Pharmaceutical presentations or phenoxathiin-based MAO-A inhibitors are disclosed whereby the MAO receptors are capable of sustained release in the digestive tract. Particular phenoxathiin-based MAO-A inhibitors include those of the following formula: wherein n is 0, 1 or 2 R1 is a branched or straight chain C1-5 alkyl or C3-6 cycloalkyl optionally substituted with hydroxyl, or one or more halogens and X1, X2, X3, X4, and X5 are either all hydrogens or one or two of X1, X2, X3, X4, and X5 are halogen and the remainder are hydrogens, with the proviso that when n is 0 or 1 and each X is hydrogen, R1 is not methyl. A wide variety or sustained release mechanisms can be utilized so as to provide gradual release of the active ingredient after ingestion as a pharmaceutical presentation, such as a tablet or capsule. Presentations include sustained release tablets, sustained release capsules, capsules containing sustained release beads.
