Moxisylyte plasma kinetics in humans after intracavernous administration

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Abstract
Obtaining and sustaining an erection are common problems for the male spinal cord injury patient. Intracavernous injection of vasoactive substances offers a new treatment option but it must be approached with caution in this population. In this work, the use of an alpha‐adrenergic blocking agent, moxisylyte, after intracavernous administration for complete paraplegic patients with erectile impotence is described. During this study, the pharmacokinetic profile of moxisylyte has been defined. Unchanged moxisylyte is not found in plasma, this drug is immediately metabolized after administration. Three metabolites were found in plasma: desacetylmoxisylyte (DAM), conjugated DAM, and conjugates of desmethylated DAM (MDAM). Maximum plasma levels of 72·3 ng ml−1, 301·4 ng ml−1, and 88·8 ng ml−1 are obtained 0·22 h, 0·9 h, and 2·08 h after drug administration for these three metabolites, respectively. The elimination half‐lives are 0·89 h, 2·16 h, and 5·32 h and the MRT, 1·38 h, 3·23 h, and 8·45 h, respectively. No side‐effects were noted, only one patient presented sleepiness. Successful erections (10 to 25 min) were obtained in all patients and no priapism was noted.