Ropivacaine
Also known as: Naropin · Ropivacaine hydrochloride
Reviewed by the VetSheet Veterinary TeamUpdated Apr 5, 2026Evidence-based veterinary reference
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Dosing by species
🌎 NA — North America🌍 EU — Europe
Dogs
| Indication | Dose | Route | Frequency | Duration | Region |
|---|---|---|---|---|---|
| Analgesia (perineural, epidural, or intrapleural) | Up to 4 mg/kg | Perineural/Epidural/Intrapleural | q8h | — | 🌍 EU |
- Analgesia (perineural, epidural, or intrapleural): Lower doses should be used when systemic absorption is likely to be high (e.g., intrapleural). Can be diluted with normal saline for wider distribution.
Cats
| Indication | Dose | Route | Frequency | Duration | Region |
|---|---|---|---|---|---|
| Analgesia | Maximum 2 mg/kg | Perineural/Epidural/Intrapleural | — | — | 🌍 EU |
- Analgesia: The toxic dose has not been established in cats; it is recommended not to exceed 2 mg/kg.
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Overview
Ropivacaine is a long-acting amide local anesthetic used for the provision of analgesia via perineural nerve blocks, regional, and epidural techniques.
Compared to bupivacaine, ropivacaine has a slightly faster onset of action (10-20 minutes for epidural analgesia) and is less cardiotoxic. It also demonstrates higher selectivity for sensory nerves over motor nerves, which decreases the degree of associated motor blockade, allowing for better mobility post-procedure.
Clinical Warning: Ropivacaine must never be administered intravenously or used for intravenous regional anesthesia (Bier block) due to the risk of severe, refractory cardiac arrhythmias.
Mechanism of action
Ropivacaine produces local anesthesia through the reversible blockade of voltage-gated sodium channels in nerve fibers.
By binding to the intracellular portion of sodium channels, it prevents sodium influx → inhibits depolarization → prevents the generation and conduction of action potentials along the nerve fiber. Its higher lipid solubility allows it to preferentially block A-delta and C fibers (sensory/pain) over A-alpha fibers (motor).
Safety & warnings
Contraindications
- Intravenous (IV) administration
- Intravenous regional anaesthesia (Bier block)
Adverse effects
- Cardiac arrhythmias (if injected intravascularly)
- Systemic toxicity (CNS excitation followed by depression, seizures)
- Motor blockade (dose-dependent)
Precautions
Strictly avoid intravenous injection. Inadvertent intravascular injection may precipitate cardiac arrhythmias that are refractory to treatment.
- Aspiration: Always aspirate prior to injection to ensure the needle is not in a blood vessel.
- Systemic Absorption: Lower doses should be used when systemic absorption is likely to be high (e.g., intrapleural analgesia).
- Dilution: Small volumes can be diluted with normal saline to enable wider distribution for perineural blockade.
Drug interactions
Additive systemic toxicity; dose of ropivacaine should be reduced when used in combination.
Unlike some other local anesthetics, the addition of adrenaline does not appear to significantly alter the duration of the ropivacaine block.
Monitoring
- Heart rate and rhythm (ECG)
- Blood pressure
- Signs of CNS toxicity (twitching, tremors, seizures)
- Motor function recovery
Pharmacokinetics
Absorption
Systemic absorption depends on the route, dose, and vascularity of the injection site. Absorption is high following intrapleural administration.
Distribution
Distributes widely; can be diluted with normal saline to increase distribution volume for perineural blocks.
Metabolism
Hepatic metabolism (cytochrome P450 system).
Elimination
Excreted primarily via the kidneys as metabolites.
Overdose
Overdosage or inadvertent intravascular injection can lead to severe systemic toxicity.
- Cardiovascular: May precipitate severe cardiac arrhythmias that are highly refractory to standard treatments, hypotension, and cardiovascular collapse.
- CNS: May cause excitation, tremors, and seizures, followed by CNS depression.
- Treatment: Supportive care, oxygen therapy, seizure control (e.g., benzodiazepines), and potentially intravenous lipid emulsion (ILE) therapy for severe toxicity.
Available products
Formulations
- 2 mg/ml solution
- 7.5 mg/ml solution
- 10 mg/ml solution
Human-labeled
- Naropin 2 mg/ml solution
- Naropin 5 mg/ml solution
- Naropin 7.5 mg/ml solution
- Naropin 10 mg/ml solution
Regulatory status
POM (Prescription Only Medicine)
POM-V
No regulatory data for: 🇺🇸 US · 🇭🇰 HK · 🇹🇼 TW · 🇯🇵 JP · 🇰🇷 KR · 🇦🇺 AU
Storage & stability
Normal precautions should be observed. Store at room temperature. Do not freeze.
Client information
Ropivacaine is a local anesthetic used by your veterinarian to provide targeted pain relief during and after surgical procedures.
- It is administered directly into specific areas (like around nerves or the spinal cord) to numb the region.
- Because it is long-acting, your pet may experience numbness or mild weakness in the affected area for several hours (typically 3 to 8 hours) after the procedure.
- This medication is only administered in a clinical setting by veterinary professionals to ensure strict safety and monitoring.
VetSheet drug reference is intended for licensed veterinary professionals as a clinical decision-support aid, not a substitute for professional judgement or the manufacturer’s current label.