Bupivacaine
Bupivacaine, marketed under the brand name Marcaine among others, is a medication used to decrease sensation in a specific small area. In nerve blocks, it is injected 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 increase the duration of its action. It typically begins working within 15 minutes and lasts for 2 to 8 hours.
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Pronunciation | /bjuːˈpɪvəkeɪn/ |
Trade names | Marcaine, Sensorcaine, Posimir, others |
AHFS/Drugs.com | Monograph |
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Routes of administration | Parenteral, topical, implant |
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Bioavailability | n/a |
Protein binding | 95% |
Metabolism | Liver |
Onset of action | Within 15 min |
Elimination half-life | 3.1 hours (adults) 8.1 hours (neonates) |
Duration of action | 2 to 8 hr |
Excretion | Kidney, 4–10% |
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ECHA InfoCard | 100.048.993 |
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Formula | C18H28N2O |
Molar mass | 288.435 g·mol−1 |
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Melting point | 107 to 108 °C (225 to 226 °F) |
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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. Bupivacaine is available as a generic medication. An implantable formulation of bupivacaine (Xaracoll) was approved for medical use in the United States in August 2020.