Good catch Mark:
This one is generic Welbutrin,dopamine reuptake inhibitor.
Bupropion
http://en.wikipedia.org/wiki/Bupropion
Looks like the next one is a serotonin reuptake inhibitor.
http://www.drugbank.ca/drugs/DB01142
Next is mesalamine
http://www.aprisorx.com/?gclid=CN-W0oL2prUCFU-d4AodThcA5w
Well since he was taking a UC drug,don't know.
Anyhow my wild guess is that the mixture was increasing neurotransmitters in general.
http://en.wikipedia.org/wiki/Reuptake