| gptkbp:instanceOf | gptkb:brand gptkb:drug
 
 | 
                        
                            
                                | gptkbp:activeIngredient | gptkb:vardenafil 
 | 
                        
                            
                                | gptkbp:approvalYear | 2003 
 | 
                        
                            
                                | gptkbp:approvedBy | gptkb:European_Medicines_Agency gptkb:U.S._Food_and_Drug_Administration
 
 | 
                        
                            
                                | gptkbp:ATCCode | gptkb:G04BE09 
 | 
                        
                            
                                | gptkbp:chemicalFormula | C23H32N6O4S 
 | 
                        
                            
                                | gptkbp:contraindication | nitrate medications recent heart attack
 recent stroke
 severe liver impairment
 
 | 
                        
                            
                                | gptkbp:drugClass | gptkb:PDE5_inhibitor 
 | 
                        
                            
                                | gptkbp:form | 10 mg 20 mg
 5 mg
 
 | 
                        
                            
                                | gptkbp:genericAvailable | yes 
 | 
                        
                            
                                | gptkbp:halfLife | 4-5 hours 
 | 
                        
                            
                                | gptkbp:legalStatus | prescription only 
 | 
                        
                            
                                | gptkbp:manufacturer | gptkb:Bayer gptkb:Schering-Plough
 GlaxoSmithKline
 
 | 
                        
                            
                                | gptkbp:marketedIn | gptkb:European_Union gptkb:United_States
 
 | 
                        
                            
                                | gptkbp:mechanismOfAction | inhibits phosphodiesterase type 5 (PDE5) 
 | 
                        
                            
                                | gptkbp:pregnancyCategory | Not for use in women 
 | 
                        
                            
                                | gptkbp:prescribes | adult men 
 | 
                        
                            
                                | gptkbp:prescriptionRequired | yes 
 | 
                        
                            
                                | gptkbp:routeOfAdministration | oral 
 | 
                        
                            
                                | gptkbp:sideEffect | dizziness headache
 nasal congestion
 dyspepsia
 flushing
 
 | 
                        
                            
                                | gptkbp:storage | room temperature 
 | 
                        
                            
                                | gptkbp:usedFor | erectile dysfunction 
 | 
                        
                            
                                | gptkbp:bfsParent | gptkb:Bayer 
 | 
                        
                            
                                | gptkbp:bfsLayer | 5 
 | 
                        
                            
                                | https://www.w3.org/2000/01/rdf-schema#label | Levitra 
 |