Lufenuron

Lufenuron is an insect development inhibitor (IDI) primarily used for the control of flea populations in dogs and cats. It is highly lipophilic and acts systemically after oral or subcutaneous administration. **Key Clinical Points:** - **Flea Control:** Highly effective at breaking the flea life cycle, but **does not kill adult fleas**. It is often combined with adulticides (e.g., nitenpyram, milbemycin) for comprehensive parasite control. - **Lag Period:** Because it only affects eggs and molting larvae, there is a lag period of 60-90 days before the environmental flea population is significantly reduced. - **Alternative Uses:** Historically proposed as an adjunctive treatment for dermatophytosis (fungal infections) and *Encephalitozoon cuniculi* in rabbits, though modern veterinary consensus considers its efficacy for these indications to be highly doubtful. - **Safety:** Exceptionally safe in mammals due to the lack of chitin in mammalian biology.

กลไกการออกฤทธิ์: Lufenuron acts by inhibiting **chitin synthesis, polymerization, and deposition** in insects. - **Mechanism:** It is believed to cause nonspecific inhibition of chitin synthesis related to **serine protease inhibition**. - **Effect on Fleas:** When an adult female flea feeds on a treated animal, she ingests lufenuron. The drug is deposited into her eggs, preventing the development of the exoskeleton and the "egg tooth" needed for hatching. → **Eggs fail to hatch** or larvae die during the molting process. - **Fungal/Parasitic Theory:** The theoretical basis for its use against fungi and *E. cuniculi* is that these organisms also contain chitin in their cell walls, though clinical efficacy has not been proven.

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