| 1 | 20 mg sildenafil citrate by mouth | [1]  Sildenafil Sildenafil (Sildenafil Citrate) | [1]  Sildenafil 
                
                    Sildenafil
                
             💬
 | [1]  PDE5A PDE5A 💬
 | [3]  Metabolic pathways Metabolic pathways, Purine metabolism, cGMP-PKG signaling pathway 💬 | [1]  86 86 💬
 | 
| 2 | Access program - sildenafil citrate, Viagra, Revatio | [1]  Sildenafil Sildenafil (Sildenafil Citrate) | [1]  Sildenafil 
                
                    Sildenafil
                
             💬
 | [1]  PDE5A PDE5A 💬
 | [3]  Metabolic pathways Metabolic pathways, Purine metabolism, cGMP-PKG signaling pathway 💬 | [1]  86 86 💬
 | 
| 3 | Sildenafil citrate | [1]  Sildenafil Sildenafil (Sildenafil Citrate) | [1]  Sildenafil 
                
                    Sildenafil
                
             💬
 | [1]  PDE5A PDE5A 💬
 | [3]  Metabolic pathways Metabolic pathways, Purine metabolism, cGMP-PKG signaling pathway 💬 | [4]  51 51, 85, 86, 225 💬
 | 
| 4 | Sildenafil citrate (UK-92,480) | [1]  Sildenafil Sildenafil (Sildenafil Citrate) | [1]  Sildenafil 
                
                    Sildenafil
                
             💬
 | [1]  PDE5A PDE5A 💬
 | [3]  Metabolic pathways Metabolic pathways, Purine metabolism, cGMP-PKG signaling pathway 💬 | [1]  86 86 💬
 | 
| 5 | Sodium tanshinone IIA sulfonate diluted with 5% glucose solution,20mg sildenafil citrate by mouth | [2]  Dextrose, unspecified form Dextrose, unspecified form, Sildenafil (Sildenafil Citrate) | [1]  Sildenafil 
                
                    Sildenafil
                
             💬
 | [1]  PDE5A PDE5A 💬
 | [3]  Metabolic pathways Metabolic pathways, Purine metabolism, cGMP-PKG signaling pathway 💬 | [1]  86 86 💬
 |