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It is a derivative of ivermectin, so if you are trying to avoid the "ectins"--as I am--don't use Revolution.

Ivermectin products can be toxic to Collies, due to the chemical potentially crossing the blood brain barrier, and as cats are so sensitive to chemicals, I would never use any of the "ectins" on cats either.  But I do understand your hesitancy about using pyrethrins, which I had used for years...

Be sure to shake pipette thoroughly before drawing up each dose to be sure the active ingredients are evenly dispersed.  What I do is use the needle on the syringe to make a small hole near the top of the container and keep the pipette upright in the foil packaging to store it. Also, as far as...

I just bought a Frontline plus knockoff which has the IGR Novaluron.  The cat version, made by Sentry, contained methoprene, which I have used for years in other brands/products with no problems, but the dog formula was different.  I did some research on this formula (fipronil and Novaluron) and...