Hi, Thanks for posting in HCM. I understand your concern. Lisinopril is an ACE (angiotensin converting enzyme) inhibitor, which works by relaxing blood vessels. It is used to treat high blood pressure (hypertension) or congestive heart failure. Common side effects associated with its use include: Dizziness, lightheadedness, diarrhoea, tiredness, headache, hyperkalemia (raised potassium levels) and dry cough. Its involvement in causing impotence is uncommon (0.1% to 1%) and gynecomastia is rare (less than 0.1%). It is not known to cause male infertility by making sperms unable to fertilize the egg. Hence, let your husband take the medication as advised and do necessary follow-up, without worrying much about it causing infertility or impotence. Hope the information provided would be helpful. All the best.