According to Drugs.com, Adderall is a central nervous stimulant that’s most often prescribed to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy, a sleep disorder that causes extreme sleepiness and occasional daytime sleep attacks. The drug contains a combination of amphetamine and dextroamphetamine, both strong stimulants.
Although WebMD lists the inability to have an erection as an infrequent side effect of Adderall, it seems that a surprisingly large number of men are reporting that they’ve experienced difficulties achieving an erection after taking Adderall for an extended period of time. In one of life’s cruelest ironies, amphetamines tend to increase sexual desire but typically cause erectile dysfunction, according to the Merck Manual.
A quick check of forum posts on this issue shows that many individuals who have been prescribed Adderall for ADHD find that the problem tends to ease after they’ve been on the drug for a while. And some say that their erections while taking Adderall are not as strong as they were previously.