Acticin is a brand-name topical cream that contains permethrin as its active ingredient. It belongs to the skin-care and antiparasitic category of medicines and is supplied in a 30 g cream tube. In Hong Kong, Acticin is a prescription-only product regulated by the Hong Kong Department of Health under the Pharmacy and Poisons Ordinance. The medication is formulated for external use on the skin to treat infestations caused by mites and lice.
Permethrin is a synthetic pyrethroid that mimics the insecticidal activity of natural pyrethrins. When applied to the skin, it penetrates the outer layer of the parasite’s cuticle and interferes with the function of sodium channels in the parasite’s nerve membranes. This disruption leads to prolonged depolarization, paralysis, and ultimately death of the mite or louse. The effect is localized to the site of application; systemic absorption is minimal, which limits the risk of systemic toxicity.
Acticin (permethrin cream) is approved in Hong Kong for the topical treatment of:
These indications are supported by the product’s inclusion in the Hong Kong Department of Health’s list of approved antiparasitic agents. The medication is intended for use in adults and children over the age specified in the prescribing information (typically 2 years and older).
If any of these conditions apply, a healthcare professional should evaluate the suitability of Acticin on a case-by-case basis.
These reactions are typically transient and can be managed by washing the area with mild soap and water after the recommended exposure time.
If a serious reaction occurs, discontinue use and seek urgent care.
Permethrin applied topically has limited systemic absorption, so clinically significant drug-drug interactions are uncommon. Nevertheless:
Patients should inform their healthcare provider of all medicines, over-the-counter products, and herbal supplements before starting Acticin.
Only one treatment course is typically required for scabies; a repeat dose may be prescribed after 7 - 14 days if persistent lesions remain.
If the cream is not applied for the intended exposure period, reapply a fresh dose as soon as possible. Do not double the amount to compensate for a missed application.
Systemic overdose from topical permethrin is extremely rare. In the unlikely event of excessive application, symptoms may include generalized skin irritation, dizziness, or nausea. Seek medical attention promptly; supportive care is the mainstay of treatment.
Acticin does not require tapering. The cream can be stopped once the prescribed exposure time has been completed and the skin lesions have resolved.
Routine laboratory monitoring is not required for topical permethrin. Patients should:
This article provides educational information about Acticin and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.
Acticin is formulated specifically for parasitic infestations such as scabies and lice. It does not possess antifungal activity, so it is not recommended for fungal infections. Alternative antifungal agents should be considered for that purpose.
A 30 g tube is generally sufficient for one full-body application in an adult, covering the skin from the neck down. The amount needed may vary slightly with body size, but most adults complete treatment with a single tube.
The product label advises against applying the cream to the face, scalp (unless treating head lice), and genital regions because the skin there is more sensitive. For scalp lice, a separate scalp-specific preparation is typically used.
Mild itching can be a normal response, but severe or persistent itching may indicate an allergic reaction. Wash the area gently with mild soap, avoid scratching, and contact a healthcare professional promptly for evaluation.
Shaving the hair is not required. The cream can be applied to a dry scalp with hair present. The medication penetrates the hair shaft to reach lice attached to the hair strands.
Applying other topical products (e.g., moisturizers, sunscreen) before the permethrin cream may reduce its efficacy by creating a barrier. It is best to apply Acticin to clean, dry skin and avoid layering other creams until after the treatment period.
Permethrin remains the first-line treatment for scabies in Hong Kong and retains activity against most mite populations. However, resistance can emerge in rare cases; if treatment fails, a healthcare provider may consider alternative agents such as ivermectin.
Permethrin is minimally absorbed through the skin, and only trace amounts may be present in breast milk. Use is generally considered compatible with breastfeeding when clearly needed, but a professional assessment is advisable.
Do not flush the cream down the toilet. Seal the empty tube in a disposable bag and discard it with household waste, or follow any specific disposal instructions provided by your pharmacy.
When traveling in areas where scabies or lice are common, carry the prescribed amount of Acticin in its original packaging. Keep the cream sealed, protected from heat, and be aware of local regulations regarding prescription medications.
