Permethrin

# Disclaimer
WikiDoc MAKES NO GUARANTEE OF VALIDITY. WikiDoc is not a professional health care provider, nor is it a suitable replacement for a licensed healthcare provider.  WikiDoc is intended to be an educational tool, not a tool for any form of healthcare delivery.  The educational content on WikiDoc drug pages is based upon the FDA package insert, National Library of Medicine content and practice guidelines / consensus statements.  WikiDoc does not promote the administration of any medication or device that is not consistent with its labeling. Please read our full disclaimer here.

# Overview
Permethrin is a dermatological agent that is FDA approved for the treatment of scabies, pediculosis capitis.   Common adverse reactions include pruritus, erythema, numbness, tingling, rash, headache, fever, dizziness, abdominal pain, diarrhea, nausea and vomiting.

# Adult Indications and Dosage

## FDA-Labeled Indications and Dosage (Adult)

# Indications
- Permethrin 5% Cream is indicated for the treatment of scabies caused by Sarcoptes scabiei

# Dosage
- Thoroughly massage Permethrin 5% Cream into the skin from the head to the soles of the feet. Scabies rarely infests the scalp of adults, although the hairline, neck, temple, and forehead may be infested in infants and geriatric patients. Usually 30 grams is sufficient for an average adult. The cream should be removed by washing (shower or bath) after 8 to 14 hours. Infants should be treated on the scalp, temple, and forehead. ONE APPLICATION IS GENERALLY CURATIVE.
- Patients may experience persistent pruritus after treatment. This is rarely a sign of treatment failure and is not an indication for retreatment. Demonstrable living mites after 14 days indicate that retreatment is necessary.

## Off-Label Use and Dosage (Adult)

### Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Permethrin in adult patients.

### NonGuideline-Supported Use

# Indications and Dosing
- Pediculosis capitis: apply to damp hair that has just been shampooed with a non conditioning shampoo; saturate hair and scalp beginning behind the ears and at back of neck; leave on 10 minutes; rinse with warm water; remove nits with nit comb; repeat application if live lice present 7 days after initial treatment.
- Scabies: apply a generous amount of cream from head to feet, leave on for 8 to 14 hours, wash with soap/water, repeat application if living mites present 14 days after initial treatment.

# Pediatric Indications and Dosage

## FDA-Labeled Indications and Dosage (Pediatric)

# Indications
- Permethrin 5% Cream is indicated for the treatment of scabies caused by Sarcoptes scabiei.

# Dosing
- Safety and efficacy have not been established in pediatric patients 2 months or younger.
- Thoroughly massage Permethrin 5% Cream into the skin from the head to the soles of the feet. Scabies rarely infests the scalp of adults, although the hairline, neck, temple, and forehead may be infested in infants patients. The cream should be removed by washing (shower or bath) after 8 to 14 hours. Infants should be treated on the scalp, temple, and forehead. ONE APPLICATION IS GENERALLY CURATIVE.
- Patients may experience persistent pruritus after treatment. This is rarely a sign of treatment failure and is not an indication for retreatment. Demonstrable living mites after 14 days indicate that retreatment is necessary.

## Off-Label Use and Dosage (Pediatric)

### Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Permethrin in pediatric patients.

### NonGuideline-Supported Use

# Indications and Dosage
- Safety and efficacy have not been established in pediatric patients 2 months or younger.
- Pediculosis capitis: apply to damp hair that has just been shampooed with a non conditioning shampoo; saturate hair and scalp beginning behind the ears and at back of neck; leave on 10 minutes; rinse with warm water; remove nits with nit comb; repeat application if live lice present 7 days after initial treatment.
- Scabies: apply a generous amount of cream from head to feet, leave on for 8 to 14 hours, wash with soap/water, repeat application if living mites present 14 days after initial treatment.

# Contraindications
- Permethrin 5% Cream is contraindicated in patients with known hypersensitivity to any of its components, to any synthetic pyrethroid or pyrethrin.

# Warnings
There is limited information regarding Warnings of Permethrin in patients.

# Adverse Reactions

## Clinical Trials Experience
- In clinical trials, generally mild and transient burning and stinging followed application with permethrin 5% Cream in 10% of patients and was associated with the severity of infestation. Pruritus was reported in 7% of patients at various times post-application. Erythema, numbness, tingling, and rash were reported in 1 to 2% or less of patients.

## Postmarketing Experience
- Other adverse events reported since marketing Permethrin 5% Cream include: headache, fever, dizziness, abdominal pain, diarrhea and nausea and/or vomiting. Although extremely uncommon and not expected when used as directed , rare occurrences of seizure have been reported. None have been medically confirmed as associated with PermethrinTM treatment.

# Drug Interactions
There is limited information regarding Drug Interactions of Permethrin in patients.

# Use in Specific Populations

### Pregnancy
Pregnancy Category (FDA): 
There is no FDA guidance on usage of Permethrin in women who are pregnant.
Pregnancy Category (AUS): 
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Permethrin in women who are pregnant.

### Labor and Delivery
There is no FDA guidance on use of Permethrin during labor and delivery.

### Nursing Mothers
There is no FDA guidance on the use of Permethrin in women who are nursing.

### Pediatric Use
There is no FDA guidance on the use of Permethrin in pediatric settings.

### Geriatic Use
There is no FDA guidance on the use of Permethrin in geriatric settings.

### Gender
There is no FDA guidance on the use of Permethrin with respect to specific gender populations.

### Race
There is no FDA guidance on the use of Permethrin with respect to specific racial populations.

### Renal Impairment
There is no FDA guidance on the use of Permethrin in patients with renal impairment.

### Hepatic Impairment
There is no FDA guidance on the use of Permethrin in patients with hepatic impairment.

### Females of Reproductive Potential and Males
There is no FDA guidance on the use of Permethrin in women of reproductive potentials and males.

### Immunocompromised Patients
There is no FDA guidance one the use of Permethrin in patients who are immunocompromised.

### Others

# Administration and Monitoring

### Administration
Topical
- Shake bottle well prior to use.
- Do not use near eyes, inside the nose, mouth, or vagina; protect eyes with a washcloth or towel during application.
- (Permethrin 1%) apply to damp hair that has just been shampooed with a nonconditioning shampoo; saturate hair and scalp beginning behind the ears and at back of neck; leave on 10 minutes; rinse with warm water; remove nits with nit comb;
- Repeat application if live lice present 7 days after initial treatment.
- (Permethrin 1%) do not rewash hair for 1 to 2 days after treatment.
- (Permethrin 5% cream) apply a generous amount of cream from head to feet, leave on for 8 to 14 hours, wash with soap/water, repeat application if living mites present 14 days after initial treatment.

### Monitoring
- Presence of lice

# IV Compatibility
There is limited information regarding the compatibility of Permethrin and IV administrations.

# Overdosage
- No instance of accidental ingestion of PermethrinTM (permethrin) 5% Cream has been reported. If ingested, gastric lavage and general supportive measures should be employed. Excessive topical use may result in increased irritation and erythema.

# Pharmacology

## Mechanism of Action
- It acts on the nerve cell membrane to disrupt the sodium channel current by which the polarization of the membrane is regulated. Delayed repolarization and paralysis of the pests are the consequences of this disturbance.
- Permethrin is rapidly metabolized by ester hydrolysis to inactive metabolites which are excreted primarily in the urine. Although the amount of permethrin absorbed after a single application of the 5% cream has not been determined precisely, data from studies with 14C-labeled permethrin and absorption studies of the cream applied to patients with moderate to severe scabies indicate it is 2% or less of the amount applied.

## Structure
- PermethrinTM (permethrin) 5% Cream is a topical scabicidal agent for the treatment of infestation with Sarcoptesscabiei (scabies). It is available in an off-white, vanishing cream base. PermethrinTM (permethrin) 5% Cream is for topical use only.
Chemical Name - The permethrin used is an approximate 1:3 mixture of the cis and trans isomers of the pyrethroid 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid, (3-phenoxyphenyl) methyl ester. Permethrin has a molecular formula of C21H20Cl2O3 and a molecular weight of 391.29. It is a yellow to light orange-brown, low melting solid or viscous liquid.
Active Ingredient - Each gram contains permethrin 50 mg (5%).
Inactive Ingredients - Butylated hydroxytoluene, carbomer homopolymer type B, fractionated coconut oil, glycerin, glyceryl monostearate, isopropyl myristate, lanolin alcohols, mineral oil, polyoxyethylene cetyl ethers, purified water, and sodium hydroxide. Formaldehyde 1 mg (0.1%) is added as a preservative.

## Pharmacodynamics
There is limited information regarding Permethrin Pharmacodynamics in the drug label.

## Pharmacokinetics
Absorption
Topical: 2% or less absorbed.
Excretion
Topical: Renal.

## Nonclinical Toxicology
There is limited information regarding Permethrin Nonclinical Toxicology in the drug label.

# Clinical Studies
There is limited information regarding Permethrin Clinical Studies in the drug label.

# How Supplied
PermethrinTM 5% Cream is available as follows:
60 g tube (NDC 40076-115-60)

## Storage
- Store at 20-25C (68-77F) .

# Images

## Drug Images

## Package and Label Display Panel

# Patient Counseling Information
There is limited information regarding Permethrin Patient Counseling Information in the drug label.

# Precautions with Alcohol
Alcohol-Permethrin interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

# Brand Names
PermethrinTM

# Look-Alike Drug Names
There is limited information regarding Permethrin Look-Alike Drug Names in the drug label.

# Drug Shortage Status
Drug Shortage

# Price