<p>The plasma clearance of cysteamine is about 1.2 - 1.4 L/min.<sup class="text-reference-group"><a class="reference-popover-link" data-content="FDA approved products: PROCYSBI (cysteamine bitartrate) delayed-release oral capsules" href="#reference-L15616">12</a></sup> One reference mentions a clearance of 89.9 L/h in patients with Cystic Fibrosis.<sup class="text-reference-group"><a class="reference-popover-link" data-content="Devereux G, Steele S, Griffiths K, Devlin E, Fraser-Pitt D, Cotton S, Norrie J, Chrystyn H, O'Neil D: An Open-Label Investigation of the Pharmacokinetics and Tolerability of Oral Cysteamine in Adults with Cystic Fibrosis. Clin Drug Investig. 2016 Aug;36(8):605-12. doi: 10.1007/s40261-016-0405-z. (PubMed ID 27153825)" href="#reference-A218941">6</a></sup></p>