 Will modephanal make you limitless? Well modephanal is a prescription drug used for treating sleep apnea, narcolepsy and sleep disorders, but healthy individuals use it to boost their brain power and energy because it is a very potent stimulant. Now if you take modephanal, it's gonna give you an additional six to twelve hours of energy, which is just amazing, but personally I do not recommend taking it daily because of the severe side effects that can cause like anxiety, depression and really strong headaches. Personally, I can obtain it legally and therefore I use it now and then to cover my peaks, but that's about it.