Modafinil - Can I drink moderately on modafinil?

Yes, you can but check with your doctor or pharmacist first.
From the Interaction Checker:
"No interactions were found between the drugs in your list. However, this does not necessarily mean no interactions exist. Always consult your health care provider."

Short answer is yes.

The slightly longer answer is in moderation. But it’s not as some would assume is your liver.
modafinil will allow you to drink more without thinking you are drunk.
You will find yourself drinking too much without THINKING you are, let us say over the top. And you will talk incessantly and make an asshole of yourself. You will butt into conversations and lose your social sensitivity to what is appropriate and what is not. You may inadvertently think your opinions are more important than others. The social graces will fail you and you will try to dominate the conversation and you can hurt other peoples feelings. I hope that helps you “Desert Lady”