Had abit to drink last night im on citalopram what will happen?feel really hungover today

It should pass: It should pass in a few hours. Probably more related to what you drank and how much than the citalopram. When on these medications abstinence is best, but moderation is key. I wouldn't recommend overdoing it repeatedly.

Hangover: We cannot respond to your question when you do not even provide us with your age let alone other medical conditions. If you are hungover, you likely had more than "a bit" to drink. We also can't predict what will happen to you. You are encourage to hydrate and rest today and refrain from further alcohol use.

Need more info: I would suggest calling the doctor who prescribes the citalaprem. Avoid alohol when on psychiatic medications.