@entity2727 is a commonly prescribed treatment for @entity71 ( @entity71 ). However, little is known about its adverse effects on the male reproductive system. We report a 20-year-old male @entity1 whose chief complaint was of delayed @entity1175 . He spoke in a high-pitched voice and complained of lack of body hair, impaired libido, inadequate erectile function, chronic fatigue, and low energy. He had been treated with @entity2727 as an @entity1 and had continued treatment for 17 years. On examination, the @entity1 was lean and visibly lacked facial or body hair. He further explained that he had never been able to grow underarm or facial hair and that he was often mistakenly considered a young teenager rather than a 20-year-old. The @entity1 's genitalia were categorized as Tanner Stage 2. Laboratory studies confirmed low serum follicle-stimulating hormone (FSH), luteinizing hormone (LH), and @entity251 levels. The @entity1 was given exogenous @entity251 supplementation with pellets and @entity1 chorionic gonadotropin to maintain testicular size. After 4 months his symptoms improved and he demonstrated signs of @entity1175 . Our goal is to further elucidate the possible impact of @entity2727 on the male reproductive system.

Case Report: Testicular failure possibly associated with chronic use of XXXX .

@entity1 :: ('9606', 'Species') :: ['human', 'patient', 'infant'] @entity251 :: ('MESH:D013739', 'Chemical') :: ['testosterone'] @entity71 :: ('MESH:D001289', 'Disease') :: ['ADHD', 'attention deficit hyperactivity disorder'] @entity1175 :: ('MESH:D011628', 'Disease') :: ['puberty'] @entity2727 :: ('MESH:D008774', 'Chemical') :: ['Methylphenidate', 'methylphenidate']
@entity2727 :: (MESH:D008774,Chemical) :: ['methylphenidate']
