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.
India, Russia and CIS countries
Valparin Chrono by Sanofi India
Valprol CR by Intas Pharmaceutical (India)
Encorate Chrono by Sun Pharmaceutical (India)
Serven Chrono by Leeven APL Biotech (India)

Brand names of valproate semisodium
Brazil – Depakote by Abbott Laboratories and Torval CR by Torrent do Brasil
Canada – Epival by Abbott Laboratories
Mexico – Epival and Epival ER (extended release) by Abbott Laboratories
United Kingdom – Depakote (for psychiatric conditions) and Epilim (for epilepsy) by Sanofi-Aventis and generics
United States – Depakote and Depakote ER (extended release) by Abbott Laboratories and generics
India – Valance and Valance OD by Abbott Healthcare Pvt Ltd, Divalid ER by Linux laboratories Pvt Ltd, Valex ER by Sigmund Promedica, Dicorate by Sun Pharma
Germany – Ergenyl Chrono by Sanofi-Aventis and generics
Chile – Valcote and Valcote ER by Abbott Laboratories
France and other European countries — Depakote
Peru – Divalprax by AC Farma Laboratories
China – Diprate OD

References
External links
"Valproic acid". Drug Information Portal. U.S. National Library of Medicine. "Valproate sodium". Drug Information Portal. U.S. National Library of Medicine. "Divalproex sodium". Drug Information Portal. U.S. National Library of Medicine.