Quick question - if you have an urge to drink but you didn't take the pill, is it less harm if you start drinking, then take a pill and then keep drinking?

Yes, it's less harm. But best is to completely block the endorphins right from the start, so you don't send your brain a mixed message.

I see. Could you please also respond to my messages in my topic titled "My drinking habit"?

Done, you should be able to read my reply now.