Wellington, December 20 : Attention deficit hyperactivity disorder pills can cause prolonged and painful erections, it has been revealed.

According to US regulators, Ritalin and similar medicines with the active ingredient methylphenidate could also lead to permanent penis damage, Stuff. co. nz reported.

The National Institutes of Health said that ADHD is one of the most common childhood disorders which can cause difficulty with staying focused and controlling behavior, and 61 percent of patients prescribed methylphenidate or dex methylphenidate products last year were male.

The Food and Drug Administration said that the drugs' labels have been updated to include information about the possible risks. (ANI)