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    Thread: Active Half-life of Steroids and Esters

    1. #1
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      Active Half-life of Steroids and Esters

      An*important consideration when planning a steroid cycle, in particular the timing of dosing to be administered, is the active half-life of the drug being employed. The half-life may be defined as the time (t) the level is half of the starting level of a given compound; at time 2t, the level is a quarter of the starting level, and at time 3t, the level is an eighth of the starting level, and so on. This information is vital in the timing of the dosing when attempting to achieve a more stable blood concentration, which leads to greater overall results and maintenance of gains. Some fluctuations of concentration levels are acceptable, and are also mostly unavoidable, but should be kept to a minimum. This article covers the half-life's of the most commonly used steroids, esters and ancillary compounds.

      Oral steroids

      DrugActive half-life Anadrol / Anapolan50 (oxymetholone)8 to 9 hours

      Anavar (oxandrolone)9 hours

      Dianabol (methandrostenolone, methandienone)4.5 to 6 hours

      Methyltestosterone 4 days

      Winstrol (stanozolol) (tablets or depot taken orally)9 hours

      Steroid esters The half-life applies to the ester regardless of hormone attached, for example trenbolone enanthate and primobolan (methenolone enanthate) will act very similarly to testosterone enanthate in terms of release rate.*

      DrugActive half-life

      Suspension within 1 hour Acetate1 day

      Propionate1 day

      Phenylpropionate 1-2 days

      Butyrate 2-3 days

      Valerate 3 days

      Hexanoate 3 days

      Caproate 4-5 days

      Isocaproate 4-5 days

      Heptanoate 5-6 days

      Enanthate 5-6 days

      Octanoate 6-7 days

      Cypionate 6-7 days

      Nonanoate 7 days

      Decanoate 7-8 days

      Undeclenate 8-9 days

      Undecanoate Approx 20 days

      *

      Ancillaries

      DrugActive half-life

      Arimidex 3 days

      Clenbuterol 1.5 days

      Clomid 5 days

      Cytadren 6 hours

      Ephedrine 6 hours

      T3 10 hours

      *

      A practical example is if one was to inject 100mg of testosterone propionate and allow blood levels to peak. In approx 36 hours time (half-life duration from the above tables) and providing no other injections had taken place, the level would be reduced to 50mg. Again, a further approx 36 hours down the line and levels would have dropped to 25mg, and the value keeps halving every approx 36 hours.*
      https://i.imgur.com/nL1nlEp.gif

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      Nice. Always a nice refresher read.

      Nice avi, by the way dig that colour on your skin tone! And you've leaned out a lot!

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      Nice reference sheet.

      Thx. MB.



      JMcF.

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      Good stuff!!

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