Process for manufacturing a resulting pharmaceutical film
The invention relates to the film products and methods of their preparation that demonstrate a non-self-aggregating uniform heterogeneity. Desirably, the films disintegrate in water and may be formed by a controlled drying process, or other process that maintains the required uniformity of the film. The films contain a polymer component, which includes polyethylene oxide optionally blended with hydrophilic cellulosic polymers. Desirably, the films also contain a pharmaceutical and/or cosmetic active agent with no more than a 10% variance of the active agent pharmaceutical and/or cosmetic active agent per unit area of the film.
1. A process for manufacturing a resulting pharmaceutical film suitable for commercialization and regulatory approval said resulting pharmaceutical film having a substantially uniform distribution of a desired amount of a pharmaceutical active in individual doses of the resulting pharmaceutical film, comprising the steps of:
(a) forming a Non-Newtonian visco-elastic polymer matrix, comprising a polymer selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose, polyacrylic acid, sodium carboxymethyl cellulose, ethylcellulose, polyacrylates, cellulosic polymers, carboxymethyl cellulose, polyethylene oxide and combinations thereof; a solvent selected from the group consisting of water, a polar organic solvent and combinations thereof, and the active selected from the group of anti-convulsants, anti-depressants, anti-diarrhea preparations, anti-nauseants, anti-parkinsonian agents, central nervous system stimulants, erectile dysfunction therapies, gastrointestinal agents, muscle relaxants, psychotherapeutic agents, psycho-tropics, stimulants, anti-psychotics, and neuromuscular drugs, and combinations thereof, which polymer matrix is a shear-thinning pseudoplastic fluid when exposed to shear rates of 10-10 5 sec −1 , said polymer matrix having a substantially uniform distribution of said pharmaceutical active;
(b) casting said polymer matrix;
(c) conveying said polymer matrix through a drying apparatus and evaporating at least a portion of said solvent to rapidly form a visco-elastic film having said pharmaceutical active uniformly distributed throughout by rapidly increasing the viscosity of said polymer matrix upon initiation of drying within about the first 4 minutes to maintain said substantially uniform distribution of said pharmaceutical active by locking-in or substantially preventing migration of said pharmaceutical active; wherein the temperature of the polymer matrix is 100° C. or less;
(d) forming the resulting pharmaceutical film from said visco-elastic film, wherein the resulting pharmaceutical film having said substantially uniform distribution of pharmaceutical active by said locking-in or substantially preventing migration of said pharmaceutical active is maintained;
(e) sampling the resulting pharmaceutical film at different locations of the resulting pharmaceutical film, wherein said sampled resulting pharmaceutical film has a water content of 10% or less; and
(f) performing analytical chemical tests for content uniformity of said pharmaceutical active in substantially equal sized individual dosage units of said sampled resulting pharmaceutical film said tests indicating that uniformity of content in the amount of the active varies by no more than 10% from the desired amount of the active.