Zenprox EC Insecticide

4.5 out of 5 stars 28 Reviews | 40 Q&A

Zenprox EC Insecticide

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Average Rating

4.5 out of 5 stars Rating: 4.6

28 Reviews | 40 Q&A

Product Overview

Zenprox EC Insecticide offers broad-spectrum control to kill over 25 different pests. Use indoors in homes, offices, warehouses, and other buildings to control pests like fleas, bed bugs, cockroaches, ants, and more. The non-repellent formula kills on contact and can easily pair with Gentrol IGR or Precor IGR to eliminate insect populations and prevent reinfestation.

Zenprox EC Insecticide can also target newly hatched bed bug nymphs and prevent bed bug eggs from hatching.

Zenprox EC is now available in a 2 oz - single dose bottle for an easy one time use option!

Features and Specs

Active Ingredient: Etofenprox 16.2%, Piperonyl butoxide 64.8%
Target pests: Ants, Bed bugs, Carpet beetles, Cockroaches, Centipedes, Crickets, Darkling beetles, Earwigs, Firebrats, Flies, Fleas, Fruit flies, Gnats, Indian meal moths, Millipedes, Mosquitoes, Moths, Pillbugs, Scorpions, Silverfish, Sowbugs, Spiders (Brown recluse, Black widow, others), Ticks, Wasps and others
* See label for complete list
For use in: Commercial & Residential Indoors: Homes, Apartments, Schools, Medical facilities, Offices, Industrial operations, Storage facilities, Buses, Trains, Non-Food & Non-Feed Handling areas and others
* See label for complete list
Application: 2 oz. per gallon of water
* See label for complete application instructions
Pet safe: Yes, if used as directed on label
Formulation: Professional Product
Shipping Weight: 1.25 lbs
Manufacturer: Zoecon
UPC: 041535792008
EPA Registration: 2724-804


How Zenprox EC Works

Zenprox EC is a liquid insecticide concentrate with the active ingredients Etofenprox and piperonyl butoxide. Etofenprox is a synthetic pyrethroid ether that attacks an insect’s central nervous system. Because most pyrethroids are esters, Etofenprox is especially effective when resistance may be a concern, such as when treating for bed bugs. Piperonyl butoxide has no insecticidal properties of its own, rather it acts as a synergist to keep insecticides stable and to add an extra punch to the killing power of active ingredients. Zenprox EC has a non-repellent effect, and it quickly kills insects that are contacted directly with the spray or that come into contact with treated areas shortly after an application. (Zenprox EC is not designed to have a long residual like many synthetic pyrethroid concentrates.)

Target Insects

Bed bugs, fleas, cockroaches, ants, pantry pests

INSECTS CONTROLLED: Ants, Bed Bugs, Carpet beetles, Cockroaches, Confused flour beetles, Centipedes, Crickets, Darkling beetles, Dermestids, Earwigs, Firebrats, Flies, Fleas, Fruit flies, Gnats, Indian meal moths, Lesser grain borers, Millipedes, Mosquitoes, Moths, Pillbugs, Red flour beetles, Sawtoothed grain beetles, Scorpions, Silverfish, Sowbugs, Spiders (Brown recluse, Black widow, others), Stink Bugs, Ticks, Wasps

Target Uses

Zenprox EC effectively kills fleas, cockroaches, bed bugs, and other listed pests and can be used as a broadcast, spot, or crack and crevice treatment indoors in residential, commercial, and industrial buildings. Zenprox EC is one of the few concentrates labeled for use as a broadcast spray indoors for fleas. (Mix with an IGR such as Precor IGR for the most effective flea treatments.) Zenprox EC is also an excellent choice for treatments when pyrethroid resistance is a concern, such as when treating for cockroaches and bed bugs. Zenprox EC is conveniently labeled for use in many sensitive areas such as hospitals, nursing homes, day cares, and schools (follow specific treatment guidelines).

Zenprox has a residual effect of 3-4 days after the treatment dries, so retreatments may be necessary after 14 days. Zenprox EC is designed to kill on contact to treat existing infestations rather than to provide long-term prevention. Zenprox EC, however, is a non-repellent contact kill, whereas most natural pyrethrin-based insecticides have a repellent effect.

ACTIVE INGREDIENTS: Etofenprox 16.2%, Piperonyl butoxide 64.8%

Application Instructions

Mixing Directions: Zenprox EC mixes easily with water and may be applied with most application equipment. For best results, partially fill sprayer with water, add the labeled amount of Zenprox EC and fill to the required amount of water. Diluted spray mixture may be stored overnight and used the following day, but mixture should be agitated well prior to use.

Tank Mixing: Zenprox EC can be mixed with EPA-registered insect growth regulators (IGRs) in areas where these products are registered to be applied. Use the more stringent label directions when using multiple products.

Repeat treatments to infested areas as necessary, but not less than 14 days after initial treatment.

  • Each 16 oz. (pint) bottle of concentrate yields 8 gallons of finished solution.

Standard Application Dilution Rates / Mixing Ratios:

  • 2 fl. oz./gal. of water – 0.25% - all applications
  • Use 1 gallon of finished solution per 1,000 sq. ft.

For use in the following areas:

Indoors in homes, apartment buildings, hotels, schools, day cares, nursing homes, hospitals, office buildings, correctional facilities, commercial and industrial buildings, warehouses, non-food/non-feed handling establishments, modes of transportation, rail cars, marine vessels, institutions


Broadcast/General Surface Treatments: Use a coarse, low pressure fan spray to apply the dilution uniformly over surfaces to be treated. Apply to carpets, floors, cabinets, cove base, and other areas where pests are located.

Spot or Crack and Crevice Treatments: Use a coarse, low pressure spray or pin stream. Treat entry points such as around water pipes, doors, windows, and eaves. Treat areas where pests normally feed or hide such as baseboards, corners, around water pipes, cracks and crevices. Spot treat floor rugs, beneath furniture, in closets, and storage areas.

Bed Bugs: Disassemble the bed frame and remove bedding. Do not apply product to bedding. Wash bedding and dry using medium to high heat to kill bed bugs. Use a coarse, low-pressure spray to apply to the bed frame, mattress and box spring. Application to mattresses and box springs is intended for treatment of seams, edges, and tufts only. Do not saturate the mattress and box spring. Do not treat the entire surface of the mattress or box spring. Allow spray to dry before using the mattress and/or box spring. Spot treat baseboards, behind pictures/wall hangings, rugs, and other articles in the bedroom or sleeping area. Not recommended as the sole protection against bed bugs.


Zenprox EC is Not for Outdoor Use.


  • Broad spectrum pest control including fleas and bed bugs
  • Kills newly hatched bed bug nymphs
  • Aids in preventing bed bug egg hatch
  • Easy mixing ratio and convenient squeeze and pour bottle design.
  • Newer active ingredient decreases risk of resistance.
  • Does not stain surfaces that are not damaged by water alone.
  • Pet safe when used as directed (keeps pets out of area until product is dry).

Extra Tips

  • Not for use in food/feed handling establishments
  • Mix with an insect growth regulator (IGR) for flea, cockroach, bed bug, or other labeled insects.
  • Do not reapply less than 14 days after initial treatment.
  • Keep children and pets out of treatment area until dry.
  • Do not use outdoors.
  • On questionable surfaces, test a small area before making a large application.
  • Do not mix with oil.
  • Zenprox EC does not provide a long residual, so reapplications may be necessary.
  • Use diluted mixture within 24 hours.
5 stars   23
4 stars   2
3 stars   2
2 stars   0
1 star   1
  • 5 of 5 Stars


    By J.c.s on 06/10/2013

    highly recommend this product took care of my bed bug problem quick don't second guess this product it really does work and with cheaper than the all the product. 1 year now success

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    26 of 27 people found this review helpful

  • 5 of 5 Stars

    Bug Spray

    By S. on 03/22/2012

    Verified Purchase

    I bought this product to use to kill black widow and brown recluse spiders. I've used it once and so far it seems to be working.

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    24 of 27 people found this review helpful

  • 3 of 5 Stars

    Bedbug removal

    By A on 08/07/2015

    It got rid of majority of the bedbugs but I have to order more or the one that doesn't let them reproduce (insect growth regulator) and spray again. But it did help quite a bit. Just glad I didn't have to pay the pest person their $1,000 cost and I could do it on my own. Yes I would recommend this to use.

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    18 of 19 people found this review helpful

  • 5 of 5 Stars

    Major flea infestation

    By Marie on 03/19/2012

    Verified Purchase

    I live in a small mobile home and 2 years ago after a severe storm damaged my underpinning, my 2 dogs had killed a couple of squirrels an brought them home and left them under my home. After I noticed a flea problem that was soon out of control, we went looking for the source. We found fleas on the dead sqirrlels. Clearly, the squirrels has been dead for a long time. My dogs were fine because of comfortis so I never thought about fleas. I, on the oherhand was being eaten alive!!!! I had to move out of my home. I lost all my furniture, mattresses and carpet. I did everything my exterminator told me to do. Nothing and I mean nothing worked!! The fleas love my blood!! This product is the first of several products tried that has made a slight difference in this devestating situation. I am praying that this product along with the precore IGR, will kill all of these fleas for good!!!!

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    15 of 20 people found this review helpful

  • 5 of 5 Stars

    Bedbug Eliminator

    By Lori on 11/06/2016

    Bye! Bye!! Bedbugs.. This product is sent from heaven!!.. I promise you IT WORKS!!

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    15 of 15 people found this review helpful

See all 28 customer reviews

Questions & Answers

Have a question about this product?
What do I mix with Zenprox EC Insecticide?

do i mix this product with water? how much volume will this product yield?

Zenprox is mixed with water. You will use 2 fl oz of Zenprox per gallon of water so each pint bottle will make 8 gallons of finished solution. Be sure to read the Zenprox product label for full instructions.

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24 of 26 people found this answer helpful

Can you use Zenprox EC Insecticide around dogs?
Zenprox is safe for dogs to be around after the treated area has dried. Please remove them from the area that you are treating. The treated area should be dry within approx. one hour and then after the area has dried the dogs can re enter.

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20 of 21 people found this answer helpful

How many Ounces are mixed per gallon to kill bed bugs for zenprx
The mixing ratio of Zenprox is 2oz. to a gallon of water. Please refer to Zenprox Label for further instructions.

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12 of 14 people found this answer helpful

I was told to use Zenprox EC at 25 fl oz / gallon. Is it effective when using it at this rate?

I will mix up a new batch to spray again but should I wait a month or do it right away at the correct rate?

We are not sure who told you to mix Zenprox EC at a rate of 25 Fl oz per gallon water. To mix at a 25% mixture you would mix 2 Fl oz Zenprox EC into one gallon water. We would not recommend to mix any higher. Over application can irritate the pest and cause them to start a frenzy. This makes it harder to treat for them. Please follow the product label for application.

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12 of 13 people found this answer helpful

Can I mix with Tengard 36.8% Permethrin for better results?
Zenprox is only labeled to mix with Insect Growth Regulators for control of insects that would benefit from such a tank mix. Please contact the Zenprox manufacturer Zoecon for further information. You can reach Zoecon by calling 800-877-6374.

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11 of 12 people found this answer helpful

See all 40 customer questions

Zenprox EC Insecticide 4.5 out of 5 stars Rating: 4.6 (28 Reviews / 40 Q&A)

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