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In short-term priapism (< 6 h), especially for drug-induced priapism, intracavernosal injection of phenylephrine alone may result in detumescence. Use a mixture of 1 ampule of phenylephrine (1 mL:1000 mcg) and dilute it with an additional 9 mL of normal saline. Using a 29-gauge needle, inject 0.3-0.5 mL into the corpora cavernosa, waiting 10-15 minutes between injections. Vital signs should be monitored, and compression should be applied to the area of injection to help prevent hematoma formation.