Product Elements:
Lidocaine lidocaine lidocaine lidocaine urea edetate disodium gelatin, unspecified glycerin methylparaben polyvinyl alcohol, unspecified propylene glycol propylparaben carboxymethylcellulose sodium, unspecified tartaric acid dihydroxyaluminum aminoacetate kaolin polyacrylic acid (250000 mw) sodium polyacrylate (2500000 mw) sorbitol chemical structure figure 1
Drug Interactions:
Drug interactions antiarrhythmic drugs lidocaine patch 5% should be used with caution in patients receiving class i antiarrhythmic drugs (such as tocainide and mexiletine) since the toxic effects are additive and potentially synergistic. local anesthetics when lidocaine patch 5% is used concomitantly with other products containing local anesthetic agents, the amount absorbed from all formulations must be considered. drugs that may cause methemoglobinemia when used with lidocaine patch 5% patients who are administered local anesthetics are 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, fl
Read more...utamide, hydroxyurea, ifosfamide, rasburicase antibiotics dapsone, nitrofurantoin, para-aminosalicylic acid, sulfonamides antimalarials chloroquine, primaquine anticonvulsants phenobarbital, phenytoin, sodium valproate other drugs acetaminophen, metoclopramide, quinine, sulfasalazine
Indications and Usage:
Indication and usage lidocaine patch 5% is indicated for relief of pain associated with post-herpetic neuralgia. it should be applied only to intact skin .
Warnings:
Warnings risk of 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 of methemoglobinemia may occur immediately or may be delayed some hours after exposure, and are characterized by a cyanotic skin discoloration and/or 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, com
Read more...a, arrhythmias, and death. discontinue lidocaine patch 5% and any other oxidizing agents. depending on the severity of the signs and symptoms, patients may respond to supportive care, i.e., oxygen therapy, hydration. a more severe clinical presentation may require treatment with methylene blue, exchange transfusion, or hyperbaric oxygen. accidental exposure in children even a used lidocaine patch 5% patch contains a large amount of lidocaine (at least 665 mg). the potential exists for a small child or a pet to suffer serious adverse effects from chewing or ingesting a new or used lidocaine patch 5% patch, although the risk with this formulation has not been evaluated. it is important for patients to store and dispose of lidocaine patch 5% out of the reach of children, pets and others . (see handling and disposal ) excessive dosing excessive dosing by applying lidocaine patch 5% to larger areas or for longer than the recommended wearing time could result in increased absorption of lidocaine and high blood concentrations, leading to serious adverse effects (see adverse reactions, systemic reactions ). lidocaine toxicity could be expected at lidocaine blood concentrations above 5 mcg/ml. the blood concentration of lidocaine is determined by the rate of systemic absorption and elimination. longer duration of application, application of more than the recommended number of patches, smaller patients, or impaired elimination may all contribute to increasing the blood concentration of lidocaine. with recommended dosing of lidocaine patch 5%, the average peak blood concentration is about 0.13 mcg/ml, but concentrations higher than 0.25 mcg/ml have been observed in some individuals.
General Precautions:
General hepatic disease patients with severe hepatic disease are at greater risk of developing toxic blood concentrations of lidocaine, because of their inability to metabolize lidocaine normally. allergic reactions patients allergic to paraâaminobenzoic acid derivatives (procaine, tetracaine, benzocaine, etc.) have not shown cross sensitivity to lidocaine. however, lidocaine patch 5% should be used with caution in patients with a history of drug sensitivities, especially if the etiologic agent is uncertain. non-intact skin application to broken or inflamed skin, although not tested, may result in higher blood concentrations of lidocaine from increased absorption. lidocaine patch 5% is only recommended for use on intact skin. external heat sources placement of external heat sources, such as heating pads or electric blankets, over lidocaine patch 5% patches is not recommended as this has not been evaluated and may increase plasma lidocaine levels. eye exposure the contact of lidoca
Read more...ine patch 5% with eyes, although not studied, should be avoided based on the findings of severe eye irritation with the use of similar products in animals. if eye contact occurs, immediately wash out the eye with water or saline and protect the eye until sensation returns.
Dosage and Administration:
Dosage and administration apply lidocaine patch 5% to intact skin to cover the most painful area. apply the prescribed number of patches (maximum of 3), only once for up to 12 hours within a 24 hour period. patches may be cut into smaller sizes with scissors prior to removal of the release liner. (see handling and disposal ) clothing may be worn over the area of application. smaller areas of treatment are recommended in a debilitated patient, or a patient with impaired elimination. if irritation or a burning sensation occurs during application, remove the patch(es) and do not reapply until the irritation subsides. when lidocaine patch 5% is used concomitantly with other products containing local anesthetic agents, the amount absorbed from all formulations must be considered. lidocaine patch 5% may not stick if it gets wet. avoid contact with water, such as bathing, swimming or showering.
Contraindications:
Contraindications lidocaine patch 5% is contraindicated in patients with a known history of sensitivity to local anesthetics of the amide type, or to any other component of the product.
Adverse Reactions:
Adverse reactions application site reactions during or immediately after treatment with lidocaine patch 5%, the skin at the site of application may develop blisters, bruising, burning sensation, depigmentation, dermatitis, discoloration, edema, erythema, exfoliation, irritation, papules, petechia, pruritus, vesicles, or may be the locus of abnormal sensation. these reactions are generally mild and transient, resolving spontaneously within a few minutes to hours. allergic reactions allergic and anaphylactoid reactions associated with lidocaine, although rare, can occur. they are characterized by angioedema, bronchospasm, dermatitis, dyspnea, hypersensitivity, laryngospasm, pruritus, shock, and urticaria. if they occur, they should be managed by conventional means. the detection of sensitivity by skin testing is of doubtful value. other adverse events due to the nature and limitation of spontaneous reports in postmarketing surveillance, causality has not been established for additional r
Read more...eported adverse events including: asthenia, confusion, disorientation, dizziness, headache, hyperesthesia, hypoesthesia, lightheadedness, metallic taste, nausea, nervousness, pain exacerbated, paresthesia, somnolence, taste alteration, vomiting, visual disturbances such as blurred vision, flushing, tinnitus, and tremor. systemic (dose-related) reactions systemic adverse reactions following appropriate use of lidocaine patch 5% are unlikely, due to the small dose absorbed (see clinical pharmacology, pharmacokinetics ). systemic adverse effects of lidocaine are similar in nature to those observed with other amide local anesthetic agents, including cns excitation and/or depression (light headedness, 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). excitatory cns reactions may be brief or not occur at all, in which case the first manifestation may be drowsiness merging into unconsciousness. cardiovascular manifestations may include bradycardia, hypotension and cardiovascular collapse leading to arrest.
Drug Interactions:
Drug interactions antiarrhythmic drugs lidocaine patch 5% should be used with caution in patients receiving class i antiarrhythmic drugs (such as tocainide and mexiletine) since the toxic effects are additive and potentially synergistic. local anesthetics when lidocaine patch 5% is used concomitantly with other products containing local anesthetic agents, the amount absorbed from all formulations must be considered. drugs that may cause methemoglobinemia when used with lidocaine patch 5% patients who are administered local anesthetics are 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, fl
Read more...utamide, hydroxyurea, ifosfamide, rasburicase antibiotics dapsone, nitrofurantoin, para-aminosalicylic acid, sulfonamides antimalarials chloroquine, primaquine anticonvulsants phenobarbital, phenytoin, sodium valproate other drugs acetaminophen, metoclopramide, quinine, sulfasalazine
Use in Pregnancy:
Pregnancy teratogenic effects pregnancy category b. lidocaine patch 5% has not been studied in pregnancy. reproduction studies with lidocaine have been performed in rats at doses up to 30 mg/kg subcutaneously and have revealed no evidence of harm to the fetus due to lidocaine. there are, however, no adequate and well-controlled studies in pregnant women. because animal reproduction studies are not always predictive of human response, lidocaine patch 5% should be used during pregnancy only if clearly needed.
Pediatric Use:
Pediatric use safety and effectiveness in pediatric patients have not been established.
Overdosage:
Overdosage lidocaine overdose from cutaneous absorption is rare, but could occur. if there is any suspicion of lidocaine overdose (see adverse reactions, systemic reactions ), drug blood concentration should be checked. the management of overdose includes close monitoring, supportive care, and symptomatic treatment. dialysis is of negligible value in the treatment of acute overdose with lidocaine. in the absence of massive topical overdose or oral ingestion, evaluation of symptoms of toxicity should include consideration of other etiologies for the clinical effects, or overdosage from other sources of lidocaine or other local anesthetics. the oral ld 50 of lidocaine hcl is 459 (346-773) mg/kg (as the salt) in non-fasted female rats and 214 (159-324) mg/kg (as the salt) in fasted female rats, which are equivalent to roughly 4000 mg and 2000 mg, respectively, in a 60 to 70 kg man based on the equivalent surface area dosage conversion factors between species.
Description:
Description lidocaine patch 5% is comprised of an adhesive material containing 5% lidocaine, which is applied to a nonâwoven polyester felt backing and covered with a polyethylene terephthalate (pet) film release liner. the release liner is removed prior to application to the skin. the size of the patch is 10 cm x 14 cm. lidocaine is chemically designated as acetamide, 2â(diethylamino)ânâ(2,6â dimethylphenyl), has an octanol: water partition ratio of 43 at ph 7.4, and has the following structure: each adhesive patch contains 700 mg of lidocaine (50 mg per gram adhesive) in an aqueous base. it also contains the following inactive ingredients: dihydroxyaluminum aminoacetate, disodium edetate, gelatin, glycerin, kaolin, methylparaben, polyacrylic acid, polyvinyl alcohol, propylene glycol, propylparaben, sodium carboxymethylcellulose, sodium polyacrylate, d-sorbitol, tartaric acid, and urea.
Clinical Pharmacology:
Clinical pharmacology pharmacodynamics lidocaine is an amide-type local anesthetic agent and is suggested to stabilize neuronal membranes by inhibiting the ionic fluxes required for the initiation and conduction of impulses. the penetration of lidocaine into intact skin after application of lidocaine patch 5% is sufficient to produce an analgesic effect, but less than the amount necessary to produce a complete sensory block. pharmacokinetics absorption the amount of lidocaine systemically absorbed from lidocaine patch 5% is directly related to both the duration of application and the surface area over which it is applied. in a pharmacokinetic study, three lidocaine patch 5% patches were applied over an area of 420 cm 2 of intact skin on the back of normal volunteers for 12 hours. blood samples were withdrawn for determination of lidocaine concentration during the application and for 12 hours after removal of patches. the results are summarized in table 1. table 1 absorption of lidocain
Read more...e from lidocaine patch 5% normal volunteers (n = 15, 12-hour wearing time) lidocaine patch 5% application site area (cm 2 ) dose absorbed (mg) c max (mcg/ml) t max (hr) 3 patches (2100 mg) back 420 64 ± 32 0.13 ± 0.06 11 hr when lidocaine patch 5% is used according to the recommended dosing instructions, only 3 ± 2% of the dose applied is expected to be absorbed. at least 95% (665 mg) of lidocaine will remain in a used patch. mean peak blood concentration of lidocaine is about 0.13 mcg/ml (about 1/10 of the therapeutic concentration required to treat cardiac arrhythmias). repeated application of three patches simultaneously for 12 hours (recommended maximum daily dose), once per day for three days, indicated that the lidocaine concentration does not increase with daily use. the mean plasma pharmacokinetic profile for the 15 healthy volunteers is shown in figure 1. figure 1 mean lidocaine blood concentrations after three consecutive daily applications of three lidocaine patch 5% patches simultaneously for 12 hours per day in healthy volunteers (n = 15). distribution when lidocaine is administered intravenously to healthy volunteers, the volume of distribution is 0.7 to 2.7 l/kg (mean 1.5 ± 0.6 sd, n=15). at concentrations produced by application of lidocaine patch 5%, lidocaine is approximately 70% bound to plasma proteins, primarily alphaâ1âacid glycoprotein. at much higher plasma concentrations (1 to 4 mcg/ml of free base), the plasma protein binding of lidocaine is concentration dependent. lidocaine crosses the placental and blood brain barriers, presumably by passive diffusion. metabolism it is not known if lidocaine is metabolized in the skin. lidocaine is metabolized rapidly by the liver to a number of metabolites, including monoethylglycinexylidide (megx) and glycinexylidide (gx), both of which have pharmacologic activity similar to, but less potent than that of lidocaine. a minor metabolite, 2, 6-xylidine, has unknown pharmacologic activity but is carcinogenic in rats. the blood concentration of this metabolite is negligible following application of lidocaine patch 5%. following intravenous administration, megx and gx concentrations in serum range from 11 to 36% and from 5 to 11% of lidocaine concentrations, respectively. excretion lidocaine and its metabolites are excreted by the kidneys. less than 10% of lidocaine is excreted unchanged. the half-life of lidocaine elimination from the plasma following iv administration is 81 to 149 minutes (mean 107 ± 22 sd, n = 15). the systemic clearance is 0.33 to 0.90 l/min (mean 0.64 ± 0.18 sd, n = 15).
Pharmacodynamics:
Pharmacodynamics lidocaine is an amide-type local anesthetic agent and is suggested to stabilize neuronal membranes by inhibiting the ionic fluxes required for the initiation and conduction of impulses. the penetration of lidocaine into intact skin after application of lidocaine patch 5% is sufficient to produce an analgesic effect, but less than the amount necessary to produce a complete sensory block.
Pharmacokinetics:
Pharmacokinetics absorption the amount of lidocaine systemically absorbed from lidocaine patch 5% is directly related to both the duration of application and the surface area over which it is applied. in a pharmacokinetic study, three lidocaine patch 5% patches were applied over an area of 420 cm 2 of intact skin on the back of normal volunteers for 12 hours. blood samples were withdrawn for determination of lidocaine concentration during the application and for 12 hours after removal of patches. the results are summarized in table 1. table 1 absorption of lidocaine from lidocaine patch 5% normal volunteers (n = 15, 12-hour wearing time) lidocaine patch 5% application site area (cm 2 ) dose absorbed (mg) c max (mcg/ml) t max (hr) 3 patches (2100 mg) back 420 64 ± 32 0.13 ± 0.06 11 hr when lidocaine patch 5% is used according to the recommended dosing instructions, only 3 ± 2% of the dose applied is expected to be absorbed. at least 95% (665 mg) of lidocaine will remain in a us
Read more...ed patch. mean peak blood concentration of lidocaine is about 0.13 mcg/ml (about 1/10 of the therapeutic concentration required to treat cardiac arrhythmias). repeated application of three patches simultaneously for 12 hours (recommended maximum daily dose), once per day for three days, indicated that the lidocaine concentration does not increase with daily use. the mean plasma pharmacokinetic profile for the 15 healthy volunteers is shown in figure 1. figure 1 mean lidocaine blood concentrations after three consecutive daily applications of three lidocaine patch 5% patches simultaneously for 12 hours per day in healthy volunteers (n = 15). distribution when lidocaine is administered intravenously to healthy volunteers, the volume of distribution is 0.7 to 2.7 l/kg (mean 1.5 ± 0.6 sd, n=15). at concentrations produced by application of lidocaine patch 5%, lidocaine is approximately 70% bound to plasma proteins, primarily alphaâ1âacid glycoprotein. at much higher plasma concentrations (1 to 4 mcg/ml of free base), the plasma protein binding of lidocaine is concentration dependent. lidocaine crosses the placental and blood brain barriers, presumably by passive diffusion. metabolism it is not known if lidocaine is metabolized in the skin. lidocaine is metabolized rapidly by the liver to a number of metabolites, including monoethylglycinexylidide (megx) and glycinexylidide (gx), both of which have pharmacologic activity similar to, but less potent than that of lidocaine. a minor metabolite, 2, 6-xylidine, has unknown pharmacologic activity but is carcinogenic in rats. the blood concentration of this metabolite is negligible following application of lidocaine patch 5%. following intravenous administration, megx and gx concentrations in serum range from 11 to 36% and from 5 to 11% of lidocaine concentrations, respectively. excretion lidocaine and its metabolites are excreted by the kidneys. less than 10% of lidocaine is excreted unchanged. the half-life of lidocaine elimination from the plasma following iv administration is 81 to 149 minutes (mean 107 ± 22 sd, n = 15). the systemic clearance is 0.33 to 0.90 l/min (mean 0.64 ± 0.18 sd, n = 15).
Carcinogenesis and Mutagenesis and Impairment of Fertility:
Carcinogenesis, mutagenesis, impairment of fertility carcinogenesis a minor metabolite, 2, 6-xylidine, has been found to be carcinogenic in rats. the blood concentration of this metabolite is negligible following application of lidocaine patch 5%. mutagenesis lidocaine hcl is not mutagenic in salmonella/mammalian microsome test nor clastogenic in chromosome aberration assay with human lymphocytes and mouse micronucleus test. impairment of fertility the effect of lidocaine patch 5% on fertility has not been studied.
Clinical Studies:
Clinical studies single-dose treatment with lidocaine patch 5% was compared to treatment with vehicle patch (without lidocaine), and to no treatment (observation only) in a doubleâblind, crossover clinical trial with 35 postâherpetic neuralgia patients. pain intensity and pain relief scores were evaluated periodically for 12 hours. lidocaine patch 5% performed statistically better than vehicle patch in terms of pain intensity from 4 to 12 hours. multiple-dose, two-week treatment with lidocaine patch 5% was compared to vehicle patch (without lidocaine) in a double-blind, crossover clinical trial of withdrawal-type design conducted in 32 patients, who were considered as responders to the open-label use of lidocaine patch 5% prior to the study. the constant type of pain was evaluated but not the pain induced by sensory stimuli (dysesthesia). statistically significant differences favoring lidocaine patch 5% were observed in terms of time to exit from the trial (14 versus 3.8 days
Read more... at p-value <0.001), daily average pain relief, and patientâs preference of treatment. about half of the patients also took oral medication commonly used in the treatment of post-herpetic neuralgia. the extent of use of concomitant medication was similar in the two treatment groups.
How Supplied:
How supplied ndc: 71335-1934-5: 1 g in pouch / 14 patches in a carton ndc: 71335-1934-1: 1 g in pouch / 30 patches in a carton ndc: 71335-1934-2: 1 g in pouch / 3 patches in a carton ndc: 71335-1934-3: 1 g in pouch / 9 patches in a carton ndc: 71335-1934-4: 1 g in pouch / 10 patches in a carton
Information for Patients:
Information for patients methemoglobinemia 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.
Package Label Principal Display Panel:
Lidocaine patch 5% patches label