Description

First-Line Treatment for Scabies

Permethrin Cream 5% Overview

Permethrin Cream 5% is a topical antiparasitic medicine used as a first-line treatment for scabies, a contagious skin infestation caused by mites. It works by killing the mites responsible for scabies and their eggs, helping to relieve intense itching, rash, and skin irritation.

In the UK, permethrin 5% cream is classified as a pharmacy medicine and can be supplied following assessment by a pharmacist. It is intended for short-term use and must be applied correctly to ensure effective treatment.

Understanding Scabies

What is scabies?

Scabies is a parasitic skin infestation caused by the mite Sarcoptes scabiei. The mites burrow into the upper layers of the skin, where they lay eggs. This triggers an allergic reaction, leading to itching and rash.

Scabies spreads easily through:

• prolonged skin-to-skin contact
• close household or sexual contact
• sharing bedding or clothing in some cases

It can affect people of any age and is not related to hygiene.

Symptoms of scabies

Scabies commonly causes:

• intense itching, often worse at night
• a red, spotty rash
• thin burrow lines in the skin
• irritation between fingers, on wrists, elbows, waist, groin, buttocks, or feet

In infants and young children, the scalp, face, palms, and soles may also be affected.

What Is Permethrin Cream 5%?

Permethrin Cream 5% contains permethrin, a synthetic pyrethroid insecticide used widely in dermatology to treat parasitic skin conditions.

UK clinical guidance recommends permethrin 5% as the treatment of choice for scabies due to its high effectiveness and good safety profile when used as directed.

The cream is applied to the skin and washed off after a set period to kill mites on contact.

How Does Permethrin Cream 5% Work?

Mechanism of action

Permethrin works by:

• disrupting the nervous system of mites
• causing paralysis and death of the parasite
• preventing mites from feeding or reproducing

It is effective against adult mites and their eggs, which is essential for successful treatment.

Why correct application is essential

Treatment failure is most often caused by:

• missing areas of skin
• washing the cream off too soon
• failing to treat close contacts at the same time

Careful application is critical to prevent reinfestation.

What Permethrin Treats — and What It Does Not

What it treats

Permethrin Cream 5% is used to treat:

• scabies infestation
• mite-related skin irritation

What it does not treat

Permethrin does not:

• treat eczema or allergic skin conditions
• relieve itching immediately after treatment
• treat bacterial or fungal skin infections

Itching can persist for several weeks after successful treatment due to ongoing allergic reaction to dead mites.

Who Is Permethrin Cream 5% For?

Permethrin Cream 5% may be suitable for:

• adults and children aged 2 months and over
• individuals with suspected or diagnosed scabies
• those advised by a pharmacist or healthcare professional

All household members and close contacts should be treated at the same time, even if they have no symptoms.

Who Should Avoid Permethrin Cream 5%

Permethrin Cream 5% may not be suitable if:

• you are allergic to permethrin or pyrethroids
• the patient is under 2 months of age
• you have severely broken or infected skin (unless advised)

If you have chronic skin conditions such as eczema, seek advice before use.

How to Use Permethrin Cream 5%

Application instructions

For effective treatment:

• apply the cream to clean, dry skin
• cover the entire body from the neck down
• include fingers, toes, nails, soles, and skin folds

In infants and older adults, the scalp, face, neck, and ears may also need treatment, avoiding the eyes and mouth.

Leave the cream on for 8–12 hours, then wash off thoroughly. A second application after 7 days is often recommended.

Treating Close Contacts and the Environment

To reduce reinfestation risk:

• treat all household members simultaneously
• wash bedding, towels, and clothing at 60°C
• seal non-washable items in a bag for at least 72 hours

These steps are an essential part of treatment.

Safety, Warnings and Side Effects

Common side effects

Some people experience:

• mild burning or stinging
• redness or irritation at the application site
• temporary worsening of itching

These effects are usually short-lived.

Important safety advice

• for external use only
• avoid contact with eyes and mouth
• do not apply more frequently than directed

When to Seek Medical Advice

Speak to a GP or pharmacist if:

• symptoms persist beyond 4 weeks
• new burrows or rash continue to appear
• severe skin irritation develops
• scabies affects a baby under 2 months
• crusted (Norwegian) scabies is suspected

Further assessment or alternative treatment may be required.

Use in Pregnancy and Breastfeeding

Permethrin is generally considered safe for use during pregnancy and breastfeeding, but should only be used following advice from a pharmacist or GP.

How Permethrin Compares to Other Scabies Treatments

Permethrin vs oral ivermectin

Permethrin is the preferred topical first-line treatment. Oral ivermectin may be used in resistant or severe cases, usually under specialist supervision.

Permethrin vs older topical treatments

Permethrin is favoured due to its:

• higher effectiveness
• better tolerability
• lower toxicity

Supporting Skin Recovery After Scabies

After treatment:

• itching may continue for several weeks
• soothing emollients may help
• mild topical steroids may be advised for inflammation

Post-scabies itch does not usually indicate treatment failure.

Permethrin Cream 5% Summary

Permethrin Cream 5% is a highly effective first-line treatment for scabies when applied correctly. Successful treatment depends on careful application, repeat dosing where advised, and treating close contacts at the same time.

Persistent or worsening symptoms should always be medically assessed.