This is a multicenter, randomized, double-blind, placebo-controlled study to assess the potential of physical withdrawal from CR845 upon treatment discontinuation after 3 weeks of IV administration at a dose of 0.5 mcg/kg in hemodialysis patients. The purpose of this study is to determine whether hemodialysis patients who take CR845 develop physical dependence and experience withdrawal symptoms upon cessation, as exemplified by symptoms consistent with opioid withdrawal. The study will consist of a Screening Phase, a 3-week Open-label Phase, a 2-week randomized, placebo-controlled, Double-blind Phase and a Follow-up Visit.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
35
IV CR845 0.5 mcg/kg as a bolus injection
IV Placebo as a bolus injection
Cara Therapeutics Study Site
Bridgeport, Connecticut, United States
Cara Therapeutics Study Site
Hartford, Connecticut, United States
Cara Therapeutics Study Site
Kansas City, Kansas, United States
Cara Therapeutics Study Site
Roseville, Michigan, United States
Cara Therapeutics Study Site
Minneapolis, Minnesota, United States
Treatment difference between placebo and CR845-treated group with respect to the maximum Clinical Opiate Withdrawal Scale (COWS) score over Weeks 1-4
Time frame: Week 1-4
Treatment difference between placebo and CR845-treated group for COWS score at Week 4.
Time frame: Week 4
Treatment difference between placebo and CR845-treated group for COWS score at Week 5.
Time frame: Week 5
Treatment difference between placebo and CR845-treated group for maximum Subjective Opiate Withdrawal Scale (SOWS) score over Weeks 1-4
Time frame: Week 1-4
Treatment difference between placebo and CR845-treated group for SOWS score at Week 4.
Time frame: Week 4
Treatment difference between placebo and CR845-treated group for SOWS score at Week 5.
Time frame: Week 5
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