It is unclear whether there is any difference in efficacy between these variants, except from the fact that about 10% more mass of sodium valproate is needed than valproic acid without sodium to compensate for the sodium itself. Brand names of valproic acid
Branded products include:

Brand names of sodium valproate
Portugal
Tablets – Diplexil-R by Bial. United States
Intravenous injection – Depacon by Abbott Laboratories. Syrup – Depakene by Abbott Laboratories. (Note Depakene capsules are valproic acid). Depakote tablets are a mixture of sodium valproate and valproic acid. Tablets – Eliaxim by Bial. Australia
Epilim Crushable Tablets Sanofi
Epilim Sugar Free Liquid Sanofi
Epilim Syrup Sanofi
Epilim Tablets Sanofi
Sodium Valproate Sandoz Tablets Sanofi
Valpro Tablets Alphapharm
Valproate Winthrop Tablets Sanofi
Valprease tablets Sigma

New Zealand
Epilim by Sanofi-AventisAll the above formulations are Pharmac-subsidised. UK
Depakote Tablets (as in USA)
Tablets – Orlept by Wockhardt and Epilim by Sanofi
Oral solution – Orlept Sugar Free by Wockhardt and Epilim by Sanofi
Syrup – Epilim by Sanofi-Aventis
Intravenous injection – Epilim Intravenous by Sanofi
Extended release tablets – Epilim Chrono by Sanofi is a combination of sodium valproate and valproic acid in a 2.3:1 ratio. Enteric-coated tablets – Epilim EC200 by Sanofi is a 200-mg sodium valproate enteric-coated tablet.
"FDA warns of rare but serious risk of heart attack and death with cardiac nuclear stress test drugs Lexiscan (regadenoson) and Adenoscan (adenosine)". U.S. Food and Drug Administration (FDA). 12 January 2017.