Can you take Cymbalta Valium and oxycodone together?

Yes, you can but you will want to go lower on each drug on your regular dosage level. If you haven't had either, I would not recommend this or start VERY LOW.

If you are prescribed both medications, talk to your pharmacist or physician before taking both medications at the same time. It may be wise to ensure there is someone near by who can check on you periodically.