I bought some from India to have on hand just incase. I caught the wu flu and started on it right away. Mine came on like a sinus headache. I did a half hour on my elliptical earlier that morning and it got worse and worse to where I had to leave work. I lost taste and smell the next day. I had one day of feeling like crap. Took about two weeks to get my taste and smell back. The people I know that still have no taste and smell didn't take ivermectin.