Can taking irregular blood pressure medication cause erection problems?

Patient: My husband has recently started having problems having erections. He is under a lot of stress at work and I understand that has a lot to with irregular erection problems. He also takes lisinpril, blood pressure medication. Around the same time he started having this problem he also was not taking his blood pressure medication regularly. My question is can taking blood pressure medication irregularly cause erection problems? We have decided to take a break from sex and wait until he feels ready but he constantly worries that he will not be able to have sex ever again! Please help.