May be constipated: I would increase your fluid intake and eat fruits, vegetable and other fiber rich foods with periodic toilet sittings. Change your positions and take walks. If not improving try an over the counter stool softener. If still no better i would see your doctor. It may be related to the effexor, (venlafaxine) the feeling like you have to pass gas (tenesmus) but i could not find any definitive information.
Answered 2/4/2015
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