Pharmacokinetics of Malathion Gel 0.5% and Malathion 0.5% Lotion (Ovide) in Patients With Head Lice

A randomized, single-dose, parallel group, comparative PK study. Patients will be randomly assigned in 1:1 ratio to the study products. Twenty four (24) consenting patients, age 18 years and older, who meet Inclusion/Exclusion criteria will be enrolled in this study. 12 Patients will be treated with Malathion Gel, 0.5% and other 12 Patients will be treated with Ovide Lotion 0.5%. The study will be single centre and conducted only in India. The primary objective of this study is to compare the systemic exposure of Malathion 0.5% Gel manufactured by Taro Pharmaceuticals USA, Inc. to that of the OVIDE Lotion 0.5%, currently marketed by Taro Pharmaceutical USA, Inc., in adult Patients with head lice. The secondary objective is to determine the link between the exposure and cholinesterase activity.

Inclusion criteria

• Male or non-pregnant female
• Patients 18 years of age or older and healthy presenting with Pediculosis capitis
• The Patient must be willing to consent to the Patient's treatment with Malathion Gel 0.5% or Ovide Lotion 0.5% and for blood drawings before and after medication administration.

Exclusion criteria

• Individuals with history of irritation or sensitivity to pediculicides or hair care products
• Individuals with any visible skin/scalp condition at the treatment site which, in the opinion of the investigative personnel, or Sponsor, will interfere with the evaluation.
• Individuals previously treated with a pediculicide within 4 weeks of the study.
• Individuals who exhibit potential signs and symptoms of cholinesterase inhibition.
• Patients currently receiving sulfonamide antibiotics or ivermectin.