SN instructed patient / caregiver on medication Flomax. SN explained that Flomax is indicated for urinary retention such as the case in people who have prostate enlargement. SN explained that side effects of Flomax includes arthralgia, dizziness, flushing, headache, nausea and vomiting. SN instructed patient / caregiver to notify physician ( MD ) if experiencing persistent urinary retention and if experiencing the side effects of this medication persistently.