The Drug Enforcement Administration's Special Testing and Research Laboratory generated the following monographs using structurally confirmed reference materials. These monographs are intended to be used for the verification of acquired reference materials. Monographs are being uploaded as they are technically reviewed and approved for publication. In addition, links to monographs authored by Forensic Drug Review are provided below . For those monographs that refer to a TLC method number, please click on the TLC Systems link for more information.
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Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.