N-oxides of venlafaxine and o-desmethylvenlafaxine as prodrugs

Embodiments of the invention relate to a compound of formula (1), or a tautomer, stereoisomer, hydrate, or solvate thereof, wherein R1 is H or CH3. Other embodiments of the invention relate to a pharmaceutical composition containing these compound, to methods for preparing these compounds, and to methods for preparing compositions containing these compounds. Yet other embodiments of the invention relate to the uses of these compounds and compositions containing it, such as for the manufacture of medicaments and pharmaceutical compositions for treating a condition chosen from depression, major depressive disorder, generalized anxiety disorder, obsessive compulsive disorder, social anxiety disorder, panic disorder, general depressive disorders, diabetic neuropathy, migraine and hot flashes.