A preparation with a property of improved Disintegration, a preparation that shows an enhanced bioavailability of a Drug, the production method of the same and similar. Preparation of rapidly disintegrating comprising Granules comprising Medicine coated with a coating layer containing sugar or a Sugar alcohol; and a disintegrant.A production method of a preparation of rapidly disintegrating which includes a step of production of medicinal Granules comprising a step of forming a coating layer containing sugar or a Sugar Alcohol and a step on the Granules obtained Mix D The coated Granules and a disintegrant, and Molding the mixture.Claim 7: preparation according to claim 5 or 6, characterized in that it is a tablet.Claim 9: preparation for absorption of oral mucosa characterized in that it comprises - (S) - N - [2 - (1,6,7,8 - tetrahydro - 2H - indeno [5,4-b] furan - 8 - il) ethyl] propionamide as a drug; it shows a higher proportion of the Medicine in an unmodified form and a metabolite the medicame Nto after transfer into the blood rather than oral administration.Claim 24: a drug for prophylaxis and / or treatment of bipolar disorder, characterised in that it comprises, as an active ingredient, (S) - N - [2 - (1,6,7,8 - tetrahydro - 2H - indeno [5,4-b] furan - 8 - il) ethyl] propionamide for oral administration. Mucosa to a human being.Una preparación con una propiedad de desintegración mejorada, una preparación que muestra una biodisponibilidad mejorada de un medicamento, los métodos de producción de la misma y similares. Una preparación de desintegración rápida que comprende gránulos que comprenden el medicamento recubierto con una capa de recubrimiento que contiene azúcar o un alcohol de azúcar; y un desintegrante. Un método de producción de una preparación de desintegración rápida que incluye un paso de producción de gránulos que comprenden el medicamento, un paso de formación de una capa de recubrimiento que contiene azúcar o un alcohol de azúcar sobre los gr