Methylphenidate hydrochloride (Ritalin; Novartis, Basel, Switzerland or Concerta: Johnson & Johnson, New Brunswick, New Jersey) is considered a safe drug for children with attention-deficit/hyperactivity disorder (ADHD). Generally, adverse effects include insomnia, gastrointestinal symptoms, or cardiovascular effects with rare reports of maculopapular eruption, urticaria, and alopecia.
Correspondence: Dr Heinzerling, Department of Dermatology, University Hospital Erlangen, 90152 Erlangen, Germany (firstname.lastname@example.org).
Financial Disclosure: None reported.
Additional Contributions: We thank Heinrich Otremba, MD, for referring his patient to our clinic and for his continued good cooperation, and Michael Mayer, MD, for referring control patients for the LTT.