What is the name of an ointment for pubic lice? - briefly
The standard topical treatment for pubic lice is a 1 % permethrin cream («Nix»). Apply to the affected area for ten minutes before washing off.
What is the name of an ointment for pubic lice? - in detail
The primary topical preparation approved for the treatment of pubic lice is a 1 % permethrin cream. Permethrin belongs to the pyrethroid class of insecticides; it disrupts the nervous system of the parasite, leading to rapid immobilization and death. The formulation is applied to the affected area, left in place for 10 minutes, then thoroughly rinsed. A single application usually eliminates the infestation, although a repeat dose after seven days may be recommended to address any newly hatched lice.
Alternative topical agents include:
- Pyrethrins with piperonyl butoxide (0.5 %–1 %) – a botanical insecticide combined with a synergist; applied similarly to permethrin, but resistance rates are higher.
- Malathion lotion (0.5 %) – an organophosphate that acts as an acetylcholinesterase inhibitor; effective against resistant strains but associated with higher irritation risk and limited availability in some regions.
- Lindane 1 % cream – an organochlorine insecticide; effective but largely withdrawn from the market due to neurotoxicity concerns and strict regulatory restrictions.
- Ivermectin 0.5 % cream – a macrocyclic lactone; emerging option with favorable safety profile, prescribed in select jurisdictions for cases unresponsive to pyrethroids.
Key considerations for topical therapy:
- Dosage and exposure – follow the manufacturer’s instructions; excess application does not improve efficacy and may increase skin irritation.
- Contact time – ensure the recommended duration (typically 10 minutes) before washing off; insufficient exposure reduces parasite mortality.
- Re‑treatment – a second application after a week addresses any lice that hatch from eggs missed during the initial treatment.
- Safety – most agents are well tolerated; common adverse effects include transient burning, itching, or erythema at the application site. Systemic absorption is minimal when used as directed.
- Prescription status – permethrin and ivermectin creams generally require a prescription; pyrethrin‑based lotions may be available over the counter in some countries, while lindane is restricted to specialist use.
Proper hygiene measures complement pharmacologic treatment: washing bedding, clothing, and towels in hot water (≥ 50 °C) and drying on high heat eliminates residual eggs. Close contacts should be examined and, if necessary, treated prophylactically to prevent reinfestation.