Pharmacokinetics, safety and tolerability of a novel tocopheryl phosphate mixture/oxycodone transdermal patch system: a Phase I study

Aim: To characterize the pharmacokinetic profile and evaluate the safety and tolerability of a transdermal oxycodone patch containing tocopheryl phosphate mixture (TPM). Patients & methods: Eleven healthy subjects received a single application of three TPM/oxycodone patches applied to the torso for 72 h. Results: Oxycodone was detected 8.0 ± 2.7-h postpatch administration, reaching a mean maximum plasma concentration of 3.41 ± 1.34 ng/ml at 49.3 ± 21.2 h. The safety profile was consistent with the application method and known side-effect profile of oxycodone and naltrexone. No treatment-limiting skin irritation was observed. Conclusion: A 3-day application of the TPM/oxycodone patch demonstrated an acceptable safety profile and was well tolerated by healthy subjects, with limited dermal irritation following application.