Patent ID: 8323691

Claim:
A method of detecting the formulation orientation of a multi-layer capsule-shaped osmotic tablet comprising a first layer containing a drug ingredient and a second layer containing a drug ingredient, wherein at least one of the first and second layers comprises a first colorant; a further layer containing a second colorant that is distinguishable from the first colorant or no color, the further layer not containing any drug ingredient; wherein the first layer is located at one end of the tablet, the further layer is located at the other end of the tablet, and the second layer is located between the first layer and the further layer, such that the formulation orientation of the tablet can be determined by detecting the color at a spot location on a side of the tablet corresponding to one or another differently colored layer depending on the formulation orientation of the tablet; the method comprising the steps of: detecting the color at a spot location on a side of the tablet corresponding to one or another layer depending on the formulation orientation of the tablet; and determining the formulation orientation of the tablet on the basis of the color detected.