<a href=http://stromectol.homes/>ivermectin 3mg tab</a> Smoking tobacco Using alcohol Using certain illicit drugs Being overweight Having certain past or present infections Being exposed to toxins Overheating the testicles Having experienced trauma to the testicles Having a prior vasectomy or major abdominal or pelvic surgery Having a history of undescended testicles Being born with a fertility disorder or having a blood relative with a fertility disorder Having certain medical conditions, including tumors and chronic illnesses, such as sickle cell disease Taking certain medications or undergoing medical treatments, such as surgery or radiation used for treating cancer