Relistor Injection: Uses, Dosage, and Side Effects
Quick summary: Relistor injection contains methylnaltrexone bromide and is used for opioid-induced constipation when standard laxatives have not provided enough relief. It is given by subcutaneous injection and should be used exactly as directed...
This content is for educational purposes only and does not replace medical advice, diagnosis or treatment from a qualified healthcare professional.
Quick summary: Relistor injection contains methylnaltrexone bromide and is used for opioid-induced constipation when standard laxatives have not provided enough relief. It is given by subcutaneous injection and should be used exactly as directed by a healthcare professional.
Key points: uses, weight-based dosing guidance, common side effects, precautions, and FAQs are covered below.
Medical disclaimer: This article is for general information only and does not replace advice from a doctor, nurse, or pharmacist. Always check the official patient leaflet and your prescriber’s instructions for the most accurate guidance for your situation.
What is Relistor injection?
Relistor injection is a medicine containing methylnaltrexone bromide. It is a mu-opioid receptor antagonist, which means it helps block the constipating effects of opioid medicines in the gut.
It is used when opioid-induced constipation has not been adequately relieved by traditional laxatives. Relistor is available as an injection, and the choice of formulation and schedule should be guided by a healthcare professional.
What is Relistor injection used for?
The main use of Relistor injection is to treat opioid-induced constipation (OIC). This may be relevant for people taking opioids for chronic pain or for advanced illness.
- Opioid-induced constipation
- Constipation that has not responded well to conventional laxatives
- Situations where maintaining opioid pain relief is important
Relistor acts in the gastrointestinal tract, helping bowel function without changing the pain-relieving effect of the opioid itself.
How is Relistor injection usually dosed?
The dose of Relistor injection depends on the person’s weight and clinical situation. The original content notes the following general guidance:
| Weight group | General dose mentioned in the source | Route |
|---|---|---|
| Under 100 kg | 8 mg | Subcutaneous injection |
| Over 100 kg | 12 mg | Subcutaneous injection |
Injection sites should be rotated to help reduce discomfort and skin irritation. Do not change the dose or schedule unless a healthcare professional tells you to do so.
The source also notes that laxatives should not be used before starting Relistor if the goal is to assess how well it works. If you are unsure what that means for your treatment plan, confirm it with your prescriber or pharmacist.
How is Relistor injection given?
Relistor injection is given under the skin (subcutaneously). Before use, the solution should be checked to make sure it is clear and free from visible particles.
- Use only as instructed by a healthcare professional
- Rotate injection sites
- Follow the administration steps provided with the medicine
If you are not confident about injection technique, ask a healthcare professional to show you how to use it safely.
What are the common side effects of Relistor injection?
The original content lists the following common side effects:
- Abdominal pain
- Flatulence
- Nausea
These effects are often described as mild, but any side effect that is severe, persistent, or worrying should be discussed with a healthcare professional.
What precautions should be taken?
Before using Relistor injection, it is important to tell your healthcare provider about your medical history and all current medicines. The original content highlights the following precautions:
- Tell your clinician about all medicines you are taking
- Report any history of gastrointestinal obstruction
- Let your clinician know about significant medical problems
- Older adults may need closer monitoring
People with significant renal or hepatic impairment may need extra caution, so this should be reviewed by a healthcare professional.
When should Relistor injection be avoided or used with caution?
The source states that Relistor injection is contraindicated in some situations, including known hypersensitivity to methylnaltrexone or any component of the formulation. It also notes caution in people with diarrhea or severe abdominal pain.
Because suitability can depend on the full clinical picture, a doctor or pharmacist should review the medicine before use if there are any concerns about bowel symptoms, kidney or liver problems, or other ongoing conditions.
What should you verify with a doctor or pharmacist?
If you have been prescribed Relistor injection, it is sensible to confirm the following with a healthcare professional or the official leaflet:
- Your exact dose and injection schedule
- How to prepare and give the injection correctly
- Whether your current laxatives should be continued or reviewed
- What side effects need urgent medical attention
- Whether your other medicines could affect treatment
Frequently asked questions
▸ What is Relistor injection used for?
Relistor injection is used to treat opioid-induced constipation, especially when traditional laxatives have not worked well enough.
▸ How is Relistor injection given?
It is given as a subcutaneous injection. A healthcare professional should provide the correct instructions for use.
▸ What are the common side effects?
The common side effects listed in the source are abdominal pain, flatulence, and nausea.
▸ Does the dose depend on body weight?
Yes. The source notes a general dose of 8 mg for people under 100 kg and 12 mg for people over 100 kg, but the exact plan should be confirmed by a prescriber.
▸ Should I check anything before using it?
Yes. Check your medical history, current medicines, and the official leaflet, and ask a healthcare professional if you have any bowel, kidney, or liver concerns.
Safety reminder: Seek urgent medical advice if you develop severe or persistent abdominal pain, significant diarrhea, or any reaction that feels unusual or serious. Always follow the instructions given by your healthcare professional and the medicine leaflet.
Medical disclaimer
This content is for educational purposes only. It should not be used as a substitute for professional medical advice, diagnosis or treatment. Always ask a doctor, pharmacist or qualified healthcare professional before starting, stopping or changing any medicine.
Sources and verification
The following sources or official references are listed to support verification of the medicine information discussed in this article.
Medicine information can change and may vary depending on country, product formulation, patient history and professional guidance. Always check official medicine information and ask a healthcare professional for personal medical questions.