Hi and Welcome to JA.
The dose of 2 5mg tablets three times a day that is 30mg in 24 hours is normal dose. It is not very high dose. Patients can take up to 60mg per day.
But it would be worth talking to your doctor, especially, if she is getting any bad side effects.
Here is link, which provide comprehensive details about Dexedrine Tablets:
http://www.drugs.com/PDR/Dexedrine_Tablets.html
I hope this helps, if so please accept or JUST ASK AGAIN. Thank you.
Cheers!
Edited by salcom on April 3 2006 at 5:48 PM