Yes you may. My husband is 62. He has experienced impotency since his later 40's. He used the shots back then, they worked great, since then they were discontinued. He has tried all the pills, with little success. He has been to several urologists, the last one prescribed the new injections called caverject, 20mcg. They produce an erection for about a minute so they do not last. He has tried taking one of the different pills also, but to no avail. He can get an erection, but it will not maintain. Is there anything else we can do?