A single oral dose lasts 30 days. A longer acting injectable form is available for cats. One injection is effective for 6 months. Shampoos, adulticide collars, sprays, mousses and powders are still available and can be useful under certain circumstances. They contain such ingredients as pyrethrins, pyrethroids, carbamates and organophosphates.
Natural insecticides are available, however most claims of effectiveness are purely anecdotal.
The include ingredients such as rosemary, wormwood, pennyroyal, eucalyptus, citronella and diatomaceous earth. Premise and environmental control products are useful in affecting a rapid start when combating an existing flea infestation. We recommend you contact your veterinarian prior to purchasing any flea control products. This information can often be obtained over the phone at no charge. Salespersons in petstore outlets do not have the knowledge of a trained veterinarian.