All medications may cause side effects, but usually patients have no, or minor, side effects. Common side effects of UROXATRAL may include: mild dizziness, headache, tired feeling, cold symptoms such as stuffy nose, sneezing, sore throat allergic reactions (hives, difficulty breathing, swelling of your face, lips, tongue, or throat), chest pain, nausea, stomach pain, low fever, loss of appetite, dark urine and/or clay-colored stools, jaundice (yellowing of the skin or eyes), feeling like you might pass out, penis erection that is painful or lasts 4 hours or longer