Doctors always start you out on the lowest dose and wait for your feedback. When V is working it should last for about 10 hours. Anything less would probably be an indication of needing to increase the dose.
I would say its time to tell your doctor that it does not appear to be working and see what is suggested.
Here is a good video link from Dr. Charles Parker on medication dosage. I think you will find it helpful! The link is - https://www.youtube.com/watch?v=S0gir0CPLjo
Let me know if you have any questions. Happy Holidays.
I take 20 Mgs of Vyvance. It has helped my focus.
I have bipolar disorder. All of your meds need to work in concert. Pamela
The dose of the medication is going to affect everyone different because we are all different. A lot of how the drugs work and are distributed will go based on the amount of fat/muscle someone has. me and my husband both take vyvanse 50mg he has a different reaction to the drug than i do. when the drug hits after an hour for me i instantly have my heart racing and experience the "high" like sensation, where my husband does not. I feel alot more of the physiological changes from the drug than what my husband does. that being said it's trial and error until you find the right dose for you.