Lidocaine 50 mg/g Ointment, 1 tube
Other active recalls for Lidocaine (different manufacturers) — 1 · tap to view
🆔 Identity & classification
Where does this data come from?
🏷️ RxNorm drug class
This medicine belongs to the Antiarrhythmic class.
Where does this data come from?
🏭 Manufacturer & labeler
Where does this data come from?
🩺 Clinical
- It's best to avoid using two lidocaine products at the same time unless your doctor says it's okay. When you use multiple products containing a local anesthetic, the total amount a...
- Can I use a lidocaine patch and a lidocaine cream at the same time?
- No — please don't do this. Heat significantly increases how much lidocaine is absorbed through your skin, which can push drug levels in your blood higher than they should be. Stick...
- Can I put a heating pad on the area where I applied a lidocaine patch?
Patient education
Supplement & herbal interactions
Some supplements/herbs that may interact with Lidocaine — tap one for details:
Where does this data come from?
Ask a licensed pharmacist directly — free, answered by our team.
🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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UNII OJ4Z5Z32L4
A synthetic polymer made by linking ethylene glycol units together. It serves as a solvent, humectant to retain moisture, and film-forming agent in tablets and coatings to improve texture and drug delivery.
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UNII 5655G9Y8AQ
A synthetic liquid polymer used as a solvent and humectant in medications. It helps dissolve active ingredients, maintain moisture in the formulation, and improve how the medicine flows and is absorbed.
2 inactive ingredients listed in the exact product block matched to this NDC.
Where does this data come from?
ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
Are inactive ingredients the same for every manufacturer?
Why might an inactive ingredient be missing?
Can inactive ingredients matter?
💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per g | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | $0.162 | $5.72 / 35.44 g |
| Medicaid paysCMS SDUD · 12 mo | $0.3643 | $12.91 / 35.44 g |
| Medicare drug plans payPart D · Q2 2026 | $0.2915 | $10.33 / 35.44 g |
Where does this data come from?
🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Lidocaine 50 mg/g 51672-3008-03 | Sun | 50 g | $0.144 | AT | Discontinued | save 11% |
| Lidocaine 50 mg/g 64380-0789-23 | Strides | 30 g | $0.158 | AT | Discontinued | save 2% |
| Lidocaine 50 mg/g 33342-0405-30 | Macleods | 1 tube | $0.161 | AT | Availability likely | +0% |
| Lidocaine 50 mg/g 51672-3020-02 | Sun | 1 tube | $0.161 | AT | Availability likely | +0% |
| Lidocaine 50 mg/g 62332-0424-30 | Alembic | 1 tube | $0.161 | AT | Availability likely | +0% |
| Lidocaine 50 mg/gthis 00168-0204-37 | Fougera | 1 tube | $0.161 | AT | Availability likely | — |
| lidocaine 50 mg/g 16714-0878-01 | Northstar | 1 tube | $0.161 | AT | Availability likely | — |
| lidocaine 50 mg/g 68462-0418-20 | Glenmark | 1 tube | $0.161 | AT | Availability likely | — |
| Lidocaine 50 mg/g 70752-0113-03 | QUAGEN | 1 tube | $0.161 | AT | Availability likely | — |
| lidocaine 50 mg/g 75834-0333-30 | Nivagen | 30 g | $0.394 | — | Availability likely | +144% |
| Leader Maximum Strength Hemorrhoidal Relief 50 mg/g 70000-0650-01 | Cardinal | 1 tube | $0.394 | — | Availability likely | +144% |
| Lidocaine 5 g/100g 00362-0221-10 | Septodont, | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 17856-3008-01 | ATLANTIC | 120 syringes | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 46708-0424-30 | Alembic | 1 tube | — | AT | FDA listed | — |
| lidocaine 50 mg/g 50090-7922-00 | A-S | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 51407-0383-35 | Golden | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 59651-0591-30 | Aurobindo | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 63629-2503-01 | Bryant | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 63629-2504-01 | Bryant | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 63629-8848-01 | Bryant | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 65162-0918-41 | Amneal | 150 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 68071-3792-05 | NuCare | 1 jar | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 68788-4050-05 | Preferred | 1 jar | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 68788-7376-03 | Preferred | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 68788-7766-05 | Preferred | 50 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 68788-8396-05 | Preferred | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 70518-3746-00 | REMEDYREPACK | 1 tube | — | AT | FDA listed | — |
| lidocaine 50 mg/g 70518-3902-00 | REMEDYREPACK | 50 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 70518-3972-00 | REMEDYREPACK | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 70518-4192-00 | REMEDYREPACK | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 71205-0288-50 | Proficient | 1 jar | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 71205-0342-44 | Proficient | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 71205-0429-30 | Proficient | 1 tube | — | AT | FDA listed | — |
| lidocaine 50 mg/g 71205-0500-44 | Proficient | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 71205-0549-44 | Proficient | 35.44 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 71205-0717-50 | Proficient | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 71205-0814-44 | Proficient | 35.44 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 71335-2856-01 | Bryant | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72162-2068-02 | Bryant | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72162-2084-02 | Bryant | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0165-35 | DIRECT | 35.44 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0168-35 | DIRECT | 35.44 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0211-50 | DIRECT | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0488-50 | Direct_Rx | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0493-35 | Direct_Rx | 35.44 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0499-50 | Direct_Rx | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 72189-0601-35 | Direct_rx | 35 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 76420-0125-50 | Asclemed | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 76420-0131-50 | Asclemed | 50 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 76420-0550-35 | Asclemed | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 80425-0247-01 | Advanced | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 80425-0248-01 | Advanced | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 80425-0324-01 | Advanced | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 80425-0442-01 | Advanced | 50 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 80425-0450-01 | Advanced | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 80425-0509-01 | Advanced | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 80425-0538-01 | Advanced | 1 jar | — | AT | FDA listed | — |
| lidocaine 50 mg/g 80425-0554-01 | Advanced | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 83008-0044-50 | Quality | 1 jar | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 83008-0067-50 | Quality | 50 g | — | AT | FDA listed | — |
| lidocaine 50 mg/g 85509-1418-03 | PHOENIX | 1 tube | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 85509-1424-05 | PHOENIX | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 85509-1918-01 | PHOENIX | 50 g | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 85509-3008-05 | PHOENIX | 1 jar | — | AT | FDA listed | — |
| Lidocaine 50 mg/g 87063-0144-50 | Asclemed | 1 tube | — | AT | FDA listed | — |
| Maximum Strength Hemorrhoidal Relief 50 mg/g 51316-0226-00 | CVS | 1 tube | — | — | FDA listed | — |
| MAXIMUM STRENGTH HEMORRHOIDAL RELIEF with Finger Cots 50 mg/g 51316-0229-00 | CVS | 1 tube | — | — | FDA listed | — |
| Microcaine Topical Analgesic 50 mg/g 67194-0022-01 | Unit | 15 g | — | — | FDA listed | — |
| DR REAL NUMB Topical Anorectal 50 mg/g 83800-0430-00 | FUZZYLULU | 1 tube | — | — | FDA listed | — |
| RectaEase Hemorrhoid Relief Cream 50 mg/g 69396-0070-01 | Trifecta | 1 tube | — | — | FDA listed | — |
| Numb520 50 mg/g 63742-0033-01 | Clinical | 1 bottle | — | — | FDA listed | — |
| Numb 520 50 mg/g 72654-0033-02 | Ebanel | 125 g | — | — | FDA listed | — |
| PUREGEN LABS Maximum Strength Lidocaine 50 mg/g 80513-0813-06 | Advanced | 170 g | — | — | FDA listed | — |
| Numb Master 50 mg/g 63742-0032-01 | Clinical | 1 bottle | — | — | FDA listed | — |
| Numb25 50 mg/g 63742-0035-01 | Clinical | 38 g | — | — | FDA listed | — |
| Recticare 50 mg/g 00496-0892-15 | Ferndale | 15 g | — | — | FDA listed | — |
| Numb25 50 mg/g 72654-0036-02 | Ebanel | 125 g | — | — | FDA listed | — |
| Lmx5 50 mg/g 00496-0883-15 | Ferndale | 15 g | — | — | FDA listed | — |
| HemRid Anorectal Cream 50 mg/g 82620-0001-01 | KKA | 1 tube | — | — | FDA listed | — |
| Lidocaine 50 mg/g 58980-0823-30 | STRATUS | 1 tube | — | — | FDA listed | — |
| Quick Numb 50 mg/g 63742-0333-01 | Clinical | 35.43 g | — | — | FDA listed | — |
| Lidocaine 5% Cream 50 mg/g 82461-0420-30 | Medcore | 1 tube | — | — | FDA listed | — |
| Dr. Care Numbing Cream 50 mg/g 84019-0038-01 | Shengnan | 30 g | — | — | FDA listed | — |
| Equate Hemorrhoid Relief 50 mg/g 79903-0428-01 | Walmart | 1 tube | — | — | FDA listed | — |
| Lidocaine 50 mg/g 50090-8011-00 | A-S | 1 tube | — | AT | FDA listed | — |
| Lidocaine Cream 50 mg/g 71457-0525-15 | InvaDerm | 1 tube | — | — | FDA listed | — |
| Lidocaine 50 mg/g 50090-8040-00 | A-S | 1 tube | — | AT | FDA listed | — |
Where does this data come from?
⏳ Availability & generic status
This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.
Where does this data come from?
🗺️ Medicaid utilization & spend
📊 Medicare Part D spend CMS · PART D · 2026 (Q1)
🔬 Reported adverse events (FAERS)
Top reported reactions
Age at onset
Reporter sex
Serious outcomes
Where does this data come from?
📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 00168-0204-37 You're viewing this | 1 TUBE in 1 CARTON (0168-0204-37) / 35.44 g in 1 TUBE | 1972-06-30 | Active |
📄 Full prescribing information FDA SPL
🎯 Indications and Usage ▾
INDICATIONS AND USAGE Lidocaine Ointment 5% is indicated for production of anesthesia of accessible mucous membranes of the oropharynx. It is also useful as an anesthetic lubricant for intubation and for the temporary relief of pain associated with minor burns, including sunburn, abrasions of the skin, and insect bites.
⏱️ Dosage and Administration ▾
DOSAGE AND ADMINISTRATION When Lidocaine Ointment 5% is used concomitantly with other products containing lidocaine, the total dose contributed by all formulations must be kept in mind. Adult: A single application should not exceed 5 g of Lidocaine Ointment 5%, containing 250 mg of lidocaine base (equivalent chemically to approximately 300 mg of lidocaine hydrochloride). This is roughly equivalent to squeezing a six (6) inch length of ointment from the tube.
In a 70 kg adult this dose equals 3.6 mg/kg (1.6 mg/lb) lidocaine base. No more than one-half tube, approximately 17 - 20 g of ointment or 850 - 1000 mg lidocaine base, should be administered in any one day. Although the incidence of adverse effects with Lidocaine Ointment 5% is quite low, caution should be exercised, particularly when employing large amounts, since the incidence of adverse effects is directly proportional to the total dose of local anesthetic agent administered.
Dosage for children: It is difficult to recommend a maximum dose of any drug for children since this varies as a function of age and weight. For children less than ten years who have a normal lean body mass and a normal lean body development, the maximum dose may be determined by the application of one of the standard pediatric drug formulas (e.g., Clark's rule). For example a child of five years weighing 50 lbs., the dose of lidocaine should not exceed 75 - 100 mg when calculated according to Clark's rule.
In any case, the maximum amount of lidocaine administered should not exceed 4.5 mg/kg (2.0 mg/lb) of body weight. Administration: For medical use, apply topically for adequate control of symptoms. The use of a sterile gauze pad is suggested for application to broken skin tissue.
Apply to the tube prior to intubation. In dentistry, apply to previously dried oral mucosa. Subsequent removal of excess saliva with cotton rolls or saliva ejector minimizes dilution of the ointment, permits maximum penetration, and minimizes the possibility of swallowing the topical ointment.
For use in connection with the insertion of new dentures, apply to all denture surfaces contacting mucosa. IMPORTANT: Patients should consult a dentist at intervals not exceeding 48 hours throughout the fitting period.
⛔ Contraindications ▾
CONTRAINDICATIONS Lidocaine is contraindicated in patients with a known history of hypersensitivity to local anesthetics of the amide type or to other components of Lidocaine Ointment 5%.
⚠️ Warnings ▾
WARNINGS EXCESSIVE DOSAGE, OR SHORT INTERVALS BETWEEN DOSES, CAN RESULT IN HIGH PLASMA LEVELS AND SERIOUS ADVERSE EFFECTS, PATIENTS SHOULD BE INSTRUCTED TO STRICTLY ADHERE TO THE RECOMMENDED DOSAGE AND ADMINISTRATION GUIDELINES AS SET FORTH IN THIS PACKAGE INSERT. THE MANAGEMENT OF SERIOUS ADVERSE REACTIONS MAY REQUIRE THE USE OF RESUSCITATIVE EQUIPMENT, OXYGEN, AND OTHER RESUSCITATIVE DRUGS. Lidocaine Ointment 5% should be used with extreme caution in the presence of sepsis or severely traumatized mucosa in the area of application, since under such conditions there is the potential for rapid systemic absorption.
Methemoglobinemia Cases of methemoglobinemia have been reported in association with local anesthetic use. Although all patients are at risk for methemoglobinemia, patients with glucose-6-phosphate dehydrogenase deficiency, congenital or idiopathic methemoglobinemia, cardiac or pulmonary compromise, infants under 6 months of age, and concurrent exposure to oxidizing agents or their metabolites are more susceptible to developing clinical manifestations of the condition. If local anesthetics must be used in these patients, close monitoring for symptoms and signs of methemoglobinemia is recommended.
Signs and symptoms of methemoglobinemia may occur immediately or may be delayed some hours after exposure, and are characterized by a cyanotic skin discoloration and abnormal coloration of the blood. Methemoglobin levels may continue to rise; therefore, immediate treatment is required to avert more serious central nervous system and cardiovascular adverse effects, including seizures, coma, arrhythmias, and death. Discontinue Lidocaine Ointment USP, 5% and any other oxidizing agents.
Depending on the severity of the symptoms, patients may respond to supportive care, i.e., oxygen therapy, hydration. More severe symptoms may require treatment with methylene blue, exchange transfusion, or hyperbaric oxygen.
🤒 Adverse Reactions ▾
ADVERSE REACTIONS Adverse experiences following the administration of lidocaine are similar in nature to those observed with other amide local anesthetic agents. These adverse experiences are, in general, dose-related and may result from high plasma levels caused by excessive dosage or rapid absorption, or may result from a hypersensitivity, idiosyncrasy or diminished tolerance on the part of the patient. Serious adverse experiences are generally systemic in nature.
The following types are those most commonly reported: Central nervous system: CNS manifestations are excitatory and/or depressant and may be characterized by lightheadedness, nervousness, apprehension, euphoria, confusion, dizziness, drowsiness, tinnitus, blurred or double vision, vomiting, sensations of heat, cold or numbness, twitching, tremors, convulsions, unconsciousness, respiratory depression and arrest. The excitatory manifestations may be very brief or may not occur at all, in which case the first manifestation of toxicity may be drowsiness merging into unconsciousness and respiratory arrest.
Drowsiness following the administration of lidocaine is usually an early sign of a high blood level of the drug and may occur as a consequence of rapid absorption. Cardiovascular system: Cardiovascular manifestations are usually depressant and are characterized by bradycardia, hypotension, and cardiovascular collapse, which may lead to cardiac arrest. Allergic: Allergic reactions are characterized by cutaneous lesions, urticaria, edema or anaphylactoid reactions.
Allergic reactions may occur as a result of sensitivity either to the local anesthetic agent or to other components in the formulation. Allergic reactions as a result of sensitivity to lidocaine are extremely rare and, if they occur, should be managed by conventional means. The detection of sensitivity by skin testing is of doubtful value.
🔄 Drug Interactions ▾
Drug Interactions Patients that are administered local anesthetics may be at increased risk of developing methemoglobinemia when concurrently exposed to the following drugs, which could include other local anesthetics: Examples of Drugs Associated with Methemoglobinemia: Class Examples Nitrates/Nitrites nitric oxide, nitroglycerin, nitroprusside, nitrous oxide Local anesthetics articaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, procaine, ropivacaine, tetracaine Antineoplastic Agents cyclophosphamide, flutamide, hydroxyurea, ifosfamide, rasburicase Antibiotics dapsone, nitrofurantoin, para-aminosalicylic acid, sulfonamides Antimalarials chloroquine, primaquine Anticonvulsants Phenobarbital, phenytoin, sodium valproate Other drugs acetaminophen, metoclopramide, quinine, sulfasalazine
🤰 Pregnancy ▾
Use in Pregnancy: Teratogenic Effects. Pregnancy Category B. Reproduction studies have been performed in rats at doses up to 6.6 times the human dose and have revealed no evidence of harm to the fetus caused by lidocaine.
There are, however, no adequate and well-controlled studies in pregnant women. Animal reproduction studies are not always predictive of human response. General consideration should be given to this fact before administering lidocaine to women of childbearing potential, especially during early pregnancy when maximum organogenesis takes place.
🧒 Pediatric Use ▾
Pediatric use: Dosage in children should be reduced, commensurate with age, body weight and physical condition. Caution must be taken to avoid overdosage when applying Lidocaine Ointment 5% to large areas of injured or abraded skin, since the systemic absorption of lidocaine may be increased under such conditions. See DOSAGE and ADMINISTRATION .
🆘 Overdosage ▾
OVERDOSAGE Acute emergencies from local anesthetics are generally related to high plasma levels encountered during therapeutic use of local anesthetics. (see ADVERSE REACTIONS , WARNINGS , and PRECAUTIONS ). Management of local anesthetic emergencies: The first consideration is prevention, best accomplished by careful and constant monitoring of cardiovascular and respiratory vital signs and the patient's state of consciousness after each local anesthetic administration.
At the first sign of change, oxygen should be administered. The first step in the management of convulsions consists of immediate attention to the maintenance of a patent airway and assisted or controlled ventilation with oxygen and a delivery system capable of permitting immediate positive airway pressure by mask. Immediately after the institution of these ventilatory measures, the adequacy of the circulation should by evaluated, keeping in mind that drugs used to treat convulsions sometimes depress the circulation when administered intravenously.
Should convulsions persist despite adequate respiratory support, and if the status of the circulation permits, small increments of an ultra-short acting barbiturate (such as thiopental or thiamylal) or a benzodiazepine (such as diazepam) may be administered intravenously. The clinician should be familiar, prior to use of local anesthetics, with these anticonvulsant drugs. Supportive treatment of circulatory depression may require administration of intravenous fluids and, when appropriate, a vasopressor as directed by the clinical situation (e.g., ephedrine).
If not treated immediately, both convulsions and cardiovascular depression can result in hypoxia, acidosis, bradycardia, arrhythmias and cardiac arrest. If cardiac arrest should occur, standard cardiopulmonary resuscitative measures should be instituted. Dialysis is of negligible value in the treatment of acute overdosage with lidocaine.
The oral LD 50 of lidocaine HCI in non-fasted female rats is 459 (346 - 773) mg/kg (as the salt) and 214 (159 - 324) mg/kg (as the salt) in fasted female rats.
🧬 Clinical Pharmacology ▾
CLINICAL PHARMACOLOGY Mechanism of action: Lidocaine stabilizes the neuronal membrane by inhibiting the ionic fluxes required for the initiation and conduction of impulses, thereby effecting local anesthetic action. Onset of anesthesia: Lidocaine Ointment 5% effects local, topical anesthesia. The onset of action is 3 - 5 minutes.
It is ineffective when applied to intact skin. Hemodynamics: Excessive blood levels may cause changes in cardiac output, total peripheral resistance, and mean arterial pressure. These changes may be attributable to a direct depressant effect of the local anesthetic agent on various components of the cardiovascular system.
Pharmacokinetics and metabolism: Lidocaine may be absorbed following topical administration to mucous membranes, its rate and extent of absorption depending upon the specific site of application, duration of exposure, concentration, and total dosage. In general, the rate of absorption of local anesthetic agents following topical application occurs most rapidly after intratracheal administration. Lidocaine is also well-absorbed from the gastrointestinal tract, but little intact drug appears in the circulation because of biotransformation in the liver.
Lidocaine is metabolized rapidly by the liver, and metabolites and unchanged drug are excreted by the kidneys. Biotransformation includes oxidative N-dealkylation, ring hydroxylation, cleavage of the amide linkage, and conjugation. N-dealkylation, a major pathway of biotransformation, yields the metabolites monoethylglycinexylidide and glycinexylidide.
The pharmacological/toxicological actions of these metabolites are similar to, but less potent than, those of lidocaine. Approximately 90% of lidocaine administered is excreted in the form of various metabolites, and less than 10% is excreted unchanged. The primary metabolite in urine is a conjugate of 4-hydroxy-2,6-dimethylaniline.
The plasma binding of lidocaine is dependent on drug concentration, and the fraction bound decreases with increasing concentration. At concentrations of 1 to 4 μg of free base per mL, 60 to 80 percent of lidocaine is protein bound. Binding is also dependent on the plasma concentration of the alpha-l-acid glycoprotein.
Lidocaine crosses the blood-brain and placental barriers, presumably by passive diffusion. Studies of lidocaine metabolism following intravenous bolus injections have shown that the elimination half-life of this agent is typically 1.5 to 2.0 hours. Because of the rapid rate at which lidocaine is metabolized, any condition that affects liver function may alter lidocaine kinetics.
The half-life may be prolonged two-fold or more in patients with liver dysfunction. Renal dysfunction does not affect lidocaine kinetics but may increase the accumulation of metabolites. Factors such as acidosis and the use of CNS stimulants and depressants affect the CNS levels of lidocaine required to produce overt systemic effects.
Objective adverse manifestations become increasingly apparent with increasing venous plasma levels above 6.0 μ g free base per mL. In the rhesus monkey arterial blood levels of 18 - 21 μ g/mL have been shown to be threshold for convulsive activity.
📦 How Supplied / Storage and Handling ▾
HOW SUPPLIED Lidocaine Ointment USP, 5% is supplied in 35.44 g (1 1 / 4 oz) laminate tubes with a child-resistant cap, NDC 0168-0204-37. Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F). E. FOUGERA & CO. A division of Fougera PHARMACEUTICALS INC. Melville, New York 11747 46265489 Revised: 10/2023
📋 Description ▾
DESCRIPTION Lidocaine Ointment 5% contains a local anesthetic agent and is administered topically. See INDICATIONS AND USAGE for specific uses. Lidocaine Ointment 5% contains lidocaine, which is chemically designated as acetamide, 2-(diethylamino)- N -(2,6-dimethylphenyl)-, and has the following structural formula: Composition of Lidocaine Ointment 5%: acetamide, 2-(diethylamino)- N -(2,6-dimethylphenyl)-, (lidocaine) 5% in a water miscible ointment vehicle containing polyethylene glycols. structuralformula
💬 Information for Patients ▾
Information for Patients: Inform patients that use of local anesthetics may cause methemoglobinemia, a serious condition that must be treated promptly. Advise patients or caregivers to stop use and seek immediate medical attention if they or someone in their care experience the following signs or symptoms: pale, gray, or blue colored skin (cyanosis); headache; rapid heart rate; shortness of breath; lightheadedness; or fatigue. When topical anesthetics are used in the mouth, the patient should be aware that the production of topical anesthesia may impair swallowing and thus enhance the danger of aspiration.
For this reason, food should not be ingested for 60 minutes following the use of local anesthetic preparations in the mouth or throat area. This is particularly important in children because of their frequency of eating. Numbness of the tongue or buccal mucosa may enhance the danger of unintentional biting trauma.
Food and chewing gum should not be taken while the mouth or throat area is anesthetized.