Better think twice before doing this. Vicodin contains hydrocodone, and if this is taken together (in the same time or one soon after the other) with other drugs the combined effect might be increased, decreased or altered. So don’t take Valium and Vicodin together, unless you consulted with your doctor and he recommended such a combination.
The increased/decreased or altered effect of taking Vicodin happens when combining it with anti-anxiety drugs such as Valium or Librium, so better take them at different time intervals (depending on how it was prescribed, every 6-8 hours).


