title: I have a heart condition. Is it OK for me to take Viagra (sildenafil)?
mesh_terms: D015106:3',5'-Cyclic-GMP Phosphodiesterases; D000075202:Contraindications; D006801:Humans; D008297:Male; D005996:Nitroglycerin; D010879:Piperazines; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014665:Vasodilator Agents
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D000068677:Sildenafil Citrate; D015106:3',5'-Cyclic-GMP Phosphodiesterases; D005996:Nitroglycerin