Shouldn’t I feel better when I take Suboxone?
You should feel better when you take Suboxone after quitting opioids, and most people do. Yet, the first dose can make you feel worse, and when it does, the reason is almost always timing.
Suboxone is a complicated drug. Its main ingredient, buprenorphine, is a partial opioid agonist, meaning that it stimulates the opioid receptor, but only partway, and it holds onto that receptor tightly and does not let go.
That tight grip is the problem on day one. If a full opioid such as heroin, oxycodone, or fentanyl is still sitting on your receptors, buprenorphine pushes it off and replaces a full effect with a partial one, and your body feels the drop all at once. This is precipitated withdrawal, meaning withdrawal that is set off by the medication itself.
It is not the naloxone. The Suboxone prescribing information says that naloxone has no significant effect when the film dissolves under the tongue. So, the blocker that makes you sick is buprenorphine, doing its job at the wrong moment. So, how long do you have to wait?
How long do you have to wait to take Suboxone?
Long enough to be in withdrawal. The Suboxone prescribing information says that the first dose should be given when objective signs of moderate opioid withdrawal appear, and not less than six hours after the last use of a short-acting opioid.
I am Dr. Leeds, and I have treated opioid dependence for over two decades. In my experience, six hours is rarely enough. For heroin, oxycodone, or hydrocodone, the usual wait is about 18 to 24 hours, and for some people it can be as little as 12.
The clock is a guide, and your body is the real indicator. Runny nose, yawning, tearing eyes, sweating, muscle aches, restlessness, and stomach cramps are early opioid withdrawal symptoms, and when several of them have arrived and you feel mildly to moderately sick, the receptors are mostly empty.
Buprenorphine blocks the opioid receptors, quickly taking away any remaining effect of opioids lingering in your system. While its partial effect is plenty to relieve withdrawal in a person whose receptors are already empty, it cannot make up for a full opioid that it has just pushed off. If you are sick before the dose, you will be comfortable after it. If you are comfortable before the dose, you will be sick after it.
How long does precipitated withdrawal last from Suboxone?
Usually hours, not days. Precipitated withdrawal comes on fast, often within an hour of the dose, with muscle aches, cramping, cold sweats, nausea, diarrhea, and a feeling of dread. The worst of it passes over the next several hours, though after fentanyl it can drag on longer.
While buprenorphine is a long-lasting drug that does not wear off quickly, the symptoms fade as your body adjusts to it, not as it leaves. What you are feeling is your sympathetic nervous system, the “fight or flight” system, firing all at once. It is miserable, and in most cases it is not dangerous, though vomiting and diarrhea can dry you out, so keep drinking fluids.
Fortunately, your doctor can help you through it. There are “comfort meds” for the aches, the nausea, the diarrhea, and the sleeplessness. Clonidine, or Catapres, calms the fight or flight response itself, and its cousin lofexidine, or Lucemyra, was approved by the US Food and Drug Administration, or FDA, in 2018 for opioid withdrawal symptoms. Sleeping through the worst of it is an excellent way to wait it out.
Whatever you do, do not try to fix it with more heroin or fentanyl. The receptors are now held by buprenorphine, so a usual amount does very little, and the temptation to take more and more to break through the block is how people overdose. Your doctor may instead advise another dose of Suboxone, because once buprenorphine holds most of the receptors, more of it can settle things faster rather than slower. Call before you do anything.
Why does fentanyl change the waiting period?
In medicine, we used to teach a simple rule: wait a day, get sick, take the first dose. Fentanyl broke that rule, and it broke it because most street heroin now contains fentanyl, and in many places what is sold as heroin is only fentanyl.
The fentanyl on the street is, in nearly every case, the same molecule as the fentanyl used in hospitals. Analogs such as carfentanil turn up, but they are the minority. The real difference is not the molecule. It is how the drug behaves in a person who uses it every day.
Pharmaceutical fentanyl, given once in a hospital, wears off in hours. Illicit fentanyl, used many times a day for months, lingers, and drug testing shows it. In my experience, and in the urine drug screens of my patients, a person who has used fentanyl daily can keep testing positive for a week or more after the last use, and sometimes considerably longer, while heroin and oxycodone are gone in two to four days.
Why it lingers is not settled. One theory, which I and others have proposed, is that fentanyl dissolves readily in fat, builds up in body fat with daily use, and leaks back out slowly for days. That is a hypothesis, not a proven fact, and the slow clearance itself is what I see and what matters for your first dose.
Withdrawal starts late and feels mild at first, because the drug is still trickling out, so a person feels ready before they are. A patient who waits two full days, takes a standard first dose, and is sicker within the hour than they have ever been is a pattern I have seen many times, and the call that follows is always the same. Suboxone does not work for me.
It did work. It worked too well, too early, on receptors that fentanyl had not yet left. So, precipitated withdrawal can strike three, four, or five days after the last use of fentanyl, and the old 18 to 24 hour rule tells you nothing.
What do I do next after I took Suboxone too early?
First, call your doctor, and do not decide anything about Suboxone while you are still sick. Precipitated withdrawal is a reason to adjust the plan, not a reason to abandon it.
There are two ways to adjust it. One is to wait longer, with comfort meds and a daily check-in, until withdrawal is clearly established, which after fentanyl can mean several more days. The other is to take a much smaller first dose the next time and build it up gradually over several days. This is low-dose induction, sometimes called microdosing, and it is the approach I use most often when treating fentanyl dependence.
Imagine a parking lot where every space is an opioid receptor. Heroin and oxycodone pull in and out of the spaces all day, and they leave when they are done. Buprenorphine pulls in and stays. A standard first dose is a fleet of buprenorphine cars arriving at once, forcing every fentanyl car out of the lot within the hour, and that sudden turnover is what you feel.
A low-dose induction sends a few cars at a time. They take the spaces that fentanyl has already left, the next small dose takes a few more, and over several days the lot changes hands without a scene. While this is not a perfect analogy, it explains why a tiny first dose does not make you sick and a standard one can. Take the small first dose your doctor prescribes, and let the lot change hands slowly.
Interestingly, this is the same principle that makes a hyperbolic taper gentle for patients coming off of other medications that cause physical dependence, only run in reverse. There, the receptors are emptied a few at a time so that the brain never notices a big change, and here they are filled a few at a time, for the same reason. While it is no fun to spend an extra few days on small doses, it is well worth the wait.
Why do so many people give up on Suboxone after a bad start?
Because the medication gets the blame. Was it the Suboxone? Was it the doctor? Or, was it the timing? A person who felt terrible an hour after the first dose concludes that Suboxone is poison for them, and no one can talk them out of it while they are sweating and cramping.
Unfortunately, giving up is the dangerous part. After even a few days without fentanyl, tolerance drops, and the amount that was routine last week can stop your breathing this week. Relapse after a failed start, with tolerance gone, is what kills.
If you do use again, assume that every bag and every pill contains fentanyl, because you cannot tell which ones do, and keep naloxone within reach. In fact, counterfeit pills pressed with fentanyl are sold as oxycodone and other prescription tablets. Naloxone, or Narcan, reverses an opioid overdose. Since 2023, the FDA has allowed the 4 mg Narcan nasal spray to be sold over the counter, without a prescription.
So, the honest message after a bad first dose is not that Suboxone failed you. The timing failed, and timing can be fixed. Tell your doctor exactly what you took, how much, and when, and plan the next attempt together.
Do I need to go to rehab to get through fentanyl withdrawal?
In most cases, no. Residential rehab can be the right choice for a person who wants a structured break from the people and places tied to their drug use, and for some people it is exactly what they need.
Yet, rehab has no special tool for the fentanyl waiting problem. The receptors clear at the same speed in your own bed as they do in a facility, and the low-dose induction that solves the problem can be done at home with a phone. Rehab cannot make fentanyl leave your body any faster. It can only charge you for the wait.
What matters more than the building is the doctor. Buprenorphine induction after fentanyl takes experience, a willingness to go slowly, and a doctor who picks up the phone at nine at night when a patient is frightened and sick. Unfortunately, some of the large online Suboxone programs offer a brief video visit and then no one to call. A patient in precipitated withdrawal with no one to call is a patient who quits.
Of course, the best doctor in the world cannot help a patient who does not report what is happening. Keep the line open. With the right person on the other end, the worst hours of a fentanyl induction are a phone call, not a crisis.
Should I go to the methadone clinic instead?
It is a fair question, and for some people the answer is yes. Methadone is a full opioid agonist, so it can be started right away, with no waiting and no precipitated withdrawal, and that is a real advantage when fentanyl has made the wait long.
There is a price for the convenience. Methadone is a potent, long-acting opioid, so methadone treatment is tightly regulated, and in the early months that means showing up at the clinic every morning for a witnessed dose. Suboxone can be prescribed by the week or the month, and if you work or travel, that freedom matters.
And, the road back is harder. While it is possible to switch from methadone to Suboxone later, the switch takes careful planning because methadone is so potent and lasts so long, and the Suboxone label itself calls for a buprenorphine-only product during that transition. Many patients find it simpler to start on buprenorphine and stay there.
There is nothing wrong with methadone. It saves lives, and a patient who chooses it has chosen a proven treatment. In my opinion, though, if the only thing pushing you toward the clinic line is the fear of a few more days of waiting, a low-dose induction answers that fear with far less disruption to your life.
Suboxone is often the best long-term choice.
If you can get through the first days, the reward is real. Patients describe the mental cloudiness clearing, energy and motivation returning, and the sense of being an earlier version of themselves, from before the drugs. In fact, many say they do not feel as if they are taking anything at all.
That does not mean Suboxone has no side effects. Constipation, sweating, headache, nausea, and trouble sleeping are among the common ones on the Suboxone label, and some patients tell me that their sex drive drops. Most of these ease with time or with a lower dose, and every one of them is worth mentioning to your doctor rather than enduring in silence.
One more thing. The label now warns of cavities, and in some cases tooth fractures and tooth loss, in people taking buprenorphine products that dissolve in the mouth. Once the film has dissolved, take a large sip of water, swish it gently around your teeth and gums, and swallow, and wait an hour before you brush. Then keep up with your dentist.
You will also be physically dependent on buprenorphine, and physical dependence is not addiction. Dependence is what the body does with any opioid taken every day. Addiction is the compulsive use that the medication switches off, and patients on a stable dose describe the absence of addictive thoughts, not their presence.
How long should you stay on it? I do not know of any fixed number, and I am skeptical of anyone who gives you one. Many of my patients stay for a year or more, some for many years, and some taper off of it sooner. The right length is an individual decision that depends on where you are in life and how you are feeling. When you are ready to talk about tapering, your doctor should be ready to listen, and the two of you will set the pace together, as tolerated.
Dr. Leeds treats opioid dependence with buprenorphine films and tablets by telemedicine for new patients throughout Florida, with in-office visits available in Fort Lauderdale. Induction is done at home with phone support, and when fentanyl is involved, a low-dose start is used when needed. A first dose that went wrong, the timing of the next one, and questions about the long-acting injectables can all be worked through in a consultation.
To ask Dr. Leeds about Suboxone treatment or about a first dose that made you feel worse, use the contact form.
If you or someone with you may be overdosing, call 911 right away. If you are in crisis, call or text 988, the Suicide & Crisis Lifeline, at any hour.
This article is educational. It is not medical advice, and reading it does not create a doctor-patient relationship. Decisions about starting, continuing, or tapering any medication should be made with your own physician.
