i just been prescribed nal 50 mg 1 a day at nite. but my cravings start rite after work { 4:30pm} can i take a 1/2 at 4:00 & the other 1/2 around {9:00 pm}. i also thought you were to take it before you drink. if i wait till {11:00 pm } i already drank a 6 or more... please someone respond