|Trade names||Revolution, Stronghold|
|Mol. mass||769.96 g/mol|
|(what is this?)|
Selamectin (trade names Revolution, Stronghold) is a topical parasiticide and antihelminthic used on dogs and cats, distributed by Zoetis, a former Pfizer subsidiary. It treats and prevents infections of heartworms, fleas, ear mites, sarcoptic mange (scabies), and certain types of ticks in dogs, and prevents heartworms, fleas, ear mites, hookworms, and roundworms in cats. Selamectin is not approved for human use.
The drug is applied topically. It is waterfast, and does not lose its effectiveness with bathing. It is packaged according to its varying dosage sizes, and is applied once monthly.
Mode of action
Selamectin disables parasites by replacing glutamate in their muscle synapses; glutamate is the amino acid that normally interacts with the receptors that open chloride channels into the muscle. Selamectin interferes with this process; it activates the chloride current without desensitization, allowing chloride ions to enter the nerve cells and causing neuromuscular paralysis, impaired muscular contraction, and eventual death.
The substance fights both internal and surface parasitic infection. Absorbed into the body through the skin and hair follicles, it travels through the bloodstream, intestines, and sebaceous glands; parasites ingest the drug when they feed on the animal's blood.
Selamectin has been found to be safe and effective in a 2003 review.
Selamectin has high safety ratings, with less than 1% of pets displaying side effects. In cases where side-effects do occur, they most often include passing irritation or hair loss at the application site. Symptoms beyond these (such as drooling, rapid breathing, lack of coordination, vomiting, or diarrhea) could be the result of shock as a result of selamectin killing heart worms or other vulnerable parasites in high levels in the bloodstream of dogs untested potential infections prior to using the medication rather than an actual allergic reaction to the drug itself.
Main rival products for dogs include ivermectin (trade names Stromectol, Ivermec and others) or milbemycin oxime (Interceptor) for heartworms, Advocate from Bayer (Imidacloprid and moxidectin), fipronil (Frontline) or lufenuron (Program) for fleas, or the combination milbemycin oxime/lufenuron (Sentinel) for both.
- "Zoetis.com page identifying both Revolution and Stronghold as its selamectin brands". Zoetis Inc. Retrieved 2014-03-20.
- Pipano, E. (2003). "Recent Developments In The Control Of Ectoparasites And Endoparasites Of Dogs And Cats With Selamectin". Israel Journal of Veterianry Medicine 58 (2–3). Archived from the original on April 14, 2008. Retrieved 2008-07-05.