To provide a pharmaceutical composition comprising a tricyclic compound or its pharmaceutically acceptable salt; monohydric alcohol fatty acid esters; dibasic acid diesters; lower alkylene carbonates; butylene glycol; diethylene glycol monoalkyl ethers; and thickeners. In one embodiment, the controller is adapted to limit rates at which electric current is applied to or removed from the electroactive material to predefined rates, thereby reducing the potential for high frequency harmonic emissions. Furthermore, the tubular hub is provided with a plurality of retainers for releasably holding the metal ring in the tubular hub. The char is separated and combusted in the char combustor, in the presence of oxidized metal oxide sorbents, into a gaseous stream of carbon dioxide and water vapor. The dielectric layer contacts the second surface and has a refractive index lower than that of the first layer.