Treatment of opioid use disorder in hospitalized patients

Case

A 35-year-old woman with opioid use disorder (OUD) presents with fever, left arm redness, and swelling. She is admitted to the hospital for cellulitis treatment. On the day after admission she becomes agitated and develops nausea, diarrhea, and generalized pain. Opioid withdrawal is suspected. How should her opioid use be addressed while in the hospital?

Dr. Anne Linker

Brief overview of the issue

Since 1999, there have been more than 800,000 deaths related to drug overdose in the United States, and in 2019 more than 70% of drug overdose deaths involved an opioid.^1,2 Although effective treatments for OUD exist, less than 20% of those with OUD are engaged in treatment.³

Dr. Michael Herscher

In America, 4%-11% of hospitalized patients have OUD. Hospitalized patients with OUD often experience stigma surrounding their disease, and many inpatient clinicians lack knowledge regarding the care of patients with OUD. As a result, withdrawal symptoms may go untreated, which can erode trust in the medical system and contribute to patients’ leaving the hospital before their primary medical issue is fully addressed. Therefore, it is essential that inpatient clinicians be familiar with the management of this complex and vulnerable patient population. Initiating treatment for OUD in the hospital setting is feasible and effective, and can lead to increased engagement in OUD treatment even after the hospital stay.

Overview of the data

Assessing patients with suspected OUD

Assessment for OUD starts with an in-depth opioid use history including frequency, amount, and method of administration. Clinicians should gather information regarding use of other substances or nonprescribed medications, and take thorough psychiatric and social histories. A formal diagnosis of OUD can be made using the Fifth Edition Diagnostic and Statistical Manual for Mental Disorders (DSM-5) diagnostic criteria.

Recognizing and managing opioid withdrawal

OUD in hospitalized patients often becomes apparent when patients develop signs and symptoms of withdrawal. Decreasing physical discomfort related to withdrawal can allow inpatient clinicians to address the condition for which the patient was hospitalized, help to strengthen the patient-clinician relationship, and provide an opportunity to discuss long-term OUD treatment.

Signs and symptoms of opioid withdrawal include anxiety, restlessness, irritability, generalized pain, rhinorrhea, yawning, lacrimation, piloerection, anorexia, and nausea. Withdrawal can last days to weeks, depending on the half-life of the opioid that was used. Opioids with shorter half-lives, such as heroin or oxycodone, cause withdrawal with earlier onset and shorter duration than do opioids with longer half-lives, such as methadone. The degree of withdrawal can be quantified with validated tools, such as the Clinical Opiate Withdrawal Scale (COWS).

Treatment of opioid withdrawal should generally include the use of an opioid agonist such as methadone or buprenorphine. A 2017 Cochrane meta-analysis found methadone or buprenorphine to be more effective than clonidine in alleviating symptoms of withdrawal and in retaining patients in treatment.⁴ Clonidine, an alpha2-adrenergic agonist that binds to receptors in the locus coeruleus, does not alleviate opioid cravings, but may be used as an adjunctive treatment for associated autonomic withdrawal symptoms. Other adjunctive medications include analgesics, antiemetics, antidiarrheals, and antihistamines.

^{Dr. Anne Linker}

Steps in addressing opioid use disorder in the inpatient setting

Opioid agonist treatment for opioid use disorder

Opioid agonist treatment (OAT) with methadone or buprenorphine is associated with decreased mortality, opioid use, and infectious complications, but remains underutilized.⁵ Hospitalized patients with OUD are frequently managed with a rapid opioid detoxification and then discharged without continued OUD treatment. Detoxification alone can lead to a relapse rate as high as 90%.⁶ Patients are at increased risk for overdose after withdrawal due to loss of tolerance. Inpatient clinicians can close this OUD treatment gap by familiarizing themselves with OAT and offering to initiate OAT for maintenance treatment in interested patients. In one study, patients started on buprenorphine while hospitalized were more likely to be engaged in treatment and less likely to report drug use at follow-up, compared to patients who were referred without starting the medication.⁷

Buprenorphine

Buprenorphine is a partial agonist at the mu opioid receptor that can be ordered in the inpatient setting by any clinician. In the outpatient setting only DATA 2000 waivered clinicians can prescribe buprenorphine.⁸ Buprenorphine is most commonly coformulated with naloxone, an opioid antagonist, and is available in sublingual films or tablets. The naloxone component is not bioavailable when taken sublingually but becomes bioavailable if the drug is injected intravenously, leading to acute withdrawal.

Buprenorphine has a higher affinity for the mu opioid receptor than most opioids. If administered while other opioids are still present, it will displace the other opioid from the receptor but only partially stimulate the receptor, which can cause precipitated withdrawal. Buprenorphine initiation can start when the COWS score reflects moderate withdrawal. Many institutions use a threshold of 8-12 on the COWS scale. Typical dosing is 2-4 mg of buprenorphine at intervals of 1-2 hours as needed until the COWS score is less than 8, up to a maximum of 16 mg on day 1. The total dose from day 1 may be given as a daily dose beginning on day 2, up to a maximum total daily dose of 24 mg.

In recent years, a method of initiating buprenorphine called “micro-dosing” has gained traction. Very small doses of buprenorphine are given while a patient is receiving other opioids, thereby reducing the risk of precipitated withdrawal. This method can be helpful for patients who cannot tolerate withdrawal or who have recently taken long-acting opioids such as methadone. Such protocols should be utilized only at centers where consultation with an addiction specialist or experienced clinician is possible.

Despite evidence of buprenorphine’s efficacy, there are barriers to prescribing it. Physicians and advanced practitioners must be granted a waiver from the Drug Enforcement Administration to prescribe buprenorphine to outpatients. As of 2017, less than 10% of primary care physicians had obtained waivers.⁹ However, inpatient clinicians without a waiver can order buprenorphine and initiate treatment. Best practice is to do so with a specific plan for continuation at discharge. We encourage inpatient clinicians to obtain a waiver, so that a prescription can be given at discharge to bridge the patient to a first appointment with a community clinician who can continue treatment. As of April 27, 2021, providers treating fewer than 30 patients with OUD at one time may obtain a waiver without additional training.¹⁰