Yes it is Merry. My reaction was the same as yours at first but after my wife, a retired RN, and I did a lot of research we decided to give it a try. At that point, what did I have to lose? 12 weeks later I was cancer free and Dr called me a miracle. Maybe it was the Keytruda, maybe it had nothing to do with fenbendazole, maybe a combination, all I can say is something worked for me, I’m grateful and believe I’m alive so I can share my story. I’ve had absolutely no side effects, well just one, tried scratching behind my ear with my foot and threw my back out . lol.