No, the T/Gel coal tar shampoo won't worsen hair loss. I've even used the product a lot before when I was a kid and it did absolutely nothing to make hair fall out. I've also used it before and after male pattern baldness treatments and still didn't make my hair loss worse. I wouldn't worry about it, I think it's a nice product, I don't use it anymore though since I made the full switch to using Ketoconazole shampoos.