Getting the methylphenidate out of normal tablets which do not have extended time releasing qualities is pretty simple, taking in account that the methylphenidate is soluble in water whilst the other inactive ingredients are not: Disolve the pill in cold water, filter the solution, throw away the precipitate, let the water evaporate and you are done.
However, what happens when you try to get the methylphenidate out of extended time release tablets such as concerta? These have as a main inactive ingredient lactose, which is even more soluble in water than methylhenidate is. Now we cant use water to dissolve methylphenidate in it because the lactose will also dissolve, and we will not be able te separate both of them using the previous method.
Methylphenidate hidrochloride (HCL), which is how it comes in pharmaceutical preparations, is very soluble also in alcohol, whilst lactose is not soluble in it (some of it can dissolve, however, but not any significant quality). To make as little lactose as possible dissolve in the alcohol, we must keep the temperature of alcohol at 10ºC (30 minutes in the fridge). At that temperature, lactose will very difficoultly dissolve in the alcohol, while the methylphenidate will dissolve without any problems. Now we just have to filter the solution, throw away the precipitate (which will be mainly lactose) and let the alcohol evaporate so that we are left with the methylphenidate.
This is a great harm reduction method to avoid insufflating enormous quantities of lactose, which could block in a very umpleasant way your respiratory pathways. Also, its a great method for those who are lactose-intolerant to ingest methylphenidate without getting sick from the lactose. Finally, its a great way for those of you drogophiles who like to have your substances as pure as possible, taking away all the cuts and unnecessary inactive ingredients.
However, I want to ask you guys a question about this, in case some of you know it from personal experience or from theoretical knowledge: Which alcohol will be the bst one to make as much methylphenidateas possible dissolve in it and at the same time making the least lactose dissolve in it. In other words: In which alcohol is methylphenidate more soluble in and at the same time lactose least soluble in? Maybe isopropyl alcohol? Ethanol? A mixture of both of them (such as the one they sell for disinfecting wounds)?