatment 3); and 100 mg IR tramadol and 100 mg celecoxib (Treatment 4). Treatment sequence was assigned using computer‐generated randomization. PK parameters were calculated using noncompartmental analysis with parameters for CTC adjusted according to reference product dose (100 mg).    Results  Thirty‐six subjects (28 male, mean age 36 years) participated. Tramadol PK parameters for Treatments‐1, –2 and –4, respectively, were 263, 346 and 349 ng ml –1  (mean maximum plasma concentration); 3039, 2979 and 3119 ng h ml –1  (mean cumulative area under the plasma concentration–time curve); and 2.7, 1.8 and 1.8 h (median time to maximum plasma concentration). For Treatments 1, 3 and 4, the respective celecoxib PK parameters were 313, 449 and 284 ng ml –1 ; 2183, 3093 and 2856 ng h ml –1 ; and 1.5, 2.3 and 3.0 h. No unexpected adverse events were reported.    Conclusion  PK parameters of each API in CTC were modified by co‐crystallization compared with marketed formulations of tramadol, celecoxib, and their open combination.

british journal of clinical pharmacology

Single‐dose pharmacokinetics of co‐crystal of tramadol–celecoxib: Results of a four‐way randomized open‐label phase I clinical trial in healthy subjects