Ondansetron
[Zofran] First-line for OCD (very effective, well tolerated). May help binge drinking, bulimia.
Side Effects
Naltrexone
[Vivitrol] Opioid blocker treats alcohol and opioid use disorders (and, in combination with bupropion, meth). May help gambling addiciton and antipsychotic weight gain. Inj or oral.