Active ingredient Cypermethrin

Active ingredient Cypermethrin

What is Cypermethrin?

  • As a synthetic pyrethroid insecticide, Cypermethrin is commonly used to control a variety of insects in households, commercial properties, and agriculture.
  • According to statistics on the list of pesticides allowed to circulate in Vietnam in 2023, there are nearly 50 companies registered to trade this active ingredient, including single ingredients and mixtures with active ingredients such as Indoxacarb, Isoprocarb, Chlorfenapyr, Profenofos...

How does this ingredient work?

  • Cypermethrin acts as a contact and stomach poison. This active ingredient functions as a fast-acting neurotoxin in insects, causing their loss of control, muscle spasms, paralysis, and preventing the pests from feeding or functioning properly, ultimately leading to their death.
  • In addition, Cypemethrin also has the effect of repelling and making worms lose their appetite.

Pros and cons:


  • Cypermethrin is quite widely used in many places such as industrial areas, sports fields, grain warehouses, and pet farms thanks to its broad spectrum of action and quick pest-killing effect. In addition, the active ingredient has good effects on ornamental plants and shrubs.
  • Active ingredient Cypermethrin breaks down easily in soil and plants but can maintain activity for weeks when sprayed on inert indoor surfaces. When exposed to sunlight, water and oxygen, Cypermethrin will decompose faster.


  • Preharvest interval period (PHI) is quite long (from 7-14 days). The product should be used immediately after dilution because the acid in the water can start to degrade the active ingredient, making the product less effective over time.
  • Cypermethrin belongs to toxicity class II with a relatively high impact index. However, Cypermethrin is only toxic when it comes into contact with the skin or is ingested. Cypermethrin can cause mild skin and eye irritation at low levels of exposure. If exposed at high levels, this active ingredient can cause nausea, headaches, muscle weakness, seizures,... Ingesting high doses of Cypermethrin can lead to death.
  • As a broad-spectrum insecticide, Cypermethrin is also poisonous for beneficial insects like bees and fish. Continuous use of this active ingredient can lead to drug resistance, outbreak of pests, as well as reduced effectiveness if insects can avoid it.

Cypermethrin applications:

  • In Vietnam, Cypermethrin is registered to treat pests and insects that damage plants such as armyworms, floatworms, stem borers, leaf rollers, scale aphids, mealybugs, twig borers, armyworms, Stink bugs harm flowers... on many types of crops such as industrial crops (coffee, cashew), fruit trees (oranges, tangerines...), rice, potatoes... The drug can be mixed with many types of pesticides, other diseases.
  • Cypermethrin is used to control parasites that cause diseases in livestock and poultry, control dog ticks and some types of insects.
  • In particular, the product is commonly used in medical preparations to kill insects such as flies, mosquitoes, ants, cockroaches,...
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