Stimulants Rubifen, what is the BA snorted?

[Rafayte]

I take Rubifen 20mg which are 20mg IR methylphenidate tablets. I take it in 40mg orally doses and occasionally I snort 20mg doses. I know that BA of methylphenidate orally is 30% but I don't know what is the methylphenidate snorted BA but I know that BA is higher snorted than orally. The orally BA is 30% but from this 30% that arrive to blood the 90% cross the BBB. So, what is the methylphenidate snorted BA?
I usually drink coffee while I take Rubifen but today I have taken two 40mg orally doses without coffee. I am going to take caffeine but I don't know if do it drinking coffee or taking guarana caps I have. The caps have only 15mg caffeine each so when I take it I take 3 caps that are 45mg caffeine but now I am going to take 6 caps so I take 90mg caffeine

 

[Rafayte]

Now I have taken 6 guarana caps that is 90mg caffeine but too it contains teofiline and theobromine. Too I usually take ginseng with methylphenidate but today I have not taken it so I don't know if is good to take ginseng or methylphenidate and caffeine is enough

 

[Sertürner]

I have tried oral, insuflated, and IV methylphenidate. I cannot give an exact answer or source but I agree the BA is definitely higher when snorted as opposed to oral. IMO snorting gives a very similar experience to IV but without the rush.

Purely speculation, but I would estimate a BA of at least 60-70%.

Anybody else know the BA of insufflated methylphenidate? I am curious about this too now?

 

[Jabberwocky]

http://psychology.wikia.com/wiki/Methylphenidate

Looks like somewhere possible 50-60% intranasal, but you guess is as good as mine.