Final answer:
The medication that kills eggs in head lice is called a pediculicide, and common examples include permethrin and pyrethrin. These medications work by disrupting the nervous system of lice and their eggs, leading to their death.
Step-by-step explanation:
Pediculicides are specifically formulated to eliminate head lice, including both the adult lice and their eggs, known as nits. Permethrin and pyrethrin are synthetic and natural insecticides, respectively, and both are widely used for treating head lice infestations. These medications act on the nervous system of the lice, causing paralysis and death.
Permethrin, a synthetic pyrethroid, is available in various formulations, such as creams, lotions, or shampoos. It is applied to the hair and scalp and left for a specified duration before being rinsed off. Pyrethrin, derived from chrysanthemum flowers, is also used topically and works in a similar manner.
Crucially, these pediculicides not only target adult lice but also have ovicidal effects, meaning they kill the eggs. This dual action is vital for breaking the life cycle of head lice and preventing reinfestation. The medications are generally applied according to the instructions provided, ensuring thorough coverage and adherence to the recommended treatment regimen.
In summary, pediculicides like permethrin and pyrethrin are effective in killing both adult head lice and their eggs. Their mechanism of action on the nervous system ensures comprehensive treatment and is crucial for preventing the recurrence of head lice infestations.