its a methylated oral steroid... they all cause eventual lethargy, especially if your using one without test... you MUST use an ai with dbol and i would use nothing less than aromasin with that... you also need to protect yourself from the methylation... when your liver starts to be negatively impacted, it rejects the methylation from the oral and it makes you very lethargic as well... you need full protection with n2guard, a strong ai with aromasin and a test base or hcgenerate... this will help mitigate the problems and if you add sarms to the stack, you will bring on the strongest sense of well being that can be provided and that will also help to provide endurance and energy as well as cleaner gains...