The invention relates to a substrate coating for the electrostatic deposition of dry powder medicaments for use in the manufacture of pharmaceutical dosage forms comprising micronized polyethylene glycol (PEG), with A molecular weight in the range of 1,000 to 20,000, and having a particle size of 1-100 .mu.m. The invention also relates to pharmaceutical compositions having such a substrate coating, and processes for manufacturing such pharmaceutical compositions. The invention also relates to the technology of reversing negative charge of medicaments so that they can be electrostatically deposited on a negatively charged substrate.