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Hi there. This is not something that one would expect with Effexor.
While there is a wide range of possible side effects with Effexor, and everyone is different as to how they might respond to it, it is far more likely that something you are eating or drinking is causing your urine to stink.
Are you experiencing any other changes in your urine, such as the color, the volume, frequency, etc?
Also, are you drinking less fluids? Normally, urine that contains a lot of water has little to no odor. If your urine becomes highly concentrated — a high level of waste products with little water — urine odor may have a strong ammonia smell.
Keep in mind also that foul smelling urine may be a sign of an infection in the blader, or a high level of ketones in the blood such as occurs with diabetes sometimes.
Many foods, such as asparagus, and certain vitamins, are also known to affect the odor of urine.