What it does
Cypermethrin is a type of insecticide used to control pests.
Commonly used for: insect bites, pest control
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Source: Pharmacy and Medicines Regulatory Authority · fetched 2026-04-21 17:37:40 · updated 2026-09-29 04:33:05
About this medicine
Cypermethrin is a type of insecticide used to control pests.
What it treats
- insect bites
- pest control
How it works
It targets and disrupts the nervous system of insects, leading to their death.
Who it's for
It is used by individuals needing to manage pest problems in their homes and gardens.
AI-assisted summary grounded in BNF data - general information only, not medical advice. Always confirm with your pharmacist or doctor.
Clinical monograph: cypermthrin
Cypermethrin is a synthetic pyrethroid insecticide commonly used for pest control in agricultural and domestic settings. It acts as a neurotoxin to insects, causing paralysis and death. Cypermethrin is effective against a wide range of pests, including mosquitoes, flies, and agricultural pests, making it a versatile choice in pest management.
Indications
- Control of agricultural pests
- Vector control, including mosquitoes
- Indoor pest management
Dosage
Children: Refer to specific product guidelines for appropriate dosing as it varies by formulation and application method.
Adults: Refer to specific product guidelines for appropriate dosing as it varies by formulation and application method.
Mechanism of action
Cypermethrin exerts its insecticidal activity primarily by disrupting the normal functioning of the nervous system in insects. It binds to voltage-gated sodium channels in the neuronal cell membranes, leading to prolonged depolarization, repetitive firing of action potentials, and ultimately paralysis and death of the target insects. This mechanism is crucial in disrupting the normal transmission of nerve impulses, causing hyperexcitability of the nervous system.
Pharmacodynamics
Cypermethrin is known for its rapid action against target pests. The compound displays a high degree of efficacy at low concentrations, which is characteristic of many pyrethroids. Its ability to persist in the environment enhances its effectiveness, allowing for prolonged pest control. However, its toxicity is primarily limited to insects, with significantly lower toxicity to mammals and birds, making it a popular choice in integrated pest management.
Pharmacokinetics
Cypermethrin is generally poorly absorbed through the gastrointestinal tract in mammals, and its absorption may vary based on the formulation. It is metabolized in the liver, with metabolites being excreted primarily through urine. The compound has a relatively short half-life in the body, and its elimination is rapid. Environmental persistence depends on factors such as temperature, moisture, and microbial activity, but it can remain active in the environment for extended periods.
Adverse effects
- Skin irritation
- Nausea
- Vomiting
- Headache
- Dizziness
- Respiratory distress
Precautions
- Avoid contact with skin and eyes
- Use personal protective equipment when handling
- Keep out of reach of children
- Use in well-ventilated areas
Pregnancy
Cypermethrin is classified as a Category B pesticide, indicating that it is not expected to cause harm to the fetus when used as directed. However, caution is advised.
Breast-feeding
It is not known whether cypermethrin is excreted in human milk. Caution should be exercised when administering to nursing mothers.
Storage
Store in a cool, dry place away from food and feed. Keep container tightly closed and away from children.
Formulations
- Emulsifiable concentrate
- Aerosol
- Granules
- Dust
AI-synthesized from BNF references - general information only, not a substitute for professional medical advice or the current BNF. Verify doses with a pharmacist.