Buy Naltrexone without prescription

Naltrexone is an FDA‑approved medication used to support recovery from alcohol use disorder (AUD) and opioid use disorder (OUD). As an opioid receptor antagonist, it blocks the euphoric and sedative effects of opioids and reduces alcohol cravings, helping prevent relapse when combined with counseling and support. Available as a once‑daily tablet and a once‑monthly extended‑release injection (brand name Vivitrol), naltrexone is non‑addictive and does not cause physical dependence. Safe use requires being opioid‑free before starting, routine monitoring for liver health, and a personalized plan for pain control. Talk with a clinician to see whether naltrexone fits your goals and needs.

Naltrexone in online store of HealthSouth Rehabilitation Hospital of Tallahassee

 

 

Common uses of Naltrexone for AUD and OUD

Naltrexone is a cornerstone medication for two major conditions: alcohol use disorder (AUD) and opioid use disorder (OUD). For AUD, it helps reduce heavy drinking days and lowers the risk of relapse by dampening alcohol’s rewarding effects. For OUD, it blocks the euphoric and sedative effects of opioids, making a return to nonmedical use less reinforcing. It is most effective when combined with counseling, peer support, and recovery services as part of medication‑assisted or medication‑for‑addiction treatment (MAT/MOUD).

Two formulations are available in the United States: oral tablets (usually taken daily) and a once‑monthly extended‑release intramuscular injection, often known by the brand Vivitrol. The extended‑release option can be helpful for people who prefer not to take a daily pill or who want consistent medication coverage between clinic visits. Both forms are non‑addictive and do not produce tolerance or withdrawal when stopped.

Naltrexone is also used off‑label in certain research settings (for example, low‑dose naltrexone for chronic pain or inflammatory conditions), but those uses remain investigational. Anyone considering off‑label therapy should do so under the guidance of a clinician who can weigh potential benefits against risks and monitor for side effects.

 

 

Naltrexone dosage and directions

Typical oral dosing for AUD or OUD relapse prevention is 50 mg once daily, though some clinicians may use alternative schedules (for example, 100 mg on certain days) to support adherence. The extended‑release formulation is administered as a 380 mg intramuscular injection into the gluteal muscle once every four weeks by a healthcare professional. Dosing and schedule are individualized based on clinical response, tolerability, and treatment goals.

Before starting naltrexone, you must be opioid‑free to avoid precipitated withdrawal. This typically means at least 7–10 days since last use of short‑acting opioids; people coming off methadone or buprenorphine may need a longer washout window. Many clinicians will perform a urine drug screen and may consider a supervised naloxone or naltrexone challenge to confirm opioid‑free status. Starting any sooner can trigger severe, sudden withdrawal symptoms.

Never initiate naltrexone on your own if there is any chance opioids remain in your system. Your care team can help determine readiness, set up baseline labs (including liver function tests), and create a treatment plan that integrates counseling, recovery supports, and practical strategies to manage triggers and cravings. If you receive the monthly injection, schedule follow‑ups ahead of time so coverage does not lapse.

 

 

Precautions before and during Naltrexone therapy

Liver health matters. Naltrexone can raise liver enzymes and, rarely, cause clinically significant liver injury at higher doses. Your clinician will typically obtain baseline liver function tests and monitor periodically. Tell your care team about any history of hepatitis, cirrhosis, or heavy alcohol use, and report symptoms such as abdominal pain, dark urine, unusual fatigue, or yellowing of the skin or eyes.

Because naltrexone blocks opioid receptors, opioid pain medicines will be less effective. You should carry medical ID or a wallet card stating you take naltrexone. In an emergency, clinicians can choose non‑opioid pain strategies or—if opioids are absolutely necessary—manage pain in a monitored setting. After stopping naltrexone, your opioid tolerance may be reduced, increasing overdose risk if you return to prior doses. Discuss an overdose prevention plan and consider keeping naloxone on hand.

Special populations require individualized assessment. For pregnancy and breastfeeding, data are limited; risk–benefit discussions should include alternative treatments. Those with kidney impairment, older adults, and people taking multiple medicines should be monitored closely. Do not use naltrexone if you are currently using opioids or in active withdrawal.

 

 

Contraindications to Naltrexone

Naltrexone is contraindicated for anyone currently using opioids, in acute opioid withdrawal, or with a positive opioid screen. It should not be taken by individuals with a known hypersensitivity to naltrexone or any component of the formulation. Severe, acute hepatitis or liver failure is also a contraindication. When in doubt, consult a clinician who can assess risks and timing.

 

 

Possible side effects of Naltrexone

Most people tolerate naltrexone well. Common side effects with oral tablets include nausea, headache, dizziness, fatigue, insomnia, anxiety, and abdominal discomfort. These symptoms often improve after the first couple of weeks. Taking the tablet with food and staying hydrated can sometimes help with nausea.

With the extended‑release injection, injection‑site reactions are the most frequent complaint: pain, firmness, swelling, itching, or bruising where the shot is given. Rarely, more serious reactions such as injection‑site abscess or tissue damage can occur; report any severe pain, warmth, drainage, or skin changes promptly. General side effects such as nausea, fatigue, and headache may also occur after injections and tend to diminish over time.

Less common but important risks include elevated liver enzymes, allergic reactions (rash, hives, swelling), and mood changes. While many patients experience improved mood with recovery, some report depressed mood or irritability. Seek urgent help for signs of liver problems, severe allergic reactions, or suicidal thoughts. Your clinician can adjust the plan, change the dose, or switch medications if needed.

 

 

Drug interactions with Naltrexone

The most clinically significant interaction is with opioids. Naltrexone blocks prescription opioid analgesics (for example, oxycodone, hydrocodone, morphine), some opioid‑containing cough syrups, and illicit opioids such as heroin or fentanyl. Attempts to “override” the blockade by taking large opioid doses can lead to life‑threatening overdose—especially as the medication wears off or after a missed dose. Always inform all of your clinicians and pharmacists that you use naltrexone.

Because naltrexone is processed by the liver, combining it with other hepatotoxic substances (for example, high‑dose acetaminophen, isoniazid, certain antifungals) may increase liver risk. Alcohol itself can stress the liver. Some clinicians avoid using naltrexone alongside disulfiram because of additive hepatic concerns. There are generally no strong interactions with SSRIs, SNRIs, bupropion, or antipsychotics, but your full medication list should be reviewed to minimize risks and side effects.

 

 

Missed dose guidance

If you miss an oral dose, take it when you remember unless it’s close to the next scheduled dose; do not double up. If you miss or delay a monthly injection, contact your clinic as soon as possible to reschedule—consistent coverage supports relapse prevention. Keep your next appointment on the calendar and use reminders to stay on track.

 

 

Overdose and safety considerations

Naltrexone itself is not commonly associated with life‑threatening overdose at therapeutic doses, but two overdose scenarios are critical: taking large amounts of opioids to overcome receptor blockade, and returning to prior opioid doses after stopping naltrexone when tolerance is reduced. Both can be fatal. If an opioid overdose is suspected, call 911 immediately and administer naloxone if available. Naltrexone does not treat opioid overdose; naloxone is the emergency antidote. For suspected medication overdose or poisoning, contact your local poison control center for guidance.

 

 

Storage instructions

Store oral naltrexone tablets at room temperature away from moisture and heat, in their original child‑resistant container, and out of reach of children and pets. The extended‑release injection is stored and administered by healthcare professionals under appropriate conditions; patients do not typically store it at home. Never use expired medication, and dispose of unused tablets according to pharmacy or community take‑back guidance.

 

 

U.S. sale and prescription policy for Naltrexone

In the United States, naltrexone is a prescription‑only medication. It is not legal—or safe—to buy naltrexone without a prescription online or in person. Any website or seller offering “no‑prescription” naltrexone is operating outside U.S. law and may supply counterfeit or unsafe products. To stay protected, obtain naltrexone through a licensed clinician and a state‑licensed pharmacy or a clinic that administers the monthly injection.

The good news: access pathways are flexible. Any appropriately licensed clinician (physician, nurse practitioner, or physician assistant, depending on state law) can evaluate you and prescribe naltrexone; no special waiver is required. Telehealth visits are often available, and many insurers—including Medicaid and commercial plans—cover naltrexone. Manufacturer assistance and 340B clinics may reduce out‑of‑pocket costs for eligible patients. The SAMHSA national helpline can help you locate local treatment providers.

In Tallahassee, HealthSouth Rehabilitation Hospital of Tallahassee can help you pursue a legal, structured path to treatment—through professional evaluation, care planning, and, when appropriate, prescribing and administering FDA‑approved medications such as naltrexone. They do not dispense prescription medications without a valid prescription; instead, their clinicians guide you through evidence‑based options, coordinate pharmacy or in‑clinic injection services, and connect you with counseling and recovery resources. Choosing a licensed provider protects your health, ensures you receive authentic medication, and keeps your recovery plan safe and compliant with U.S. law.

Naltrexone FAQ

What is naltrexone and how does it work?

Naltrexone is an opioid receptor antagonist that blocks mu-opioid receptors in the brain. By dampening the reward response from alcohol and blocking the effects of opioids, it helps reduce cravings and the likelihood of relapse in alcohol use disorder and supports relapse prevention in opioid use disorder after detoxification.

What conditions is naltrexone used to treat?

Naltrexone is FDA-approved for alcohol use disorder to reduce heavy drinking and support abstinence, and for opioid use disorder as relapse prevention after complete detox. It is also part of the bupropion/naltrexone combination for chronic weight management, and low-dose naltrexone is used off-label for certain pain and inflammatory conditions.

Is naltrexone addictive or a controlled substance?

Naltrexone is not an opioid, does not cause euphoria, and is not habit-forming. It is not a controlled substance and does not produce physical dependence.

Who is a good candidate for naltrexone?

Adults with alcohol use disorder who want to cut down or stop drinking and people with opioid use disorder who have completed detox and are fully opioid-free may benefit. It’s best for those who can avoid opioids for pain control and who can participate in counseling or support programs alongside medication.

Who should not take naltrexone?

Avoid naltrexone if you are currently using opioids, are in acute opioid withdrawal, need opioid pain medicines, have acute hepatitis or liver failure, or have a known allergy to it. A careful risk–benefit discussion is needed in pregnancy, severe liver disease, and for those on hepatotoxic medications.

Do I need to be opioid-free before starting naltrexone?

Yes. To prevent precipitated withdrawal, you must be opioid-free for at least 7–10 days after short-acting opioids and often 10–14 days after long-acting opioids or methadone/buprenorphine. Some clinicians use a naloxone or naltrexone challenge to confirm readiness.

Can I drink alcohol while taking naltrexone?

Naltrexone does not cause an aversive reaction with alcohol, but it often reduces the urge to drink and the amount consumed. Many treatment plans pair naltrexone with counseling to support cutting down or abstaining safely.

What are common side effects of naltrexone?

Nausea, headache, dizziness, fatigue, anxiety, and sleep changes are the most common and often improve over days to weeks. Less commonly, it can elevate liver enzymes or, with the injection, cause injection-site pain or reactions; severe liver injury is rare at standard doses but warrants monitoring.

How is naltrexone taken—oral tablet or injection?

Oral naltrexone is typically 50 mg once daily, sometimes started at 25 mg to reduce nausea. Extended-release naltrexone (Vivitrol) is a 380 mg intramuscular injection given once monthly, which helps with adherence and provides steady receptor blockade.

How long should I stay on naltrexone?

Duration is individualized. Many people use it for 3–6 months or longer, and continuing through periods of high relapse risk is common; some remain on it for a year or more. Ongoing review with your clinician helps decide when and how to discontinue.

What should I do if I miss a dose of oral naltrexone?

Take it when you remember unless it’s close to the next dose; do not double up. If you miss an injection appointment, reschedule as soon as possible to maintain coverage.

Is naltrexone safe for the liver?

At standard doses for alcohol use disorder, naltrexone is generally safe, but baseline and periodic liver function tests are recommended. It should be avoided in acute hepatitis or liver failure and used cautiously with monitoring in stable chronic liver disease.

Can I take naltrexone with antidepressants or anti-anxiety medications?

Naltrexone does not have significant pharmacokinetic interactions with SSRIs, SNRIs, or most anxiolytics, and they are commonly used together. Your clinician will review your full medication list to avoid additive side effects or rare interactions.

What if I need pain control or surgery while on naltrexone?

Opioid pain medicines will be blocked and may be ineffective. For elective procedures, oral naltrexone is typically stopped 2–3 days before surgery; the injection requires a longer washout (about a month). Non-opioid analgesics and regional anesthesia techniques are preferred when possible; plan ahead with your surgical and addiction teams.

What is low-dose naltrexone (LDN) and is it effective?

LDN refers to doses around 1.5–4.5 mg daily, used off-label for conditions like fibromyalgia, neuropathic pain, and some autoimmune disorders. Early studies and patient reports are promising but mixed; evidence is not definitive, so it should be considered experimental and supervised by a clinician.

Does naltrexone help with weight loss?

Naltrexone alone is not a weight-loss drug, but the combination of bupropion/naltrexone (Contrave) is FDA-approved for chronic weight management alongside diet and exercise. It helps curb appetite and cravings; it is not for people with uncontrolled hypertension, seizure disorders, or chronic opioid use.

Can naltrexone be used during pregnancy or breastfeeding?

Data in pregnancy are limited; for opioid use disorder, methadone or buprenorphine is usually preferred. For alcohol use disorder, decisions are individualized; discuss risks and benefits. Small amounts may pass into breast milk; careful monitoring and shared decision-making are essential.

Will naltrexone show up on a drug test?

Standard workplace drug tests do not screen for naltrexone, and it does not cause a false-positive for opioids. Always disclose prescribed medications to the testing entity if needed.

Can I use cannabis or kratom while on naltrexone?

Cannabis does not act on opioid receptors, but combining substances can undermine recovery and add risks. Kratom has opioid-like activity; naltrexone can precipitate withdrawal in kratom users—avoid kratom and discuss any use with your clinician.

How quickly does naltrexone start to reduce cravings?

Many people notice reduced alcohol cravings within the first week; full benefit may take several weeks with ongoing counseling. For opioid blockade, effects begin within hours of dosing and last about 24 hours for a standard oral dose and about a month with the injection.

How does naltrexone compare to acamprosate for alcohol use disorder?

Naltrexone tends to reduce heavy drinking days and cravings, making it useful for people who still encounter alcohol cues. Acamprosate is better studied for maintaining abstinence once achieved, is renally cleared (safer in liver disease), and requires three-times-daily dosing; the better choice depends on goals, liver/kidney function, and adherence.

How does naltrexone compare to disulfiram (Antabuse) for alcohol use disorder?

Naltrexone lowers reward and cravings without causing sickness if alcohol is consumed. Disulfiram is an aversive agent that makes you ill if you drink; it demands strict abstinence and high motivation, and carries more interaction risks and potential liver toxicity. Many clinicians prefer naltrexone or acamprosate as first-line options.

Naltrexone vs nalmefene: what’s the difference?

Both are opioid antagonists. Naltrexone is widely used as a daily oral or monthly injection; nalmefene is approved in some regions (e.g., Europe) for as-needed dosing before anticipated drinking. Choice may hinge on availability, cost, and whether a daily or targeted approach fits the patient.

Naltrexone vs topiramate for alcohol reduction

Topiramate is off-label for alcohol use disorder and can reduce drinking, but it often causes paresthesias, cognitive slowing, and weight loss; it must be slowly titrated. Naltrexone is on-label, usually better tolerated, and simpler to start; either can be paired with counseling, and individual response varies.

Naltrexone vs gabapentin for alcohol use disorder

Gabapentin is off-label and may help with sleep, anxiety, and reducing drinking, particularly early in recovery, but can cause sedation and has some misuse potential. Naltrexone directly targets alcohol reward pathways and has stronger evidence for reducing heavy drinking. Sometimes they are used together under supervision.

Naltrexone vs baclofen for alcohol dependence

Baclofen is off-label and may be considered in people with significant liver disease because it is primarily renally cleared; evidence for efficacy is mixed and sedation is common. Naltrexone has more robust evidence for reducing heavy drinking, but requires liver monitoring.

Naltrexone vs buprenorphine for opioid use disorder

Buprenorphine is a partial opioid agonist that controls withdrawal and cravings and has the best retention for many patients. Naltrexone is an antagonist that requires full detox before starting and works by blocking opioids; it suits those who prefer a non-opioid option or cannot access agonist therapy, but retention may be lower.

Naltrexone vs methadone for opioid use disorder

Methadone is a full opioid agonist with strong evidence for reducing mortality and illicit opioid use, but it requires daily observed dosing initially and can cause QT prolongation. Naltrexone avoids opioid agonist effects and diversion risk but demands complete detox and careful pain planning; matching to patient preference and setting is key.

Naltrexone vs naloxone: when is each used?

Naloxone is a short-acting antagonist used to reverse opioid overdoses within minutes and is carried as a rescue medication. Naltrexone is longer-acting and used for maintenance treatment in alcohol and opioid use disorders; it is not a substitute for naloxone in emergencies.

Oral naltrexone vs extended-release naltrexone injection (Vivitrol)

Oral tablets allow flexible dosing but rely on daily adherence and can be stopped abruptly. The monthly injection improves adherence and creates a consistent blockade that’s harder to override, but requires clinic visits, has injection-site risks, and a long washout if adverse effects occur.

Vivitrol vs Sublocade: which monthly shot is right for opioid use disorder?

Vivitrol (naltrexone) is an antagonist requiring full detox; it blocks opioids and is suitable for those avoiding agonists. Sublocade (extended-release buprenorphine) is a partial agonist that reduces withdrawal and cravings without requiring full detox first; it generally has higher retention but includes opioid exposure.

Standard-dose naltrexone vs low-dose naltrexone (LDN)

Standard-dose naltrexone (typically 50 mg oral daily or 380 mg monthly injection) is for alcohol and opioid use disorders. LDN uses much smaller doses for off-label pain or inflammatory conditions; it is not a treatment for alcohol or opioid use disorders and should not be used to block opioids.

Naltrexone vs bupropion/naltrexone (Contrave) for weight management

Naltrexone alone is not indicated for weight loss. The combination with bupropion targets appetite and reward circuits for chronic weight management; it involves a specific titration schedule and has contraindications such as seizure disorders and chronic opioid use.

Naltrexone vs acamprosate in patients with liver disease

Naltrexone can elevate liver enzymes and is avoided in acute hepatitis, though it can be used cautiously in stable disease. Acamprosate is renally cleared and preferred when significant liver impairment is present, provided kidney function is adequate.

Naltrexone vs disulfiram for people who cannot attend frequent monitoring

Naltrexone generally needs less intensive monitoring than disulfiram, which works best with supervised dosing due to adherence and safety concerns. For many, naltrexone is easier to maintain, while disulfiram may suit highly motivated, supervised settings.