Steroid Half Lives: A proven guide on how to calculate half lives

Steroid Half Lives

Steroid Half lives - anyone new to steroids may be wondering what this means, even some steroid users may also be wondering what this means. So here in simple terms you can read and hopefully understand all about steroid half lives and what this term means.

How to calculate half lives

Basically every drug has a half live, steroids included. If for example, you were to inject 200mg of Decadurabolin once weekly, for 6 weeks, how would you know when you were "off"? Would you be "off" when you had finished your last dose? You would be able to calculate this from the half live of Deca. The half live of Deca is around 14 days. This means that 14 days from your last shot of 200mg of Deca, your blood levels of Deca will contain 100mg of the steroid. Another 14 days from then, i.e. 28 days from last dose, your blood levels will contain 50mg of the steroid. This amount then keeps halving every 14 days. Therefore you can clearly see that when you finish your cycle, even though you are not putting any steroids into your body, you may think that you are now "off", however you still have, and will still have for some time after your last dose, "active" blood levels of the steroid. Therefore you can plan what to use, how long for, and how long off your cycle, based on these half live's.

Below a list of half-live's of the most commonly used steroids, esters and ancillary compounds.

Oral steroids Drug Active half-live

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

Depot steroids Drug Active half-live 

Deca-durabolin (Nandrolone decanate) 14 days 
Equipoise 14 days 
Finaject (trenbolone acetate) 3 days 
Primobolan (methenolone enanthate) 10.5 days 
Sustanon or Omnadren 15 to 18 days 
Testosterone Cypionate 12 days 
Testosterone Enanthate 10.5 days 
Testosterone Propionate 4.5 days 
Testosterone Suspension 1 day 
Winstrol (stanozolol) 1 day

Steroid esters Drug Active half-live 

Formate 1.5 days Acetate 3 days 
Propionate 2 days 
Phenylpropionate 4.5 days 
Butyrate 6 days Valerate 7.5 days 
Hexanoate 9 days Caproate 9 days 
Isocaproate 9 days 
Heptanoate 10.5 days 
Enanthate 10.5 days 
Octanoate 12 days Cypionate 12 days 
Nonanoate 13.5 days 
Decanoate 15 days 
Undecanoate 16.5 days

Ancillaries Drug Active half-live 

Arimidex 3 days 
Clenbuterol 1.5 days 
Clomid 5 days
 Cytadren 6 hours 
Ephedrine 6 hours T3 10 hours