Flexorall symptoms and conditions

My father was prescribed Ambien due to some sleeping issues. It was prescribed to take "as needed". He was also prescribed flexorall which is a muslce relaxor. After taking the Ambien for awhile he started becoming more agitated than usual and was having nightmares. Then one Sunday morning he got up and was in his usual routine of drinking coffee & reading the paper. He got the hiccups and got up to get a glass of water but when he went into the kitchen he poured more coffee into a glass. He then was stumbling around and twice almost fell. His behavior became stranger and so my mother took him to the ER. They thought he possible had a stroke. He doesn't remember any of that morning until he was at the hospital. After several test it turns out, it was all a side effect of taking the Ambien, Flexorall & drinking a beer the night before. After looking at the side effects on the computer, he had most of them and should not have been taking the muscle relaxer & sleep aid together.