Lufenuron

What is this medication for?

• Flea population control (≥6 weeks; Sentinel combo ≥4 weeks for +HW/intestinal parasites) — does NOT kill adults or pupae
• Adjunct for dermatophytosis (fungi use chitin too)

How is it given?

Give exactly as your veterinarian prescribed — never change the dose or stop on your own unless your veterinarian has told you to.

• "Flea birth control": the exam-ready one-liner — adults live, eggs die; pair an adulticide (Capstar/spinosad/spot-on) because clients want visible fleas gone NOW, lufenuron handles the future.
• Chitin-in-fungi recycling: the same mechanism justifies dermatophytosis adjunct use (weaker evidence, never solo).

What if I miss a dose?

• Give it as soon as you remember — unless it is almost time for the next dose (then skip the missed one; never double up).
• Call your clinic if you miss more than one dose in a row.

Side effects — what should I watch for?

Effects listed as common in this handout

• None at recommended doses (The cleanest safety line in the library)

Worth a phone call to your veterinarian

• Any new symptom that worries you.

⚠️ Contact your veterinarian or an emergency clinic IMMEDIATELY if you notice

• Trouble breathing, collapse, seizures, severe vomiting or diarrhea, facial swelling, or pale gums

Before starting (or refilling), tell your veterinarian if your pet:

• has or has had: All pets in household must be treated (untreated animals = reservoir); no tick activity; not monotherapy for established infestations

• is pregnant, nursing, or used for breeding
• is taking any other medications, supplements, or flea/tick products, including:
  • Nitenpyram
  • Spot-ons/oral adulticides

Storage and handling

Monthly tablets/suspension (liquid for cats mixed in food); Sentinel = the HW-intestinal combo.

Good to know

• "Flea birth control": the exam-ready one-liner — adults live, eggs die; pair an adulticide (Capstar/spinosad/spot-on) because clients want visible fleas gone NOW, lufenuron handles the future.
• The 60–90 day lag and all-pets-treated rules are the two counseling points that prevent "it doesn't work" complaints.
• Chitin-in-fungi recycling: the same mechanism justifies dermatophytosis adjunct use (weaker evidence, never solo).