Modafinil
"Was diagnosed with narcolepsy 30 years ago at age of 40 years old.  For the last 10 years have been on Adderall ( 2 x 20 mg at 8am, 2x 20 mg  and 2x 20mg at 1 pm.) & Ritalin ( 2 x 10 mg at 9am, 12pm &2pm) Reason  for Ritalin was to augment the Adderall "peak and fall off".  I had tried Provigil when it first came on the but it didn't work,  Now at 70 yrs old it seemed that I had developed a tolerance Adderall.  After a lengthy discussion with health care provider, I agreed to give Provigil another try ( 200 mg once daily).  At next doctor's appointment, I complained of the "afternoon fall off" and the dose was changed to 200mg twice daily ( morning and early afternoon),  Issue solved and Provigil is working GREAT!!!"