To evaluate long-term treatment with ziprasidone versus haloperidol (up to 196 weeks), as assessed by PANSS negative score and and its association with quality-of-life (QLS).

The study included two treatment periods: (i) a 40-week, randomized, double-blind phase comparing ziprasidone (ZIP 80-160 mg/d given BID, N=227; ZIP 80-120 mg/d given QD, N=221) versus haloperidol (HAL 5-20 mg/d, N=151), followed by (ii) a 3-year, double-blind extension phase on the same double-blind medications (ZIP BID N=72, ZIP QD N=67, and HAL N=47, respectively). We adapted the Andreasen et al. approach to define negative symptom remission based on attainment of a score ≤3 (mild or less) for at least 6 months on all 7 PANSS negative symptom items. MMRM and GEE models were applied to analyze mean changes in PANSS negative, negative symptom remission rate, and QLS scores over time.

In the 40-week core study, ziprasidone was associated with greater improvement in efficacy and QLS outcomes than haloperidol, but the differences were not statistically significant (p>0.05). However, MMRM analysis of PANSS negative and QLS scores over 196 weeks demonstrated differential treatment effects favoring ziprasidone (80-160 mg/d BID vs. haloperidol) (all p<0.05). Ziprasidone-treated subjects (given BID) were significantly more likely to achieve negative symptom remission (46%) than haloperidol-treated (32%) subjects (p<0.05) during the continuation phase; while ziprasidone given QD (46%) showed a trend to enhanced remission (p<0.08).

These findings support the potential for enhanced social and functional outcomes during long-term treatment with an atypical antipsychotic agent.