Permethrin Cream: Treatment Guide for Scabies and Crab Lice
Complete guide to permethrin cream treatment for scabies and crab lice infestations.
Permethrin Cream: A Comprehensive Treatment Guide
Permethrin cream, commonly known by the brand name Lyclear, is an effective insecticide treatment used to eliminate parasitic infestations affecting the skin. This medication contains permethrin, a synthetic insecticide that belongs to a family of compounds called pyrethroids. The cream is specifically designed to treat two common parasitic conditions: scabies and crab (pubic) lice. Understanding how this medication works, how to use it correctly, and what to expect during treatment is essential for successful outcomes.
About Permethrin Cream
| Characteristic | Details |
|---|---|
| Type of Medicine | Insecticide |
| Used For | Treatment of scabies in adults and children; treatment of crab lice in adults |
| Brand Name | Lyclear Dermal Cream |
| Available Form | 5% Cream |
| Active Ingredient Concentration | 5% w/w permethrin |
Permethrin cream works by targeting the nervous systems of mites and lice, causing paralysis and death of both adult parasites and their eggs. The formulation is gentle enough for most skin types while remaining highly effective against parasitic infestations. The cream provides not only parasite elimination but also fast-acting relief from the intense itching and irritation associated with these conditions.
How Permethrin Cream Works
The active ingredient in permethrin cream is a synthetic insecticide belonging to the pyrethroid family. This compound works by interacting with the nervous systems of parasites, causing them to become paralyzed and subsequently destroyed. Permethrin acts immediately upon contact with mites, lice, and their eggs, eliminating the parasites and preventing the spread of infestation while simultaneously relieving associated symptoms.
When applied to the skin, permethrin penetrates the affected areas and targets the parasitic organisms directly. The medication is effective against the scabies mite, which burrows into the skin and causes intense itching, as well as crab lice, which infest the pubic hair region. By destroying both the adult parasites and their eggs, permethrin cream provides comprehensive treatment of the infestation.
Before Using Permethrin Cream
Before starting treatment with permethrin cream, it is crucial to ensure that this medication is appropriate for your specific situation. Your doctor or pharmacist should be aware of several important factors:
- Pregnancy and Breastfeeding: If you are pregnant or breastfeeding, you should only use permethrin cream on the recommendation of a doctor, as special precautions may be necessary during these sensitive periods.
- Age Considerations: Permethrin cream for scabies should only be used in children under 2 years of age on medical advice. For crab lice treatment, this medication is approved only for adults.
- Allergies and Sensitivities: Inform your healthcare provider if you have ever had an allergic reaction to a cream or ointment, or if you know you are allergic to chrysanthemums or other flowering plants known as Compositae, as permethrin is derived from compounds found in these plants.
- Existing Skin Conditions: Discuss any history of eczema or asthma, as the medication may temporarily aggravate these conditions in rare cases.
How to Use Permethrin Cream
Pre-Application Preparation
Before beginning treatment, carefully read the manufacturer’s printed information leaflet included in the packaging. This leaflet provides detailed application instructions and a comprehensive list of possible side effects. Proper preparation is essential for effective treatment:
- Do not bathe or shower immediately before applying the cream, as wet or warm skin reduces effectiveness.
- Allow your skin to cool and dry completely after bathing or showering before applying the cream.
- Remove all clothing and jewelry to ensure complete body coverage.
- Wash your hands before beginning the application process.
Application Instructions
Two applications of permethrin cream are necessary for complete treatment, with applications spaced one week apart. Each application requires careful attention to ensure all areas of the body are covered:
- Apply a thin, even layer of cream over your entire body, including your face, neck, scalp, and ears.
- Take special care to avoid getting cream into your eyes.
- Pay particular attention to difficult-to-reach areas such as your back, the soles of your feet, between your fingers and toes, under your fingernails, and your genitals.
- Ensure cream is applied to all skin creases and folds, including between breasts, under buttocks, and around the waist.
- If unable to remove a ring or other jewelry, move it to one side and treat the skin underneath.
Treatment Duration and Removal
The length of time you should leave the cream on your skin depends on the condition being treated:
- For Scabies: Leave the cream on for 8 to 12 hours.
- For Crab Lice: Leave the cream on for 12 hours, preferably overnight.
- After the appropriate time has passed, remove the treatment by bathing or showering with soap and water.
- If you need to wash your hands during the treatment period, remember to reapply cream to your hands afterward.
Second Treatment Application
Seven days after your first treatment, you must apply the cream a second time using the same technique as the initial application. This second treatment is crucial for ensuring that all mites, lice, and any newly hatched parasites are eliminated. Using two treatments spaced one week apart provides comprehensive elimination of the parasitic infestation.
Dosage Information
The amount of permethrin cream needed varies based on age:
- Adults: Require approximately 60 grams of cream total for both applications (typically two 30-gram tubes, one per application).
- Older Children: Require approximately 30 grams total for both applications (half a tube per application).
- Younger Children: Require approximately 15 grams total for both applications (one quarter of a tube per application).
Special Considerations for Breastfeeding
If you are breastfeeding a child, take special care to wash the cream off your nipples before feeding, then reapply the cream afterward. This precaution ensures your infant is not exposed to the medication while maintaining your treatment course.
How Long Does Permethrin Cream Take to Work?
Permethrin cream begins working immediately upon contact with parasites, killing mites and lice through its action on their nervous systems. Most people using Lyclear notice relief from itching within a few hours of application. However, it is important to understand that complete elimination of the infestation takes longer.
It may take up to fourteen days for your body to become completely free of mites and lice, including dead parasites. Itching may persist for up to four weeks after treatment, but this typically represents your skin’s inflammatory response to the presence of dead parasites rather than an indication of active infestation. If itching continues beyond four weeks, consult your healthcare provider.
Possible Side Effects of Permethrin Cream
While permethrin cream is generally well tolerated, like all medicines it can cause unwanted side effects in some individuals. Most side effects are mild and temporary, improving as your body adjusts to the medication. However, if any side effects persist or become troublesome, contact your doctor or pharmacist for advice.
| Side Effect | Description and Management |
|---|---|
| Skin Irritation | Mild irritation at the application site is common and usually resolves quickly. If irritation continues or worsens, seek medical advice. |
| Burning or Stinging | A mild burning or stinging sensation may occur during or after application. This typically subsides within a few hours. If severe, wash off the cream and contact your pharmacist. |
| Redness and Rash | Temporary redness and minor rashes may develop as your skin reacts to the medication or the parasite treatment. These usually resolve without intervention but may persist for several days. |
| Temporary Aggravation of Eczema or Asthma | In rare cases, permethrin cream may temporarily worsen existing eczema or asthma symptoms. Inform your doctor before use if you have these conditions. |
For a complete list of possible side effects, refer to the manufacturer’s information leaflet provided with your medication. Always consult your healthcare provider if you experience any concerning symptoms during or after treatment.
Safety Precautions and Warnings
- Eye Contact: Avoid contact with eyes and mucous membranes around the eyes, nose, and mouth, particularly when treating the face for crab lice.
- Flammability Warning: Because the cream formulation contains paraffin, avoid smoking or exposure to naked flames immediately after applying permethrin cream to your skin.
- Pregnancy and Breastfeeding: Consult your healthcare provider before using this product if you are pregnant or breastfeeding.
Frequently Asked Questions
Q: Can permethrin cream be used on the face?
A: Yes, permethrin cream can be applied to the face when treating crab lice, but take care to avoid contact with the eyes and mucous membranes around the eyes, nose, and mouth.
Q: What should I do if I miss the second application?
A: The second application seven days after the first is crucial for treatment success. Apply it as soon as you remember. Contact your pharmacist or doctor for specific guidance if the timing is significantly delayed.
Q: Can I use permethrin cream while pregnant?
A: Permethrin cream should only be used during pregnancy if specifically recommended by a doctor, as special considerations apply during pregnancy.
Q: How long should I wait before bathing after applying permethrin cream?
A: For scabies, wait 8-12 hours before bathing. For crab lice, wait 12 hours (overnight). After this time, bathe or shower normally with soap and water to remove the cream.
Q: Will my itching stop immediately after applying permethrin cream?
A: While relief from itching typically begins within a few hours, complete resolution may take up to four weeks as your skin recovers from the parasitic infestation.
Q: Can I use permethrin cream on children under 2 years old?
A: For scabies in children under 2 years, permethrin cream should only be used on the advice of a doctor. It is not recommended for treating crab lice in children, as crab lice in very young children is extremely rare.
Q: What if I have sensitive skin?
A: Permethrin cream is formulated to be gentle enough for most skin types. However, if you have known allergies to chrysanthemums or other Compositae flowering plants, inform your doctor before use. Perform a patch test if concerned about sensitivity.
Q: Are there any drug interactions with permethrin cream?
A: As a topical medication, permethrin cream has minimal systemic absorption and generally does not interact with oral medications. However, inform your doctor about all medications you are taking.
References
- Permethrin cream (Lyclear) — Patient.info. Last updated 14 Sept 2024. https://patient.info/medicine/permethrin-cream-lyclear
- Lyclear 5% Cream – Scabies & Crab Lice Treatment — The Independent Pharmacy. https://www.theindependentpharmacy.co.uk/scabies/lyclear-cream
- Permethrin Topical: MedlinePlus Drug Information — U.S. National Library of Medicine. https://medlineplus.gov/druginfo/meds/a698037.html
- Permethrin: Scabies Treatment & Side Effects — Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/19057-permethrin-skin-cream
- Permethrin (topical route) – Side effects & dosage — Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/permethrin-topical-route/description/drg-20065448
Similar Articles
Read full bio of Sneha Tete
