than 0 5 u03bcm it is expected that the nanocrystalline form vi of nevirapine would display an even further increase in water solubility and bioavailability efficacy it is foreseen that various methods could be employed to remove the microspheres nanospheres or crystals as they are formed to limit clustering or aggregation thereof it is further foreseen that instead of having a condensation surface 31 alternative collection methods could be employed such as collecting the gaseous phase in a liquid trap alternatively with electrostatic charge or further alternatively by means of a vortex all not shown a ftir overlay was prepared for comparing form v to two known commercially available forms of nevirapine fig6 namely anhydrous and hemihydrous nevirapine fig6 shows that the spectra of the microspheres 34 and the anhydrous form are similar this is an indication that the microspheres 34 contain pure nevirapine and that no degradation took place during the preparation of nevirapine form v applicant further prepared an x ray diffraction pattern of the crystals 36 and found that the crystals displayed the x ray diffraction pattern depicted in fig7 it is foreseen that nevirapine in microspherical and nanospherical form form v or micro nano crystalline form form vi could present substantial advantages over prior art forms for example it was found that a method according to the invention renders the final product in a form suitable for administration in ways not previously possible for example the nevirapine in crystalline form could be administered to a patient suffering from an immune deficiency condition such as hiv infection or aids in.