It is in a powder, however the powder is not water soluble. You need to sequester it with ethyl alcohol. Everclear works best, but regular 80 proof grain vodka works just fine. You really only need about .75 cc of vodka for each 1/4 teaspoon of prazi. The goal is to mix it into a paste like substance as too much "free" vodka can trigger a bacterial bloom. Especially considering it is almost always used in a newer Qt setup without a protein skimmer. It begins to decay at around 72 hours so the ideal dosing regimen is every three days, 1/4 tsp for 20-40 gallons. I have successfully used about 3x this concentration for short term baths, as the prazi itself is very safe and completely non toxic. The only type of fish I've encountered with sensitivity to the increased dosage are Wrasses. They will become lethargic and look to be dead but with adequate removal of the prazi via protein skimming 99 times out of 100 they recover just fine.
Hope that helps
BTW i can measure out doses in teaspoons. My gramscale fell into a tank lol. Tom is kind enough to be coming by the store tomorrow morning as I cant make it to the meeting. But if you are going I can certainly sell you some. Just LMK
Sean