There is no specific interaction between Concerta and alcohol, it is a good idea to avoid alcohol until you know how Concerta will affect you. Taking Concerta with alcohol might affect ones ability to drive or operate heavy machinery. Also, it is usually not a good idea to take Concerta if you have a history of drug or alcohol abuse.
It is also important to note that people with problems with alcohol abuse should probably avoid Concerta. Concerta is a stimulant and can be abused. People who have problems with drug or alcohol abuse may be more likely to abuse Concerta.
There is more of an interaction between Lexapro vs Concerta.
But everyone has a different interaction with alcohol and medication. I would suggest in going to a doctors visit with her, and bring this up to her doctors attention.
Hope this helps
