Formulations of viloxazine

1. A pharmaceutical formulation, comprising:

(a) an immediate release (IR) component comprising an inert core and a layer comprising viloxazine and, optionally, a pharmaceutically acceptable excipient, surrounding the core, and

(b) an extended release (XR) component comprising: (i) an inert core, (ii) a first layer comprising viloxazine and, optionally, a pharmaceutically acceptable excipient, surrounding the core, and (iii) a second layer comprising a release rate controlling compound and a pore former in a weight ratio of 19:1 to 8.5:1.5, respectively, surrounding the first layer,

wherein the pore former is selected from the group consisting of povidone, hypromellose, hydroxyethyl cellulose, hydroxypropyl cellulose, and organic acids,

wherein the release rate controlling compound is selected from the group consisting of ethylcellulose; cellulose acetate; cellulose acetate butyrate; waxes; hydrogenated vegetable oils; glyceryl behenate; glyceryl palmitostearate; PEG glyceryl esters; poly(ethyl acrylate-co-methyl methacrylate) ethyl acrylate methyl methacrylate copolymer; poly(ethyl acrylate-co-methyl methacrylate-cotrimethylammonioethyl methacrylate chloride); polyvinyl acetate; cellulose acetate propionate, and combinations thereof, and is present in an amount of from 5% (w/w) to 65% (w/w) of the XR component,

wherein the formulation comprises, as a percentage of the total formulation, 25% (w/w) to 75% (w/w) viloxazine,

wherein the viloxazine is released immediately and continuously upon administration, and

wherein at least 80% of the viloxazine or salt thereof in the formulation is released from the formulation over a period of time of at least 2 hours in vitro.

2. The formulation of claim 1 , further comprising a hydrophilic compound that is selected from the group consisting of hydroxypropyl cellulose; hydroxypropyl methyl cellulose; methyl cellulose; polyethylene oxide; acacia; acrylic acid derivatives; alginic acid, its salts and derivatives thereof; hydroxyethyl cellulose; povidone; carrageenan; carboxymethylcellulose; tragacanth; polyvinyl alcohol; xanthan gum, and combinations thereof.

3. The formulation of claim 1 , wherein the release rate controlling compound is selected from the group consisting of ethylcellulose; cellulose acetate; cellulose acetate butyrate; polyvinyl acetate; cellulose acetate propionate, and combinations thereof.

4. The formulation of claim 1 wherein the release rate controlling compound is present in an amount of 5% (w/w) to 18% (w/w) of the extended release component.

5. The formulation of claim 1 , wherein the extended release component is in the form of a plurality of particles.

6. The formulation of claim 1 for once-a-day administration.

7. The formulation of claim 1 for twice-a-day administration.

8. The formulation of claim 1 , comprising from 10 mg to 800 mg of viloxazine.

9. The formulation of claim 1 , wherein the viloxazine comprises viloxazine hydrochloride.

10. The formulation of claim 1 , wherein the formulation provides for a maximum steady state plasma concentration (C max ) of viloxazine which is higher than the minimal therapeutically effective concentration and is in the range of 50% to 125% relative to the maximum plasma concentration produced by administration of viloxazine as an IR formulation TID or BID.

11. The formulation of claim 1 , wherein the formulation provides for relative steady state area under the viloxazine plasma concentration time profiles for a 24 hour dosing interval (AUC tau ) in the range of 80% to 125% as compared to viloxazine administered as an immediate release formulation TID or BID.

12. The formulation of claim 1 in a dosage form selected from tablets, capsules, beads, granules, powders, caplets, troches, sachets, cachets, pouches, and sprinkles.

13. The formulation of claim 1 comprising at least two extended release components, wherein each extended release component has its own rate of release.