I am sorry but she prescribed 1 tablet every 8 hours... And I did take it a little earlier just one hour earlier. Only to try to get some sleep when this severe it seems sleep is best for me... And I've been on Lorbab's since 2001 from an accident and just went up to lortab 10mg about 2007... I have had about 30 nerve blocks and radio frequency of about 9 nerves. and that was in 2001 tp 2004... And even with the lortab 10 mg at three times a day. Only took the lortab 10 mg three times a day only as needed... Would usually try to get by with two lortabs a day... So no don't want to depend on it... my Dr thinks I might have a back compression fracture. And talking about doing a Kyroplasty...