Cheese heroin is made by taking powder heroin and crushed diphenhydramine tablets, and adding them to water such that the active ingredients dissolve into the solution. The solution is then filtered via a micron filter to remove all the cuts and binders/fillers, leaving the user with a solution of high purity diamorphine HCl and diphenhydramine hcl. The water is then evaporated off, yielding a clumpy powder containing a highly purified mixture of heroin and DPH. It can also be further purified by titrating the solution with a weak to intermediate base such as sodium carbonate or sodium hydroxide to freebase the diamorphine and DPH.