Naltrexone

Basic naltrexone information

• INN (international nonproprietary name): Naltrexone
• Brand names available in the United Kingdom: Naltrexone Accord
• ATC code: N07BB04
• Forms and dosages: Tablets (50 mg)
• Manufacturers in the United Kingdom: Accord Healthcare
• Registration status in the United Kingdom: Prescription-only medicine (POM)
• OTC / Rx classification: Prescription-only medicine (POM)

Everyday use and best practices

Morning vs evening dosing

General advice suggests taking naltrexone once daily to maintain consistent levels in the body. Opting for morning or evening dosing can depend on individual routines and potential side effects. Morning doses may be preferable to avoid possible insomnia, while evening doses might suit those who experience daytime sedation. Always consider personal schedules and any side effects manifesting from different dosing times.

Taking with or without meals (UK diet habits)

Naltrexone can be taken with or without meals; taking it with food may reduce nausea. To seamlessly integrate naltrexone into a typical UK diet:

• Consider meal timing—try to take naltrexone around the same time daily with your preferred meal.

Safety priorities

Who should avoid it (MHRA warnings)

Populations that should be cautious or outright avoid this medication include:

• Individuals currently dependent on opioids or undergoing withdrawal.
• People with acute hepatitis or liver failure.
• Those with known hypersensitivity to naltrexone or any of its excipients.

Activities to limit (driving, work safety)

Naltrexone may cause drowsiness or dizziness, which can affect reflexes and judgement. Therefore, it is advisable to limit activities such as:

• Driving motor vehicles.
• Operating heavy machinery.

Dosage and adjustments

General regimen (NHS guidance)

Standard dosage for adults, as per NHS guidelines, varies depending on the condition: For opioid dependence, an initial dose of 25 mg may be followed by 50 mg daily. For alcohol dependence (an off-label use in the UK), 50 mg each day is common. Following dosing guidelines is crucial, as proper adherence supports successful outcomes in managing dependence issues and reduces relapse potential.

Special cases (elderly, comorbidities)

Adjustments for patients with comorbidities are essential. Older adults or those with existing health conditions might require tailored doses. For elderly patients:

• Monitor closely without general dose adjustments unless hepatic or renal concerns exist.
• Ensure that any potential drug interactions with comorbidities are managed effectively.

What’s inside and how it works

Ingredients overview

The primary active ingredient in naltrexone is, unsurprisingly, naltrexone hydrochloride. Inactives may include various fillers or stabilisers used in tablet formulations. Understanding these ingredients helps in discussing potential allergies or sensitivities with healthcare providers.

Mechanism basics explained simply

Naltrexone functions as an opioid antagonist. This essentially means it blocks opioid receptors in the brain, reducing the pleasurable effects of opioids and eventually decreasing cravings for alcohol. Think of it as a bouncer preventing unwanted guests from disrupting the party; it keeps cravings at bay.

Main indications

Approved uses (MHRA listing)

Naltrexone is licensed in the UK as an adjunct to prevent relapse in people who have been detoxified from opioid dependence. Patients must not be currently physiologically dependent on opioids and should show a readiness to adhere to their treatment plan.

Off-label uses in UK clinics

Beyond its approved indications, naltrexone is used in UK clinics for alcohol dependence, reducing cravings and consumption. Low-dose naltrexone is also sometimes tried for chronic pain, fibromyalgia and autoimmune disorders, although the evidence for these applications is limited.

Interaction warnings

Food interactions (alcohol, tea/coffee)

Naltrexone can interact negatively with specific foods, notably alcohol. Patients treated for opioid dependence should be cautious with alcohol, and those treated for alcohol dependence should follow their prescriber's advice on abstinence or reduced drinking. Caffeine-containing beverages like tea and coffee may aggravate side effects such as insomnia or anxiety. For optimal results, a balanced diet with minimal alcohol and caffeine intake is advisable.

Drug conflicts

Drug interactions can pose significant risks with naltrexone. Naltrexone blocks the effect of opioid medicines, including opioid painkillers, buprenorphine and methadone, and can trigger withdrawal in people who are opioid-dependent. Doctors should monitor these interactions closely to prevent complications when prescribing naltrexone.

Alternative choices

Patients seeking alternatives to naltrexone for alcohol and opioid dependence can consider medications such as acamprosate and buprenorphine. Each comes with its pros and cons:

• Acamprosate: Used for alcohol dependence, as part of a programme of psychosocial support after detoxification.
• Buprenorphine: Effective for opioid dependence, requires careful prescribing; risk of addiction if misused.

Ultimately, the choice of medication should align with individual patient needs, taking into account potential benefits and side effects.

Regulation snapshot

Naltrexone is classified as a prescription-only medicine (POM) in the UK. It is available as Naltrexone Accord. It is licensed for relapse prevention in opioid dependence, and is also used off-label for alcohol dependence.

The roles of the Medicines and Healthcare products Regulatory Agency (MHRA) and the National Health Service (NHS) are pivotal. While the MHRA oversees the safety, effectiveness, and quality of medicines, the NHS is responsible for prescribing and ensuring accessibility. Healthcare professionals within the NHS prescribe naltrexone based on individual patient assessments, guiding treatment plans that often incorporate supportive therapies alongside medication.

Frequently asked questions

Many patients have similar concerns when considering naltrexone therapy. Here are some frequently asked questions:

• Can I buy naltrexone over the counter? No, naltrexone is a prescription-only medicine in the UK. It is important to consult a healthcare provider for proper guidance.
• How long does it take for naltrexone to work? Patients may start experiencing the effects within a few days, but the optimal impact usually occurs after several weeks of consistent use.
• What should I avoid while taking naltrexone? Alcohol and opioid medications should be strictly avoided, as they can trigger withdrawal or adverse effects.
• Are there long-term side effects of naltrexone? Some patients may experience side effects such as nausea or headaches, but most side effects tend to diminish over time. Regular consultations with a healthcare professional are advised.

Guidelines for proper use

UK pharmacist counselling style

Pharmacists play a vital role in patient education about naltrexone. They often provide information on how to take the medication, emphasising proper dosing and adherence to the prescribed schedule. The common advice includes:

• Taking naltrexone consistently at the same time each day.
• Avoiding alcohol and opioids during treatment.
• Monitoring for any side effects and reporting them to healthcare providers.

NHS patient support advice

The NHS offers various resources for those prescribed naltrexone. Patients can access support services through local clinics, helplines, and educational materials aimed at fostering understanding and promoting recovery. Key resources include:

• The NHS website provides comprehensive details on naltrexone and its uses.
• Local addiction services offer counselling and group support.
• Helplines are available for immediate assistance and advice.

For further support:

• Visit the NHS website: NHS UK.
• Contact local services for tailored support options.

Delivery information