Here is what DAN says:
Benzodiazepines
Medications in this group used to treat anxiety include: Alprazolam / Xanax, Chlordiazepoxide / Librium, Clonazepam / Klonopin, Clorazepate / Tranxene, Diazepam / Valium, Halazepam / Paxipam, Lorazepam / Ativan, Oxazepam / Serax, Prazepam / Centrax.
Side effects adverse to diving:
Drowsiness: A common side effect. Be sure you know how you react to this medicine before driving or using dangerous machinery.
Dizziness: Be careful about standing up quickly, going up and down stairs and driving.
Difficulty learning: An unusual side effect, it tends to go away quickly with continued use.
The whole article:
http://www.diversalertnetwork.org/me...p?articleid=38