Thankfully Five hour energy drinks are relatively safe they contain about 100mg of caffeine and actually contain vitamins. I would just suggest your roommate doesn't drink more than 3 within a 6 hour period as this may be unsafe.
No it is not safe to drink 5 hour energy drinks all the time because these drinks have after effects that are harmful to the body and the body will start to become dependent on these drinks and when one stops their energy levels will be depleted.
