RESUMEN
<p><b>OBJECTIVES</b>To supply clinical data for drug selextion in the treatment of erectile dysfunction through intracavernosal injection.</p><p><b>METHODS</b>Fifty-six ED patients were randomly classified into 2 groups and received phentolamine along with papaverine (for group 1) or phentolamine, papaverine and ligustrazin hydrochloride(for group 2).</p><p><b>RESULTS</b>Patients in group 2 enjoyed a longer time of erection. More patients in group 2 succeeded in having enough erection time and hardness to complete sexual intercourse (P < 0.05).</p><p><b>CONCLUSIONS</b>The extrainjection of ligustrazin hydrochloride injection can help prolong erection duration and hardness and reduce tubercles that might occur in the corpus carvernosal. Therefore it is a safe and inexpensive drug in the intracarvernous injection treatment.</p>