RenAvast is said to be 100% safe with no side effects, and can be used with other drugs and supplements. RenAvast can be mixed with a small amount of food to ensure that the cat eats the entire amount, or it can be mixed in a syringe with water and given directly by mouth. Browse this site www.californiapetpharmacy.com/RenAvast-dogs-60ct.html for more information about RenAvast and also you can follow us on www.facebook.com/pages/RenAvast/211581422213867.