I started taking this drug on June 23rd and am up to 3-8mg tablets daily at bedtime. After going up to a higher dosage it started helping my panic episodes more than anything else had for quite awhile. I take it at bedtime to help with sleep but I also take Ambien, Nortripyline, Amitripyline and Xanax. Are you taking other medications along with the Perphenazine?