Volkow said modafinil acts slowly when swallowed and is difficult to inject, making it less likely to be abused. Its high price, about $10 per pill
compared to Ritalin at $2 per pill
, also makes it less attractive to people seeking a high. That may change when generics become available in 2012, Volkow said.
Jeffry Vaught, chief science officer for Cephalon, said the company has seen no evidence the drug is highly abused.