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Long-Acting Local Anaesthetic (Amide) Pregnancy: No or limited data in pregnant women; animal studies show reproductive toxicity. EXPAREL liposomal is not recommended during pregnancy or in women of childbearing potential not using contraception. Bupivacaine and its metabolite are present in human milk at low levels; decide whether to discontinue breast-feeding or the medicinal product.

Bupivacaine

Brand names: Marcain, Marcain Heavy (spinal)

Bupivacaine is a long-acting amide local anaesthetic used for infiltration, peripheral nerve blocks, and epidural and spinal anaesthesia in surgery and for postoperative and obstetric analgesia.

Auto-extracted from the source labelling — not yet independently clinician-verified. These values were distilled from the UK SPC (or the US label where noted) but have not had a clinician sign-off. Confirm against the current SmPC before prescribing.

Adult dose

Dose: Liposomal bupivacaine (EXPAREL) for surgical post-operative analgesia: dose individualised to surgical site size and volume required; e.g. field block 106 mg (8 mL) for bunionectomy or up to 266 mg (20 mL) for haemorrhoidectomy; peripheral nerve block 133-266 mg (10-20 mL)
Route: Surgical-site infiltration (field block) or perineural (peripheral nerve block); single-dose only
Frequency: Single dose
Max: 266 mg (20 mL undiluted) must not be exceeded
Surgical-context view of the EXPAREL liposomal bupivacaine UK SPC (single-dose post-operative pain management), for adults and children aged 6 years or older; dose based on surgical site size, volume required to cover the area and individual patient factors. Field block examples: bunionectomy total 106 mg (8 mL, with 7 mL around the osteotomy and 1 mL subcutaneous); haemorrhoidectomy total 266 mg (20 mL) diluted with 10 mL saline to 30 mL, in six 5 mL aliquots. Peripheral nerve block examples: femoral nerve block for total knee arthroplasty 266 mg (20 mL); brachial plexus block for total shoulder arthroplasty or rotator cuff repair 133 mg (10 mL) diluted to 20 mL. Efficacy and safety not established in major abdominal, vascular and thoracic surgery. May be given 'as is' or expanded with 0.9% saline to 0.89 mg/mL (1:14 by volume). Administer with a 25 gauge or larger needle; inject slowly (1-2 mL per injection) with frequent aspiration. Liposomal preparation — NOT interchangeable with other bupivacaine formulations; if admixed with bupivacaine HCl the total must not exceed 400 mg equivalents of bupivacaine HCl in adults and the HCl:liposomal ratio must not exceed 1:2. Administer only where trained personnel and resuscitation equipment are available. Elderly: no dose adjustment required. Hepatic impairment: no adjustment in mild/moderate; insufficient data in severe.

Paediatric dose

Dose: 4 mg/kg
Route: Field block (surgical-site infiltration), single dose
Frequency: Single dose
Max: Not to exceed 266 mg
Liposomal bupivacaine (EXPAREL) in paediatric patients aged 6 years and older, as a single-dose field block for somatic post-operative pain from small- to medium-sized surgical wounds. Not established as a field block in children 1 to <6 years, nor as a nerve block in children 1 to <18 years. Must not be used in children under 1 year. Verify dose against a children's formulary.

Dose adjustments

Renal

Bupivacaine or its metabolites are substantially excreted by the kidney; risk of toxic reactions may be greater in renal impairment. Impaired renal function should be considered when selecting the dose.

Dose auto-extracted from UK Summary of Product Characteristics (SPC) via the eMC; US FDA prescribing information (openFDA / DailyMed) — cross-check; US labelling may differ from UK — not yet clinician-verified. Always confirm against the product SmPC and your local formulary before prescribing.

Paediatric weight-based calculator

Liposomal bupivacaine (EXPAREL) in paediatric patients aged 6 years and older, as a single-dose field block for somatic post-operative pain from small- to medium-sized surgical wounds. Not established as a field block in children 1 to <6 years, nor as a nerve block in children 1 to <18 years. Must not be used in children under 1 year. Verify dose against a children's formulary.

Verify in a children's formulary

Contraindications

  • Hypersensitivity to the active substance or any excipient
  • Hypersensitivity to amide-type local anaesthetics
  • Obstetrical paracervical block anaesthesia (risk of foetal bradycardia or death)
  • Intravascular administration
  • Intra-articular administration

Side effects

  • Hypoaesthesia oral (>=5%)
  • Dysgeusia (common)
  • Vomiting, constipation, nausea (common)
  • Systemic toxic reactions — serious dysrhythmia, serious hypotension, and (rarely) convulsions or cardiac arrest
  • Dizziness, somnolence, headache, hypoaesthesia (uncommon)

Interactions

  • Other local anaesthetics — toxic effects are additive; co-administer with caution and monitor for local anaesthetic systemic toxicity (LAST)
  • Bupivacaine HCl (immediate-release) — if admixed, HCl:liposomal ratio must not exceed 1:2 and total must not exceed 400 mg bupivacaine HCl equivalents in adults; redosing/overdose may increase risk of LAST

Clinical monograph

How it works

It reversibly blocks voltage-gated sodium channels in nerve membranes, preventing the initiation and conduction of nerve impulses.

Prescribing in practice

  • Inadvertent intravascular injection or excessive dosing can cause severe, potentially fatal cardiotoxicity and central nervous system toxicity, so careful aspiration, incremental dosing, and resuscitation facilities including lipid emulsion are essential.
  • It is more cardiotoxic than other local anaesthetics, and the concentrated formulation must never be used for intravenous regional anaesthesia.
  • Maximum safe doses must account for the site of injection and patient factors, with caution in hepatic impairment.

Monitoring

Monitor cardiovascular and neurological status during and after administration, watching for early signs of systemic local anaesthetic toxicity.

Counselling the patient

  • Numbness in the treated area is expected and wears off gradually.
  • Tell your team immediately if you feel dizzy, notice ringing in your ears, or a metallic taste.
  • Take care to protect the numb area from injury until sensation returns.

Evidence & guidelines

Bupivacaine is an established long-acting local anaesthetic with a well-defined efficacy and toxicity profile across regional anaesthesia techniques.

Reference: AAGBI LAST Guidelines 2023; Marcain SPC; NAP3 Report (Regional Anaesthesia); Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.