No, no side effects. And for some reason it does seem to take longer than others to dissolve. I also wonder if with some ferrets, a bit of scar tissue will form around the implant making them take longer for the body to dissolve.
Ferrets: Contessa, Frankenfurter, Butterscotch. Kitties: Watson, Oskar DIP Sinnead, Vincent, Boris, Zeus and Athena, Willow, Mr. Frodo, Indie, Lucrezia, Judge, Odin, Miss Emily, Suki, Cody, Aristotle. RIP Herne, Ligeia, and Mr. Stubbs
I met a little old "naked" sprite at a shelter, a very much loved permanent resident. She was over 7 and had no fur left at all. You could clearly see a whole bunch of implants around her shoulders, so I think that in many cases they don't dissolve. I wish they did, it's a little creepy to think of them all there. I always think of that when I get Maisie implanted, and worry that the vet will accidentally run into an old one when implanting a new one!