What it is. How to avoid it.
What Is Precipitated Withdrawal?
It is a rapid and intense onset of withdrawal symptoms initiated by a medication. In the case of Buprenorphine, because it has a higher binding strength at the opioid receptor, it competes for the receptor, “kicks off” and replaces existing opioids. If a significant amount of opioids are expelled from the receptors and replaced, the opioid physically dependent patient will feel the rapid loss of the opioid effect, initiating withdrawal symptoms.
More precisely, precipitated withdrawal can occur when an antagonist (or partial agonist, such as Buprenorphine) is administered to a patient who is physically dependent on full agonist opioids. Due to the high affinity but low intrinsic activity of Buprenorphine at the μ-receptor, the partial agonist displaces full agonist opioids from the μ-receptors, but activates the receptor to a lesser degree than full agonists which results in a net decrease in agonist effect, thereby precipitating withdrawal.1
A common misconception is that the naloxone in the buprenorphine/naloxone combination medication initiates precipitated withdrawal. Naloxone may only initiate withdrawal if injected into a person physically dependent on opioids. Taken sublingually, as directed, naloxone is clinically insignificant and has virtually no effect. (Except in rare cases of an allergic reaction or naloxone hypersensitivity.2)
“Information provided by NAABT, copyright 2011 – “Precipitated Withdrawal. What is it. How to Avoid it.””
Avoiding Precipitated Withdrawal
Patient education and developing realistic expectations are essential before beginning treatment.
To avoid precipitated withdrawal, physically dependent patients must no longer be experiencing the agonist effects of an opioid. One way to gauge this is to observe objective symptoms of withdrawal sufficient to score a minimum of 5 to 6 on the COWS (Clinical Opioid Withdrawal Scale). Scores of >10 are preferable. Due to patient individuality, required abstinent times may vary considerably from patient to patient. Only use the time since last use as an estimate to anticipate the onset of withdrawal symptoms.4
The induction begins by assessing last use of all opioids, short and long acting, objective and subjective symptoms and a COWS score calculation. If not in sufficient withdrawal (mild to moderate: COWS of 5 to 24), it is in the patient’s best interest to wait. Long-acting opioids will require a longer period of abstinence, than short-acting opioids.
(Heroin, Crushed OxyContin®, Percocet®, Vicodin®, Oxycodone and others)
Prior to induction, patients must abstain from all short-acting opioids for 12 to 24 hours and/or have objective withdrawal symptoms sufficient to produce a score of 5 to 24 on the COWS.1
OxyContin® (Taken Orally)
Discontinue use for at least 24 hours prior to induction. A minimal score of at least 5 on the COWS is recommended, although some physicians prefer scores of 15 or higher.5
It is recommended that patients transitioning from methadone to Buprenorphine slowly taper to 30 mg/day of methadone, for at least one week. Last dose must be no less than 36 hours prior to induction, and may be 96 hours or more. A minimal score of at least 5 on the COWS is recommended, although some physicians prefer scores of 15 or higher.5
Patients transferring from methadone or another long-acting opioid to Buprenorphine may experience discomfort for several days and dysphoria for up to 2 weeks.3
The goal of induction is to safely suppress opioid withdrawal as rapidly as possible with adequate doses of Buprenorphine. Failure to do so may cause patients to use opioids or other medications to alleviate opioid withdrawal symptoms or may lead to early treatment dropout.3 To achieve this, some physicians have found they may need to dose as high as 32 mgs the first day with some methadone to Buprenorphine transfers.5