Opioid Detox Medications: What Each One Does, When It Is Given, and What Withdrawal Feels Like With It

Opioid withdrawal without medication is a week of vomiting, cramping, bone pain and cravings that most people cannot get through, and the relapse that ends it is where the overdose risk lives. With medication it is survivable, and for many people it becomes the start of a treatment that continues for months. This page goes through the medications used in opioid detox, one by one: what each does, when it is given, why fentanyl changes the timing, and which ones continue after the stay.

Buprenorphine relieves opioid withdrawal by partially activating the same receptors the opioid did, enough to stop the symptoms and cravings without producing the high, and it can be continued after detox as long-term treatment.

It is the center of modern opioid detox. Because it is a partial agonist, it has a ceiling: more does not produce more effect past a point, which is why it is far safer in overdose than a full opioid and why it can be prescribed outside a specialized clinic.

The National Library of Medicine notes that it treats withdrawal, can shorten the length of detox, and can be used for long-term maintenance like methadone. It is usually combined with naloxone in the film or tablet form, as in Suboxone, so that injecting it produces withdrawal rather than a high; taken as directed, the naloxone does nothing. The opioid detox program page describes how Briarwood uses it across the stay.

Source: Opiate and opioid withdrawal, MedlinePlus Medical Encyclopedia, National Library of Medicine.

Fentanyl changes the medication plan because it accumulates and clears slowly, so standard buprenorphine timing precipitates withdrawal; the answer is a micro-induction, starting small and stepping up over days.

Most of what is sold as heroin or as pressed pills now contains fentanyl, so most people arriving for opioid detox are, whether they know it or not, fentanyl-dependent. The label’s warning about long-acting opioids applies to them.

The micro-induction approach starts buprenorphine in very small doses while the fentanyl is still clearing, so that it eases withdrawal instead of triggering it, and steps up to a full dose over several days. It means fentanyl detox often runs longer than the classic five to seven days, and it means the first days are more comfortable than they would be under the old protocol. The micro-induction protocol page describes how Briarwood does it.

Comfort medications in opioid detox treat the symptoms that make the week unbearable: anti-nausea medication, an anti-diarrheal, muscle relaxants or anti-inflammatories for the aches, and a sleep aid.

None of them treat the withdrawal itself; they treat the parts of it that lead people to give up. Nausea and diarrhea together also cause dehydration and electrolyte disturbance, which the National Library of Medicine names as a complication of opioid withdrawal, so fluids and electrolytes are part of the picture too. What a person is given and when depends on what they report, which is why nursing rounds ask the same questions at every visit: are you sleeping, are you keeping food down, where does it hurt.

Naltrexone is an opioid blocker started after detox, once the system is clear of opioids, to prevent relapse; given too early it precipitates withdrawal, so the timing of the first dose is a medical decision.

The National Library of Medicine notes that naltrexone can help prevent relapse, is available as a daily pill or a monthly injection, and can bring on a sudden and severe withdrawal if taken while opioids are still in the system. The National Institute on Drug Abuse describes the monthly injection, Vivitrol, as approved to prevent relapse following opioid detoxification and as a way around the adherence problem that limited the daily pill.

It is the choice for people who want to be off all opioids, including buprenorphine, after detox. The catch is the gap: a person has to be fully withdrawn before the first dose, which for fentanyl can mean a longer wait, and the days between are high-risk. Detox is where that gap is bridged safely.

Buprenorphine or naltrexone usually continues after detox, because most opioid overdose deaths occur in people who have just detoxed and medication is the strongest protection against that relapse. That warning is the National Library of Medicine’s.

Detox lowers tolerance, so a dose that was routine becomes fatal, and the weeks after discharge are the most dangerous a person will face. Continuing buprenorphine with an outpatient prescriber, or starting naltrexone once the system is clear, is what medication for opioid use disorder means, and the National Institute on Drug Abuse’s finding is that combining it with behavioral treatment is the most effective approach for many people. Briarwood arranges the prescriber and the first appointment before discharge, alongside residential treatment, an intensive outpatient program or sober living, and the what comes after detox page lays the options out. Everyone should also leave with naloxone.