A muscle relaxant for anaesthesia
Vecuronium
An intermediate-acting muscle relaxant given by an anaesthetist to relax the muscles during surgery.
What is Vecuronium?
Vecuronium is a muscle relaxant given only by an anaesthetist during a general anaesthetic. It temporarily paralyses the muscles, including the breathing muscles, so a breathing tube can be placed and the muscles stay still for surgery. You are always asleep first, and a machine breathes for you throughout. It is an intermediate-acting relaxant, and its effect can be reversed with a medicine such as sugammadex at the end. The anaesthetist monitors the block closely and watches for rare reactions such as severe allergy.
Education and reference only. This is a plain-language guide to Vecuronium — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Vecuronium is a non-depolarising muscle relaxant used during general anaesthesia. It relaxes the muscles so the anaesthetist can place a breathing tube and keep the muscles still during surgery. It is intermediate-acting, meaning its effect lasts a moderate length of time. Like other relaxants in its group, its effect can be reversed at the end. It is given as an injection into a vein by an anaesthetist, only when you are asleep and your breathing is supported by a machine.
How it works
Vecuronium acts at the junction between nerves and muscles, blocking the signal that makes muscles contract so they relax. It does not cause the initial twitching seen with suxamethonium. The block lasts a moderate length of time and is checked with a nerve monitor; at the end of surgery it wears off or is reversed with a medicine. A machine breathes for you the whole time the muscles are relaxed.
Company & origin
Originated / developed by: Generic (long-established).
An intermediate-acting muscle relaxant used in the UK by anaesthetists to keep the muscles relaxed during general anaesthesia.
Practical use
How to take Vecuronium
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- This medicine is given only by an anaesthetist as an injection into a vein, never taken at home.
- You will always be fully asleep under general anaesthetic before it is given.
- A breathing tube is placed and a machine breathes for you while the muscles are relaxed.
- The anaesthetist monitors the block and lets it wear off or reverses it at the end of surgery.
- Tell your anaesthetist beforehand about any previous reaction to anaesthetics or muscle relaxants.
Weighing it up
Advantages & disadvantages of Vecuronium
Advantages
- Provides reliable, intermediate-length muscle relaxation suited to many operations.
- Its effect can be reversed at the end of surgery, including with sugammadex.
- A long-established, well-understood option that anaesthetists know well.
Disadvantages
- Like all muscle relaxants, it can rarely cause a severe allergic reaction.
- It must always be used with a breathing machine and close monitoring by an anaesthetist.
- Its effect can be longer in people with kidney or liver problems, which the anaesthetist allows for.
Practical use
Good to know
You are always fully asleep before vecuronium is given, and a machine breathes for you throughout, so you are never aware of being paralysed. Vecuronium is intermediate-acting, which suits many operations of moderate length. Its effect can be reversed at the end of surgery, including with sugammadex, and the depth of the block is followed with a nerve monitor so recovery can be judged before the breathing tube is removed. The main rare risk is a severe allergic reaction, which the anaesthetic team is trained to manage at once. As with all these medicines, malignant hyperthermia and severe allergy are the key emergencies the team watches for.
Who should not take it / use with caution
- People who have had a severe allergic reaction to vecuronium or similar muscle relaxants should not be given it.
- It is used with care in people with significant kidney or liver problems or certain muscle and nerve conditions.
- Any decision is made by the anaesthetist after reviewing your health and previous anaesthetics.
Monitoring
- Continuous monitoring of breathing, oxygen, heart rate and blood pressure throughout.
- A nerve monitor is used to check the depth and recovery of muscle relaxation.
- The team watches closely for any sign of a severe allergic reaction.
Side effects
- Most effects are part of the intended muscle relaxation, managed by the anaesthetist.
- A temporary change in heart rate or blood pressure in some people.
- Rarely, a severe allergic reaction, which the team is trained to treat immediately.
Key interactions
- Some antibiotics and other anaesthetic drugs can lengthen or change its effect.
- Sugammadex can be used to reverse it, switching off the block quickly.
- The anaesthetist manages all interactions directly in the operating theatre.
Available as: Injection into a vein, given only by an anaesthetist in hospital.
Answers
Vecuronium: frequently asked questions
Will I be aware while my muscles are relaxed?
No. You are always fully asleep under general anaesthetic before vecuronium is given, and a machine breathes for you, so you are not aware of being paralysed.
How long does vecuronium last?
It is intermediate-acting, lasting a moderate length of time, which suits many operations; the anaesthetist tops it up or lets it wear off as needed.
How is it reversed?
At the end of surgery the block wears off or is switched off with a reversal medicine such as sugammadex, and recovery is checked before the breathing tube is removed.
Does kidney or liver disease matter?
Its effect can last longer if the kidneys or liver are not working well, so the anaesthetist takes this into account and monitors the block closely.
Is it safe?
It is widely used and well understood; the main rare risk is a severe allergic reaction, which the anaesthetic team is trained to recognise and treat immediately.
Authoritative sources
- BNF
- NICE CKS
Building a medicines information resource?
We create evidence-led, dose-free drug and formulary references for teams.