SN instructed pt on medication Lisinopril 20mg PO daily for HTN. Side effects include: dizziness due to a drop in blood pressure. Lisinopril can cause nausea, headaches, anxiety, insomnia, drowsiness, nasal congestion, and sexual dysfunction, and Severe allergic reactions (anaphylaxis) and hives may result. Contact the MD as soon as the above signs/symptoms occur.