Lufenuron: veterinary dose and monograph

At a glance

Drug class

Antiparasitic

Also known as

Program, Sentinel (component)

Species with doses

Dogs, Cats and Rabbits

General dose range

10–30 mg/kg PO monthly — check the species tables for the indication

Routes

PO, SC

Last reviewed

1 October 2026

Indications

• Long-term flea population control / prevention (breaks the life cycle)
• Flea-allergy dermatitis management (environmental flea suppression, with an adulticide)
• Multi-pet / environmental flea programmes
• (Historical/controversial high-dose use for dermatophytosis — not reliably effective)

Lufenuron dose by species

Doses are per administration unless stated. mg/kg doses scale with body weight; per-animal, per-quarter and infusion-rate doses are shown as the reference writes them.

Dogs

• Flea control (monthly, with food): Papich 5e: 10 mg/kg every 30 days PO with a meal. Not adulticidal (insect development inhibitor) — combine with an adulticide if fleas are present. Dermatophyte use (80 mg/kg) is of questionable efficacy (Papich).

Cats

• Flea control (monthly oral): Papich 5e: 30 mg/kg PO every 30 days (Plumb’s: per the Program label). Give with food. Cats need a higher mg/kg than dogs.
• Flea control (6-month injectable): Papich 5e: 10 mg/kg SC every 6 months — the depot gives about 6 months of flea life-cycle control.

Rabbits

• Flea control: Plumb’s p.744 (Ivey & Morrisey 2000): rabbits 30 mg/kg PO every month.

Contraindications

Use as a sole treatment for an active, heavy flea infestation (it won't kill the adults already biting). Known hypersensitivity. Give with food (fat) for adequate absorption. Otherwise minimal contraindications.

Species-specific warnings

Cats: Cats require a higher dose (~30 mg/kg) than dogs; the long-acting injectable is cat-specific.

Adverse effects

• Very well tolerated; occasional mild GI upset or lethargy
• No adulticidal effect (a limitation, not a side effect)
• Rare local reaction (injectable, cats)

Drug interactions

• No significant systemic drug interactions
• Often combined with milbemycin (Sentinel) for added heartworm/intestinal-worm control, or with an adulticide for active infestations

Pregnancy and lactation

Considered safe in pregnant/lactating dogs and cats at label doses.

Monitoring

• Flea population control over weeks–months (it works gradually)
• Compliance (monthly dosing, with food)
• Add/confirm an adulticide if live fleas persist

Toxicity and overdose

Exceptionally safe — mammals lack the chitin target. Overdose is generally innocuous (mild GI upset at most). The practical "failure" is using it alone during an active infestation, where adult fleas keep biting until the population dies out.

Management: Supportive; no specific antidote needed given the wide margin.

Clinical pearls

• A birth-control pill for fleas — it sterilises the environment over time but kills no adults, so pair it with an adulticide (e.g. nitenpyram) when fleas are already present
• Must be given WITH FOOD (it is fat-soluble) or absorption — and efficacy — drops
• Cats need a much higher mg/kg than dogs; a 6-month injectable exists for cats
• Outstanding safety (mammals have no chitin) makes it suitable for proactive, long-term household flea programmes
• Treat all pets in the home for it to work

Mechanism of action

A benzoylphenylurea that inhibits chitin synthesis/deposition in insects. When a flea ingests blood from a treated animal, lufenuron is transferred to its eggs and larvae, preventing formation of the chitin exoskeleton — eggs fail to hatch and larvae die at moulting. It is not toxic to the adult flea and has no effect on mammals (which lack chitin), giving an excellent safety margin.

Formulations and products

• Oral tablet/suspension (Program) — dogs ~10 mg/kg
• Oral suspension — cats ~30 mg/kg
• Injectable 6-month depot — cats
• Program (Elanco (Novartis)) — Lufenuron tablets/suspension; feline 6-month injectable, Tablet / suspension / injection
• Sentinel (Elanco) — Lufenuron + Milbemycin oxime, Flavoured tablet (combination)

Storage

Tablets/suspension: 15–30 °C, dry. Injectable: per label (shake well). Protect from light.

Before you use this dose

Reference doses for veterinary professionals. Confirm the dose against the product label, the patient’s condition, current guidance and local regulations before use; the attending veterinarian remains responsible for every clinical decision.

Other antiparasitics

• Ivermectin
• Levamisole
• Levamisole + Oxyclozanide
• Lotilaner
• Mebendazole
• Meglumine Antimoniate
• Melarsomine
• Milbemycin oxime

Frequently asked questions