Uroxatral side effects are generally mild, with the most common manifestations being the development of a headache or a feeling of dizziness. A patient who experiences these adverse reactions chronically or in an excessive manner should report the problem to their local physician. Other side effects that could be problematic and should be discussed with a physician are rapid heartbeats, aching in the joints, breathing impairment, stomach pain, or back pain. Changes in sexual ability may also be a reason to contact medical personnel. In some cases, this can be experienced as a painful or persistent erection, lasting for a longer than normal period of time.