anti-depressants and Anti-anxiety agents  Antidepressants and anti-anxiety medications can be used for treatment of conditions including depression, anxiety, OCD and chronic pain. Examples include Prozac, Zoloft, Lexapro, Effexor, Cymbalta, and Gabapentin. Discontinuation syndrome can occur when individuals abruptly stop taking these medications. Symptoms include nausea, vomiting, diarrhea, headaches, sweating, sleep disturbances, dizziness, tremors and mood instability.