Abstract: A dosage unit comprises a substrate comprising a first polymer; a deposit, including an active ingredient; and a cover layer comprising a second polymer, wherein the cover layer covers the deposit and is joined to the first surface of the substrate by a bond that encircles the deposit and wherein at least one of the first and second polymers is a graft co-polymer. The dosage unit wherein said first and second polymers may be the same, and also the graft co-polymer may be a polyvinyl alcohol-polyethylene glycol graft co-polymer. Also disclosed is a dosage unit wherein the deposit is formed on the substrate by electrostatic dry drug deposition. The dosage unit may also include a polymer that is a graft co-polymer; and an active ingredient, and the graft co-polymer may be polyvinyl alcohol-polyethylene glycol.