The ambien is a sleeping pill to take at bedtime, The prozac is an antidepressant and should be taken as ordered by the DR. Some people take 10 mg everyday some 20 mg, some 40 mg etc. And the ativan is for breakthrough anxiety or panic attacks. It should be used only then. If he is taking that one too often then I would make sure the Dr knows. He may want to increase the antidepressant. Good Luck.