My pdocs say it is absolutely no problem to have drinks on meds, as long as you have an alcohol free day every 10 days or so and do not go on a binge every night. But I come from a country where drinking alcohol is more acceptable than drinking soft drink. I dont see a problem with one drink, if it were 6 then yeah maybe but one is barely going to have any affect on your meds or mood unless you are really sensitive.