Just like all of our fellow brothers are saying hear it needs to be taken every day.. not just because of half life but also because of the response that you are trying to initiate between cellular groups.. you want to have the plasma levels as high as you can for as long as possible even when they drop you want to try to bring the serum levels back up again as frequently as possible, the longer the time span between and takes the less effective it would be.. you can use this drug once a day but when you begin to use it less frequently it no longer represents the property's you are seeking..
When people say they take it occasionally for pre-workout and they feel it, all they are feeling is an increase with blood pressure..they are not feeling the drug because this drug does not work like that..
However you can take your normal dosage on workout days but on days you're off you can lower your dosage but just keep the hormone in you at a minimum of once a day.. because drugs like these operate through numerous functions and you need to keep that chit chat and activation up and open..