Australian drug delivery company, Phosphagenics Ltd. announced that the first of its additional studies designed to further characterize the TPM/Oxymorphone patch, in support of an Investigational New Drug (IND) application with the FDA has been completed. The study was conducted on 15 healthy volunteers at Linear Clinical Research’s facility in Perth, it assessed additional pharmacokinetic parameters associated with the safety and elimination profile that were not addressed in the previous multiple dose Phase 1 study. The data generated will be used to help design the upcoming Phase 2 study, support the IND application and inform the eventual product label.
This single dose study unequivocally reproduced the outstanding results obtained in the previous Phase 1 study, both in terms of the oxymorphone delivery profile from the patch and the oxymorphone blood concentration in subjects. All 15 subjects achieved an oxymorphone blood concentration that was well above the minimum therapeutic blood level for the drug. The total number of subjects exposed to the TPM/Oxymorphone patch now stands at 27 with all patients attaining therapeutic oxymorphone blood levels.
Dr. Paul Gavin, chief scientific officer said, “The TPM/Oxymorphone patch has demonstrated reproducibility in two independent manufacturing and clinical trial campaigns with all subjects tested demonstrating blood concentrations equivalent to those produced by the commercially available oral dosage form. These studies clearly establish that the TPM/Oxymorphone patch has significant potential to be a remarkable product.”
“The latest study also provides new information regarding the elimination phase of oxymorphone after patch removal, an important variable in patient safety that is needed to determine the Phase 2 study design. As with any transdermal system, drug delivery ceased upon patch removal and residual drug in the body was eliminated steadily over time. This represents one of the key safety advantages of a transdermal opioid system compared to the oral dosage form. Accidental overdose (i.e. due to the application of multiple simultaneous patches) rarely occurs with a transdermal patch because of the ease of intervention (i.e. removal of the unintended patches and immediate cessation of delivery),” said Gavin.
Phosphagenics’ TPM/Oxymorphone patch development program for the next 18 months was previously described at this year’s Annual General Meeting and reiterated in an announcement to the market on 28 July 2014.This result represents the successful and timely completion of the first stage of additional research that was communicated to the market. Phosphagenics will shortly commence the second planned study which will compare the transdermal absorption of oxymorphone from application of the patch to different parts of the body. That study will inform the selection of appropriate sites for application of patches during Phase 2. Both characterisation studies have been designed to provide valuable information for potential licensees as well as various global regulatory bodies.
Phosphagenics expects to begin the Phase 2 trial in the USA during the first half of 2015 following the submission of an IND with the FDA.
Date: August 11, 2014
Filed Under: Drug Discovery