What would happen if I drank alcohol while taking Concerta and Cymbalta?

I am currently taking Cymbalta 60 mg and have been for almost 1 year. I am also taking Concerta 17 mg. I have been taking it since March of this year. I am going on a trip soon and will probably be drinking beer. I was wondering if there would be any interactions and if so what they would be. If anyone has any answers I would appreciate knowing!!