The FDA has approved spinosad 0.9% suspension (Natroba – ParaPro) for topical treatment of head lice infestation in patients ≥4 years old. It is available only by prescription.

Topical ivermectin lotion 0.5% (Sklice, and generics), which has been available by prescription since 2012, is now FDA-approved for sale over the counter (OTC) for treatment of head lice in patients ≥6 months old. Ivermectin is also available by prescription as a 1% cream (Soolantra) approved for topical treatment of inflammatory lesions of rosacea and in oral tablets (Stromectol, and generics) for treatment of various parasitic infections.

The FDA has approved benzyl alcohol lotion, 5% (Ulesfia Lotion - Sciele) for treatment of head lice in patients ≥6 months old. The active ingredient is 5% benzyl alcohol; the vehicle is 5% mineral oil.

Pediculosis capitis (head lice infestations) occur in all age groups, but especially in elementary school children. In most cases, transmission occurs by head-to-head contact. Pharmacologic treatment is recommended for persons with live lice or eggs (nits) within 1 cm of the scalp. Topical pediculicides should be tried first. Oral therapy is occasionally required for refractory infestations.

The FDA has approved the antiparasitic drug ivermectin in a 0.5% lotion (Sklice – Sanofi Pasteur) as a single-use topical treatment for head lice in patients ≥6 months old. Oral ivermectin (Stromectol – Merck) is effective for treatment of head lice resistant to other therapies, but it has not been approved by the FDA for this indication.

With increasing travel, immigration, use of immunosuppressive drugs and the spread of AIDS, physicians anywhere may see infections caused by parasites. The table in this document lists first-choice and alternative drugs for most parasitic infections.