MIMS Revision Date: 01 November 2025

1 Name of Medicine

Lidocaine and prilocaine.

2 Qualitative and Quantitative Composition

Numit contains lidocaine 2.5% w/w (25 mg/g) and prilocaine 2.5% w/w (25 mg/g).
For the full list of excipients, see Section 6.1 List of Excipients.

3 Pharmaceutical Form

Numit is a soft, white cream for topical application.
Numit is non-sterile.

4 Clinical Particulars

4.1 Therapeutic Indications

Numit is indicated for topical anaesthesia of the skin prior to insertion of IV catheters, mechanical cleansing or debridement of leg ulcers, cleaning ulcers, blood sampling, vaccination; superficial surgical procedures, including split skin grafting, minor surgical cosmetic procedures. Topical anaesthesia of genital skin prior to superficial surgical procedures or infiltration anaesthesia.

4.2 Dose and Method of Administration

In order to avoid cross contamination, infection control procedures and principles should be strictly adhered to during application of Numit.
Pharmacokinetic data for application longer than 4 hours is not available in children. In adults, there is no benefit in application times longer than 5 hours, as the analgesic effectiveness of the cream dissipates over time.
Use in elderly. No dosage adjustment is required when Numit is applied to intact skin in the elderly.
Use in premature infants with a gestational age of less than 37 weeks is not recommended (see Section 4.4 Special Warnings and Precautions for Use).
Unscrew tube cap and peel off security seal. When used on leg ulcers discard the tube with any remaining Numit after each occasion that a patient is treated.
A 1 g dose of Numit cream is achieved by squeezing Numit from the tube into a circular area with diameter of approximately 20 mm (the size of a 2 dollar coin) to a depth of approximately 4 mm. Keep the tube in close contact with the skin until the correct amount has been applied.
A 1 g dose of Numit cream can also be achieved by squeezing a length of Numit of approximately 3.5 cm from the tube.
See Table 1 for dosing instructions.

4.3 Contraindications

Hypersensitivity to prilocaine, lidocaine or any local anaesthetics of the amide type.
Hypersensitivity to any of the excipients of Numit cream.
Glucose-6-phosphate dehydrogenase deficiency or congenital or idiopathic methaemoglobinaemia.

4.4 Special Warnings and Precautions for Use

Open wounds. Numit should not be applied to open wounds other than leg ulcers, due to insufficient data on absorption from these sites.
Atopic dermatitis. Care should be taken when applying Numit to skin areas with atopic dermatitis. A shorter application time (15-30 minutes) may be sufficient.
Eyes. Numit should not be applied to or near to the eyes since it causes corneal irritation. Damage to the eye may also occur from undetected foreign bodies. Special care should be employed to reduce the risk of rubbing the eyes with Numit. It is therefore important that the patch or occlusive dressing should be secured against accidental dislocation, especially in young children.
Middle ear. Lidocaine/prilocaine 5% cream is not recommended in any clinical situation in which its penetration into the middle ear is possible. In studies in rodents (guinea pigs) lidocaine/prilocaine 5% cream was found to have an ototoxic effect when instilled directly into the middle ear, however no abnormalities were observed when lidocaine/prilocaine 5% cream was applied to the animals' external auditory canal.
Lidocaine/prilocaine 5% cream caused minor structural damage to the tympanic membrane in rats when applied directly to the membrane. The relevance of these findings to the clinical situation is unknown.
Genital mucosa. Lidocaine/prilocaine 5% cream is presently not recommended for use on genital mucosa. Available data suggest that the anaesthetic efficacy of Numit on genital mucosa may be variable.
Vaccination. Lidocaine and prilocaine have bactericidal and antiviral properties in concentrations above 0.5-2%. A clinical trial with MMR vaccine administered subcutaneously demonstrated that lidocaine/prilocaine 5% cream does not adversely affect antibody response.
There are no data on effects of Numit on other live viral vaccines administered subcutaneously. When lidocaine/prilocaine 5% cream is used prior to intradermal BCG vaccination, the results of vaccination should be monitored.
Use in the elderly. No data available.
Paediatric use. Until further clinical data are available, lidocaine/prilocaine 5% cream should not be used in infants between 0 and 12 months of age receiving treatment with methaemoglobin inducing agents such as sulphonamides (also see Section 4.9 Overdose) or in preterm infants with a gestational age less than 37 weeks.
Studies have been unable to demonstrate the efficacy of lidocaine/prilocaine 5% cream for heel lancing in neonates.
Lidocaine/prilocaine 5% cream should not be applied to the genital mucosa of children owing to insufficient data on absorption. However, when used in neonates for circumcision (genital skin), a dose of 1.0 g lidocaine/prilocaine 5% cream on the prepuce has proven to be safe.
In children/ neonates younger than 3 months of age, a transient increase in methaemoglobin is commonly observed up to 12 hours after an application of lidocaine/prilocaine 5% cream.
Caution is required in those at risk of methaemoglobinaemia. Repeated applications of lidocaine/prilocaine 5% cream in neonates and infants have not been studied and should be avoided.
Use in premature infants with a gestational age of less than 37 weeks is not recommended.
Effects on laboratory tests. No data available.

4.5 Interactions with Other Medicines and Other Forms of Interactions

Antiarrhythmic drugs class III. Patients treated with antiarrhythmic drugs class III (e.g. amiodarone) should be kept under close surveillance and ECG monitoring considered, since cardiac effects may be additive.
Specific interaction studies with lidocaine and antiarrhythmic drugs class III (e.g. amiodarone) have not been performed, but caution is advised.
Drugs reducing clearance of lidocaine. Drugs that reduce the clearance of lidocaine (for example, cimetidine or beta-blockers) may cause potentially toxic plasma concentrations when lidocaine (e.g. Numit) is given in repeated high doses over a long time period. Such interactions should therefore be of no clinical importance following short-term treatment with lidocaine (e.g. Numit) at recommended doses.
Methaemoglobinaemia inducing agents. Numit may accentuate the formation of methaemoglobin in patients treated with other drugs known to induce methaemoglobinaemia (e.g. sulphonamides).
Other local anaesthetic agents. With large doses of Numit, the risk of additional systemic toxicity should be considered in patients receiving other local anaesthetics or agents structurally related to local anaesthetics, e.g. mexiletine.
Drugs reducing clearance of lidocaine. Drugs that reduce the clearance of lidocaine (for example cimetidine or beta-blockers) may cause potentially toxic plasma concentrations when lidocaine (e.g. Numit) is given in repeated doses over a long time period. Such interactions should therefore be of no clinical importance following short-term treatment with lidocaine (e.g. Numit) at recommended doses.

4.6 Fertility, Pregnancy and Lactation

Effects on fertility. No data available.
Use in pregnancy. (Category A)
Category A: Drugs which have been taken by a large number of pregnant women and women of child bearing age without any proven increase in the frequency of malformations or other direct or indirect harmful effects on the foetus having been observed.
Use in lactation. No information is available on the excretion of lidocaine, prilocaine or their metabolites into breast milk following the administration of Numit.
Following parenteral administration, lidocaine is excreted into breast milk. Because of low maternal systemic absorption following application of recommended doses of Numit, the amount of lidocaine and prilocaine that may be ingested by the breastfed infant would be extremely small.

4.7 Effects on Ability to Drive and Use Machines

The effects of this medicine on a person's ability to drive and use machines were not assessed as part of its registration.

4.8 Adverse Effects (Undesirable Effects)

Intact skin. Common events (≥ 1% and < 10%). Skin. Transient local reactions at the application site such as, paleness, erythema (redness) and oedema.
Uncommon events (≥ 0.1% and < 1%). Skin sensations (an initial mild burning sensation, itch or warmth at the application site).
Rare events (< 0.1%). General. In rare cases, local anaesthetic preparations have been associated with allergic reactions (in the most severe instances anaphylactic shock).
Rare cases of discrete local lesions at the application site, described a purpuric or petechial, have been reported, especially after longer application times in children with atopic dermatitis or mollusca contagiosa. Increased methaemoglobin level. Methaemoglobinaemia and/or cyanosis. Corneal irritation after accidental eye exposure.
Leg ulcer. Common events (≥ 1% and < 10%). Skin. Transient local reactions at the application site such as, paleness, erythema (redness) and oedema.
Skin sensations (an initial mild burning sensation, itch or warmth at the application site).
Uncommon events (≥ 0.1% and < 1%). Skin. Skin irritation (at the application site).
Rare events (< 0.1%). General. In rare cases, local anaesthetic preparations have been associated with allergic reactions (in most severe instances anaphylactic shock).
Reporting suspected adverse effects. Reporting suspected adverse reactions after registration of the medicinal product is important. It allows continued monitoring of the benefit-risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions at www.tga.gov.au/reporting-problems.

4.9 Overdose

Rare cases of methaemoglobinaemia have been reported.
Prilocaine in high doses may cause an increase in the methaemoglobin level particularly in conjunction with methaemoglobinaemia inducing agents (e.g. sulphonamides). Clinically significant methaemoglobinaemia should be treated with a slow intravenous injection of methylene blue.
In the unlikely event of systemic toxicity following epidermal application of Numit, the signs and symptoms anticipated would be similar in nature to those observed following other routes of administration of local anaesthetics. Owing to slow absorption into the circulation from intact skin, a patient with signs of toxicity should be observed for several hours after treatment.
Systemic toxicity to amide type local anaesthetics is initially manifested as CNS excitation and may result in a slow onset of nervousness, dizziness, blurred vision and tremors followed by drowsiness, convulsions, unconsciousness and possibly respiratory arrest.
Toxic cardiovascular reactions to local anaesthetics are usually depressant in nature, may occur rapidly and with little warning and can lead to peripheral vasodilation, hypotension, myocardial depression, bradycardia and possible cardiac arrest. Severe neurological symptoms (convulsions, CNS depression) must be treated symptomatically by respiratory support and administration of anticonvulsive drugs.
For information on the management of overdose, contact the Poisons Information Centre on 131126 (Australia).

5 Pharmacological Properties

5.1 Pharmacodynamic Properties

Mechanism of action. Lidocaine and prilocaine are both amide type local anaesthetic agents. Both agents stabilise the neuronal membrane preventing the initiation and conduction of nerve impulses thereby effecting local anaesthetic action.
Numit provides dermal anaesthesia. The depth and quality of anaesthesia depends upon the application time and the applied dose.
Local anaesthesia with Numit is achieved after 60 minutes application. Numit cream should be applied under an occlusive, impermeable dressing. Following the application of Numit cream for 1-2 hours, the duration of anaesthesia is at least 2 hours after removal of the occlusive dressing.
Reliable anaesthesia for the cleansing of leg ulcers is achieved after an application time of 30 minutes in most patients. An application time of 60 minutes may improve the anaesthesia. The cleansing procedure should start within 10 minutes of removal of the cream. There is no clinical data regarding cleaning started after 10 minutes of cream removal.
A reduced number of cleansing sessions are required to achieve a clean ulcer when Numit is used compared to a placebo.
No negative effects on ulcer healing or bacterial flora have been observed.
Numit may cause transient local peripheral vasoconstriction or vasodilation, observed as transient paleness or redness, at the treated area.
Clinical trials. In clinical trials with lidocaine/prilocaine 5% cream, venepuncture or venous catheterisation was pain free in 50-59% patients, slightly painful in 35-40% and painful in 3-6%. Anaesthesia may be less for skin structures below the deep fascia.
In clinical trials in adults assessing pain associated with intramuscular influenza vaccination and intramuscular and subcutaneous injections of saline solution, lidocaine/prilocaine 5% cream significantly reduced injection pain relative to placebo.
In clinical trials in infants and children assessing pain associated with subcutaneous and intramuscular vaccination, lidocaine/prilocaine 5% cream significantly reduced injection pain behaviours and pain scores relative to placebo.
In clinical trials assessing the effects of lidocaine/prilocaine 5% cream on intramuscular and subcutaneous, live and nonlive vaccines, it was demonstrated that lidocaine/prilocaine 5% cream does not adversely affect antibody response. A clinical trial assessing the effect of lidocaine/prilocaine 5% cream application prior to intracutaneous BCG injection demonstrated that lidocaine/prilocaine 5% cream did not affect the immunisation response.

5.2 Pharmacokinetic Properties

Absorption. Systemic absorption and anaesthetic efficacy of lidocaine and prilocaine is dependent upon the characteristics of the leg ulcer, the applied dose, total application area, application time, thickness of the skin (which varies between different areas of the body), other conditions such as skin diseases, and shaving.
Intact skin. The extent of systemic absorption was approximately 10% following application to the face (10 g/100 cm² for 2 hours). Maximum plasma levels (mean 0.16 and 0.06 microgram/mL of lidocaine and prilocaine respectively) were reached after approximately 2.5 hours.
After application to the thigh in adults (60 g cream/400 cm² for 3 hours) the extent of absorption was approximately 5% of lidocaine and prilocaine. Maximum plasma concentrations (mean 0.12 and 0.07 microgram/mL) were reached approximately 2-6 hours after the application.
In adults, a thick layer of lidocaine/prilocaine 5% cream (corresponding to approximately 150 g) has been applied to intact skin areas of up to 1,300 cm² for application times of up to 7 hours. The highest individual plasma levels observed to date were 1.1 microgram/mL lidocaine and 0.2 microgram/mL prilocaine. These levels were below those at which symptoms of toxicity would be expected to occur (5-10 microgram/mL either agent; also see Section 4.8 Adverse Effects (Undesirable Effects)).
Leg ulcers. Following a single application for 30 minutes of 5 to 10 g of lidocaine/prilocaine 5% cream to leg ulcers, the maximum plasma levels of lidocaine (range 0.05-0.25 microgram/mL, one individual value of 0.84 microgram/mL) and of prilocaine (0.02-0.08 microgram/mL) were reached within 1-2.5 hours.
After an application time of 24 hours the maximum plasma levels of lidocaine (0.19-0.71 microgram/mL) and of prilocaine (0.06-0.28 microgram/mL) were usually reached within 2-4 hours.
Following repeated applications for 30-60 minutes of 2-10 g lidocaine/prilocaine 5% cream 3-7 times a week, for up to 15 doses, during a period of one month, there was no apparent accumulation in plasma of lidocaine and its metabolites monoglycinexylidide and 2,6-xylidine or of prilocaine and its metabolite orthotoluidine. The maximum observed plasma levels for lidocaine, monoglycinexylidide and 2,6-xylidine were 0.41, 0.03 and 0.01 microgram/mL respectively. The maximum observed plasma levels for prilocaine and orthotoluidine were 0.08 microgram/mL and 0.01 microgram/mL respectively.
Children. Following the application of 1.0 g of lidocaine/prilocaine 5% cream in neonates below 3 months of age, to approximately 10 cm² for one hour, the maximum plasma concentration of lidocaine and prilocaine were 0.135 microgram/mL and 0.107 microgram/mL respectively.
Following the application of 2.0 g of lidocaine/prilocaine 5% cream in infants between 3 and 12 months of age, to approximately 16 cm² for four hours, the maximum plasma concentrations of lidocaine and prilocaine were 0.155 microgram/mL and 0.131 microgram/mL respectively.
Following the application of 10.0 g of lidocaine/prilocaine 5% cream in children between 2 and 3 years of age, to approximately 100 cm² for two hours, the maximum plasma concentrations of lidocaine and prilocaine were 0.315 microgram/mL and 0.215 microgram/mL respectively.
Following the application of 10.0-16.0 g of lidocaine/prilocaine 5% cream in children between 6 and 8 years of age, to approximately 100-160 cm² for two hours, the maximum plasma concentrations of lidocaine and prilocaine were 0.299 microgram/mL and 0.110 microgram/mL respectively.
Pharmacokinetic data for application longer than 4 hours is not available in children. In adults, there is no benefit in application times longer than 5 hours, as the analgesic effectiveness of the cream dissipates over time.

5.3 Preclinical Safety Data

Genotoxicity. Genotoxicity tests with lidocaine are inconclusive. In genotoxicity studies, a metabolite of lidocaine, 2,6-xylidine, showed evidence of activity in some tests but not in other tests.
Carcinogenicity. A metabolite of lidocaine, 2,6-xylidine has been shown to have carcinogenic potential (nasal and subcutaneous tumours) in preclinical toxicological studies evaluating chronic exposure. A metabolite of prilocaine, o-toluidine, has also shown evidence of mutagenic activity in some genotoxicity tests but not others. o-toluidine has also been shown to have carcinogenic potential (e.g. renal, bladder, spleen subcutaneous tumours) in preclinical toxicological studies.

6 Pharmaceutical Particulars

6.1 List of Excipients

Each gram of Numit cream contains ethoxylated hydrogenated castor oil, purified water, carbomer 934P and sodium hydroxide as excipients.

6.2 Incompatibilities

Incompatibilities were either not assessed or not identified as part of the registration of this medicine.

6.3 Shelf Life

In Australia, information on the shelf life can be found on the public summary of the Australian Register of Therapeutic Goods (ARTG). The expiry date can be found on the packaging.

6.4 Special Precautions for Storage

Store below 30°C.

6.5 Nature and Contents of Container

5 g laminate tube*, 10 g laminate tube and 30 g laminate tube, packed into a carton.
*Not currently marketed in Australia.

6.6 Special Precautions for Disposal

In Australia, any unused medicine or waste material should be disposed of by taking to your local pharmacy.

6.7 Physicochemical Properties

Numit cream is a 1:1 oil/water emulsion of an eutectic mixture of lidocaine and prilocaine.
When lidocaine and prilocaine are mixed in equal amounts, the solid pure bases of lidocaine and prilocaine form an oil at temperatures above 16°C (i.e. a eutectic mixture). By avoiding the need for nonaqueous solvent, higher concentrations of local anaesthetic in the cream can be achieved and maintained during application.
Lidocaine. Molecular formula: C₁₄H₂₂N₂O. Molecular weight: 234.3.
Prilocaine. Molecular formula: C₁₃H₂₀N₂O. Molecular weight: 220.3.
Chemical structure.

CAS number. 137-58-6, 721-50-6.

7 Medicine Schedule (Poisons Standard)

S2 (Pharmacy Medicine).

Date of First Approval

01 December 2015

Date of Revision

07 April 2025

Summary Table of Changes