Instant/Immediate release dexedrine comes in tablets. Extended release dexedrine 'spansules' are little capsules filled with little orange balls,the caps are clear and black, I believe (this is for the 10 mg spansules). For more info, check out www.rxlist.com .
i've encountered 5mg tablets, and 10 and 15 mg capsules.
i find the 10mg's most effective for eating, but the 5mg's are obviously the best for railing.
there's also rumours of a 20mg pill....but i've never seen one.