|Trade names||Marcaine, Sensorcaine, Vivacaine, others|
|Onset of action||Within 15 min|
|Biological half-life||3.5 hours (adults)
8.1 hours (neonates)
|Duration of action||2 to 8 hr|
|Chemical and physical data|
|Molar mass||288.43 g/mol|
|3D model (Jmol)|
|Melting point||107 to 108 °C (225 to 226 °F)|
|(what is this?)|
Bupivacaine, marketed under the brand name Marcaine among others, is a medication used to decrease feeling in a specific area. It is used by injecting it into the area, around a nerve that supplies the area, or into the spinal canal's epidural space. It is available mixed with a small amount of epinephrine to make it last longer. It typically begins working within 15 minutes and lasts for 2 to 8 hours.
Possible side effects include sleepiness, muscle twitching, ringing in the ears, changes in vision, low blood pressure, and an irregular heart rate. Concerns exist that injecting it into a joint can cause problems with the cartilage. Concentrated bupivacaine is not recommended for epidural freezing. Epidural freezing may also increase the length of labor. It is a local anaesthetic of the amide group.
Bupivacaine was discovered in 1957. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. Bupivacaine is available as a generic medication and is not very expensive. The wholesale cost in the developing world of a vial is about US$2.10.
Bupivacaine is indicated for local infiltration, peripheral nerve block, sympathetic nerve block, and epidural and caudal blocks. It is sometimes used in combination with epinephrine to prevent systemic absorption and extend the duration of action. The 0.75% (most concentrated) formulation is used in retrobulbar block. It is the most commonly used local anesthetic in epidural anesthesia during labor, as well as in postoperative pain management.
Bupivacaine is contraindicated in patients with known hypersensitivity reactions to bupivacaine or amino-amide anesthetics. It is also contraindicated in obstetrical paracervical blocks and intravenous regional anaesthesia (Bier block) because of potential risk of tourniquet failure and systemic absorption of the drug and subsequent cardiac arrest. The 0.75% formulation is contraindicated in epidural anesthesia during labor because of the association with refractory cardiac arrest.
Compared to other local anaesthetics, bupivacaine is markedly cardiotoxic. However, adverse drug reactions (ADRs) are rare when it is administered correctly. Most ADRs are caused by accelerated absorption from the injection site, unintentional intravascular injection, or slow metabolic degradation. However, allergic reactions can rarely occur.
Clinically significant adverse events result from systemic absorption of bupivacaine and primarily involve the central nervous system (CNS) and cardiovascular system. CNS effects typically occur at lower blood plasma concentrations. Initially, cortical inhibitory pathways are selectively inhibited, causing symptoms of neuronal excitation. At higher plasma concentrations, both inhibitory and excitatory pathways are inhibited, causing CNS depression and potentially coma. Higher plasma concentrations also lead to cardiovascular effects, though cardiovascular collapse may also occur with low concentrations. Adverse CNS effects may indicate impending cardiotoxicity and should be carefully monitored.
- CNS: circumoral numbness, facial tingling, vertigo, tinnitus, restlessness, anxiety, dizziness, seizure, coma
- Cardiovascular: hypotension, arrhythmia, bradycardia, heart block, cardiac arrest
Toxicity can also occur in the setting of subarachnoid injection during high spinal anesthesia. These effects include: parasthesia, paralysis, apnea, hypoventilation, fecal incontinence, and urinary incontinence. Additionally, bupivacaine can cause chondrolysis after continuous infusion into a joint space.
Bupivacaine has caused several deaths when the epidural anaesthetic has been administered intravenously accidentally.
Treatment of overdose
Animal evidence indicates intralipid, a commonly available intravenous lipid emulsion, can be effective in treating severe cardiotoxicity secondary to local anaesthetic overdose, and human case reports of successful use in this way. Plans to publicize this treatment more widely have been published.
Pregnancy and lactation
Bupivacaine crosses the placenta and is a pregnancy category C drug. However, it is approved for use at term in obstetrical anesthesia. Bupivacaine is excreted in breast milk. Risks of discontinuing breast feeding versus discontinuing bupivacaine should be discussed with the patient.
Mechanism of action
Bupivacaine binds to the intracellular portion of voltage-gated sodium channels and blocks sodium influx into nerve cells, which prevents depolarization. Without depolarization, no initiation or conduction of a pain signal can occur.
The rate of systemic absorption of bupivacaine and other local anesthetics is dependent upon the dose and concentration of drug administered, the route of administration, the vascularity of the administration site, and the presence or absence of epinephrine in the preparation.
- Onset of action (route and dose-dependent): 1-17 min
- Duration of action (route and dose-dependent): 2-9 hr
- Half life: neonates, 8.1 hr, adults: 2.7 hr
- Time to peak plasma concentration (for peripheral, epidural, or caudal block): 30-45 min
- Protein binding: about 95%
- Metabolism: hepatic
- Excretion: renal (6% unchanged)
Like lidocaine, bupivacaine is an amino-amide anesthetic; the aromatic head and the hydrocarbon chain are linked by an amide bond rather than an ester as in earlier local anesthetics. As a result, the amino-amide anesthetics are more stable and less likely to cause allergic reactions. Unlike lidocaine, the terminal amino portion of bupivacaine (as well as mepivacaine, ropivacaine, and levobupivacaine) is contained within a piperidine ring; these agents are known as pipecholyl xylidines.
Levobupivacaine is the (S)-(–)-enantiomer of bupivacaine, with a longer duration of action, producing less vasodilation. Durect Corporation is developing a biodegradable, controlled-release drug delivery system for after surgery. It has currently completed a phase-III clinical trial.
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