Insect Spray contains ivermectin, and is effective against lice, mites, ticks and internal gut worm infections. Insect Spray is a Veterinary Medicine for use in the UK under the Small Animal Exemption Scheme. It is effective against a wide range of ticks and mites, including snake mites, red mites and subcutaneous species. Symptoms of mite infections are listlessness and decreased activity, a dull appearance and crusting of the scales.