| Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using alfuzosin and call your doctor at once if you have a serious side effect such as:
new or worsening chest pain;
nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
feeling like you might pass out; or
penis erection that is painful or lasts 4 hours or longer.
Less serious side effects
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