How can fleas be poisoned on a human? - briefly
Apply a certified topical insecticide such as permethrin or fipronil to the skin according to the product label, which kills fleas on contact. For extensive infestations, a medical professional may prescribe oral ivermectin to eradicate the parasites systemically.
How can fleas be poisoned on a human? - in detail
Fleas that are feeding on a person can be eliminated by applying agents that act systemically or topically, provided the products are approved for human use and applied according to label directions.
Topical treatments include insecticide‑containing creams, lotions, or sprays. Permethrin 5 % cream is the most common choice; it disrupts the nervous system of the arthropod, leading to rapid paralysis and death. Application to all affected skin areas, leaving the product to dry, ensures contact with insects that are moving across the surface. For hair‑bearing regions, a shampoo formulated with pyrethrins or a dimethicone‑based lotion can be used, as these substances coat the exoskeleton and interfere with respiration.
Systemic options involve oral medications that circulate in the bloodstream. Ivermectin, taken at 200 µg/kg as a single dose, reaches concentrations sufficient to kill ectoparasites that ingest blood. The drug’s mechanism is binding to glutamate‑gated chloride channels, causing hyperpolarization of nerve cells. Safety monitoring includes checking for contraindications such as liver disease, pregnancy, or known hypersensitivity. A second dose may be required after 7–10 days to address any newly emerged fleas.
Environmental control supports direct treatment. Washing clothing, bedding, and towels in hot water (≥ 60 °C) for at least 30 minutes destroys eggs and larvae. Vacuuming carpets and upholstery removes adult fleas and their developmental stages; the vacuum bag should be discarded immediately. Residual sprays containing an insect growth regulator (e.g., methoprene) can be applied to indoor surfaces to prevent maturation of any surviving eggs.
When selecting a method, consider the following safety checklist:
- Verify product registration for human application.
- Read dosage instructions and weight‑based calculations.
- Confirm absence of contraindicating medical conditions.
- Use protective gloves when handling concentrated formulations.
- Dispose of contaminated materials in sealed containers.
Professional medical consultation is advisable if the infestation persists after two treatment cycles, if severe skin reactions develop, or if the individual has immunocompromising conditions.