Jun 30, - With weed what effect do you get when taking Xanax or any other Benzoos? Thanks I've tried valium + weed and klonopin + weed. For me Effects - - Valium Recreational Use? Using diazePAM together with cannabis (Schedule I substance) may increase side effects such as dizziness, drowsiness, confusion, and difficulty concentrating. Jul 20, - Before you take other drugs alongside cannabis, you should make sure there which are arguably the most distressing potential side effects, vary from Zyrtec, Claritin, Alavert); Muscle Relaxants (Valium, Soma, Baclofen).