How to calculate half lives

How to calculate half lives

Basically every drug has a half live, steroids included. If for example, you were to inject 250mg of Nandrolone Decanoate 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 250mg of Deca, your blood levels of Deca will contain 125mg of the steroid. Another 14 days from then, i.e. 28 days from last dose, your blood levels will contain 62,5mg 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:

Injectable steroids:

Steroid esters: