Also this about Ambien (which is zolpidem)-
"As is the case with many prescription sedative/hypnotic drugs, zolpidem is sometimes used by stimulant users to "come down" after the use of stimulants such as methamphetamine, cocaine, methylenedioxymethamphetamine (MDMA), or pharmaceutical amphetamines."
Oh, it just gets worse... I'm sure he'll cooperate fully - after a couple days of letting things in his bloodstream calm down.