What is a round yellow pill with 40 on one side and lupin on the other?

The round yellow pill with "40" on one side and "Lupin" on the other is identified as Lisinopril, which is used to treat high blood pressure and heart failure. It belongs to the class of medications known as ACE inhibitors. Lisinopril helps relax blood vessels, making it easier for the heart to pump blood. Always consult a healthcare professional for advice related to medication and its use.