Formestane (Lentaron) acts as a prohormone of 4-Hydroxytestosterone, as 4-Hydroxytestosterone is one of the many byproducts of formestane metabolism. It is specifically the 17-hydroxylated analog to formestane. [1] Like formestane, 4-hydroxytesterone has been patented for use in decreasing estrogen production in the body, but no such indication currently exists. 4-Hydroxytestosterone was first patented in 1955 by G.D Searle & Company."""@en ; dct:identifier "drugbank:DB01485" ; dct:title "4-Hydroxytestosterone"@en ; adv:Drug ; rdfs:label "4-Hydroxytestosterone [drugbank:DB01485]"@en ; rdfs:seeAlso <http://www.drugbank.ca/drugs/DB01485> . }