| http://www.w3.org/ns/prov#value | - If these effects persist or worsen, notify your doctor promptly.PrecautionBefore using this drug, inform your doctor your medical history, including any allergies (especially drug allergies), any penis conditions such as fibrosis/scarring, history of painful/prolonged erection (priapism), sickle cell anemia, blood system cancers (such as leukemia or myeloma), or Peyronie's disease, eye problems (r
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