View Full Version : From Vyvanse to Dex Span. How to dose?

09-14-10, 01:48 AM
I'm on 20mg of vyvanse and it works wonders for 6 hours, then I come down below the "therapeutic" threshold.

I read that vyvanse is kind of a scam, the 12 hours claim works for few.

So if 20mg vyvanse kicks me into gear for 6 hours, what size spanuals do I need?

I read somewhere in a comment 1/3 of vyvanse for dex span dose. So that would be about 6.5 mg.

Maybe to get all day coverage need 3x 5mg? Or 2x 10mg?

I want 12 hours of clarity minimum if possible.

Also, if my HMO is generic only, are the spanuals a bad option?

09-15-10, 06:01 PM
by weight 100mg of vyvanse = 40mg of dexedrine

A ratio of 5:2.

20mg of vyvansee would contain 8mg of dexedrine. Spansules only come in 5mg, 10mg, or15mg versions.

Spansules release 1/2 the dosage immediatly + 1/2 the dosage slowly over the next ~6-8 hours.

The partial IR feature of the spansule will be the biggest difference vs vyvansee which is all time release.


09-16-10, 07:29 PM
I was on 50mg of vyvanse and it worked for a duration of approximately 5 hours, but no longer.

I'm not sure about the equivalencies. I do know that 50mg of vyvanse is equivalent to 20mg of Adderall XR.

I have tried 100mg of vyvanse and it lasted 9 hours. This is the longest that any stimulant has last me, but the side effects were unbearable.

I love dexedrine. I take the instant release.