What are possible adverse effects of methylphenidate therapy for attention deficit hyperactivity disorder (ADHD)?

Updated: Oct 01, 2019
  • Author: Stephen Soreff, MD; Chief Editor: Glen L Xiong, MD  more...
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Answer

The FDA has warned that methylphenidate may rarely cause prolonged and painful erections, known as priapism. Because priapism may cause permanent damage to the penis, patients taking methylphenidate who develop an erection lasting longer than 4 hours should seek immediate medical attention. [56]


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