Can Immovane And Ativan Mixed With Alcohol Cause A Right

Can immovane and Ativan mixed with alcohol cause a right side crashing with his car two weeks in a row...he said he had two drinks and his meds are prescribed for anxiety and sleeping for years...he took the ditch both times in a ditch one week after the other...both times he hit the ditch passenger side...he is being charged with DUI....he says he doesn't remember the accident...just woke up in handcuffs...Iwe noticed these meds are not making him better but are asking if hhis right peripheral vision is affected with these meds.