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## Overview
Mylotat is the brand name for **mepivacaine hydrochloride** and **epinephrine** injection. Mepivacaine is a local anesthetic of the amino amide type. Epinephrine is a vasoconstrictor that prolongs the duration of action of the anesthetic and reduces systemic absorption.
## Primary Indications
* Local infiltration anesthesia
* Peripheral nerve blocks
* Epidural anesthesia
## Adult Dosing
Dosing is highly variable and depends on the site, volume, and concentration of the anesthetic used, as well as the patient's condition.
* **Local Infiltration:** Typical concentrations range from 1% to 2%. Maximum doses should not exceed 7 mg/kg of mepivacaine hydrochloride (plain solution) and 5 mg/kg (with epinephrine). Total dosage should not exceed 300 mg.
* **Peripheral Nerve Blocks:** Typically 1% to 2% solutions. Maximum doses as above.
* **Epidural Anesthesia:** Typically 1% to 2% solutions. Maximum doses as above.
Specific volumes and concentrations should be guided by the proceduralist and local anesthetic protocols.
## Pediatric Dosing
Mepivacaine with or without epinephrine has not been established in pediatric patients. Safety and efficacy have not been studied. If used, extreme caution and individualized dosing based on weight are necessary, with close monitoring for systemic toxicity.
## Dose Adjustments
* **Hepatic Impairment:** Use with caution due to decreased metabolism. Lower doses may be necessary.
* **Renal Impairment:** No significant dose adjustment is generally recommended for mild to moderate impairment, but use with caution in severe impairment.
* **Elderly Patients and Debilitated Patients:** May be more sensitive to systemic effects. Lower doses are recommended.
## Contraindications
* Known hypersensitivity to mepivacaine or other amide-type local anesthetics.
* Intravenous regional anesthesia (Bier block) due to risk of systemic toxicity upon tourniquet failure.
* Known hypersensitivity to epinephrine.
* Certain cardiovascular conditions where epinephrine is contraindicated (e.g., severe hypertension, hyperthyroidism, coronary artery disease).
## Adverse Effects
* **Nervous System:** Dizziness, lightheadedness, numbness of the tongue and lips, circumoral paresthesia, tinnitus, anxiety, nervousness, tremors, depression, drowsiness, unconsciousness, respiratory depression and arrest, nausea, vomiting.
* **Cardiovascular System:** Bradycardia, hypotension, hypertension, arrhythmias, cardiovascular collapse.
* **Allergic Reactions:** Rare, but can occur.
* **Epinephrine-Related:** Palpitations, tachycardia, increased blood pressure, anxiety, headache.
## Key Drug Interactions
* **Other CNS Depressants:** Additive CNS depression may occur.
* **Vasoconstrictors:** Epinephrine's effects can be potentiated by MAO inhibitors or tricyclic antidepressants.
* **Antiarrhythmics (e.g., Mexiletine, Tocainide):** Potential for additive cardiotoxicity.
* **Beta-Blockers:** May potentiate the pressor response to epinephrine.
## Monitoring
* Vital signs (heart rate, blood pressure, respiratory rate) during and after administration.
* Level of anesthesia achieved.
* Signs of systemic toxicity (CNS and cardiovascular effects).
* Local site for signs of adverse reaction.
## Clinical Pearls
* Always aspirate prior to injection to avoid intravascular administration.
* The addition of epinephrine prolongs the duration of action and reduces the rate of systemic absorption, but should be used with caution in patients with specific cardiovascular contraindications.
* Concentration matters: Higher concentrations increase the risk of systemic toxicity.
* Maximum doses are guidelines; individual patient factors are crucial.
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*This information is intended for clinical use and does not substitute for professional medical advice. Always verify current prescribing information with the manufacturer's official product insert or a reliable drug database.*
