Affects of alcohol on duromine

I know that one should not drink alcohol while taking duromine - question is why? What happens?

Not sure, I know for a fact our bodies react differently to substances but I'm on Duromine and just had 5 ciders and feel fine .
Surprised though, usually I'd be tipsy by now but instead I'm not, just feel energetic and very happy ! I've been cracking jokes all night and in the best mood ever!
I'm not encouraging the simultaneous intake of Duromine and alcohol cause it might end differently for someone else. Better safe than sorry. With me it was an accident, it is only my second day on the pill and I take it the minute I wake up so when I met with friends after work I totally forgot I took the pill and had drinks, it only hit me on my fourth drink and I felt ok so just continued.