The Clinical Opiate Withdrawal Scale (COWS) is an 11-item clinician-administered instrument developed by Wesson and Ling (2003) to rate the severity of opioid withdrawal and guide buprenorphine induction (Journal of Psychoactive Drugs, 35(2):253–259). Items capture objective signs and subjective symptoms such as pulse rate, sweating, restlessness, pupil size, bone/joint aches, runny nose, GI upset, tremor, yawning, anxiety/irritability, and gooseflesh, yielding a total score from 0 to 47. The COWS has strong concurrent validity with the Clinical Institute Narcotic Assessment (CINA) and is the standard tool for timing medication-assisted treatment (MAT) induction. Zentake offers a digital, auto-scoring COWS clinicians can complete bedside in under two minutes.
Each of the 11 items is scored on an anchored scale (most 0–4, with a few 0–5). Sum all items for a total between 0 and 47. Wesson and Ling proposed the following severity cutoffs:
Zentake automatically calculates COWS total and severity category upon form submission and flags the induction-ready threshold for MAT protocols.
Step 1: Observe and measure objective signs — resting pulse, pupil size, sweating, tremor, yawning, and gooseflesh. Zentake's mobile-friendly form keeps anchored descriptors inline so raters don't need a reference card.
Step 2: Ask the patient about subjective symptoms — GI upset, bone/joint aches, anxiety, and restlessness. Digital entry prevents transcription errors.
Step 3: Submit and auto-score. Zentake calculates total and severity the moment the form is completed.
Step 4: Use the score to guide MAT timing. Scores of roughly 8–12+ indicate sufficient withdrawal for safe buprenorphine induction.
Step 5: Reassess serially during induction and stabilization. Zentake timestamps each administration and displays the trend.
Scoring: Paper requires manual tallying mid-induction; Zentake auto-calculates the total and severity instantly. Completion: Bedside tablet entry is faster and legible. Delivery: Secure link to any staff device. Data Storage: Encrypted and searchable vs. loose flowsheets. Longitudinal Tracking: Serial COWS scores charted automatically. Security: HIPAA-compliant with audit logs. Integration: Scores flow to the EMR. Cost: Eliminates printing and transcription time.
What does the COWS measure? The COWS rates the severity of opioid withdrawal across 11 objective and subjective signs. Zentake's digital COWS auto-scores the total and severity category.
How do you score the COWS? Sum the 11 anchored items for a total of 0–47. Scores of 5–12 indicate mild withdrawal, 13–24 moderate, 25–36 moderately severe, and >36 severe. Zentake automates this.
How long does the COWS take? A trained clinician completes the COWS in under two minutes. Zentake's digital version is similarly fast with instant scoring.
Is the COWS free to use? Yes — the COWS is freely available for clinical use. Zentake charges only for the secure digital platform.
What population is the COWS for? The COWS is validated for adults experiencing or suspected of experiencing opioid withdrawal in clinical settings.
Who should administer the COWS? Trained clinicians — physicians, nurses, or addiction counselors — administer the COWS at the bedside.
What COWS score is needed to start buprenorphine? A score of approximately 8–12 or higher generally indicates sufficient withdrawal to begin buprenorphine induction without precipitating worse withdrawal.
How often should the COWS be repeated? COWS is reassessed serially during induction and stabilization, commonly every 1–2 hours until the patient is stable. Zentake timestamps and trends each administration.
Last updated: March 2026
The leading patient intake platform. HIPAA compliant forms for healthcare providers and organizations. Find out what you're missing!
