Problem: Exercise caution when nonselective α blockers are being combined with other drugs that lower blood pressure; excessive hypotension could result. Drugs of concern include organic nitrates (e.g., nitroglycerin), antihypertensive drugs, and PDE-5 inhibitors used for ED (e.g., sildenafil [Viagra]). Does this mean Nitroglycerin, PDE4 inhibitor casue hypotension? Need Assignment Help?