Individuals taking such common antidepressants as Celexa, Paxil, Lexapro, Prozac and Zoloft are twice as likely to have dental implants fail compared to those not on the drugs, a new Canadian study reveals. Researchers found a 10.64 percent rate of failure in patients taking the drugs compared with a 4.62 percent rate in those without. ABC New Radio. Posted Sept 15, 2014.