SILDENAFIL CITRATE Impurities

• SILDENAFIL CITRATE EP impurity A
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• Impurity: SILDENAFIL CITRATE EP impurity A
• Chemical Name: 5-[2-Ethoxy-5-[(4-methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-(2-methylpropyl)-7H-pyrazolo[4,3-d]pyrimidin-7-one

• SILDENAFIL CITRATE EP impurity B
• 
• Impurity: SILDENAFIL CITRATE EP impurity B
• Chemical Name: 5-[2-Ethoxy-5-[(4-methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-(2-methylpropyl)-7H-pyrazolo[4,3-d]pyrimidin-7-one

• SILDENAFIL CITRATE EP impurity D
• 
• Impurity: SILDENAFIL CITRATE EP impurity D
• Chemical Name: 4-Ethoxy -3-(6,7-dIhydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid(Demethylpiperazinyl Sildenafil Sulfonic Acid)

• SILDENAFIL Dimer Impurity
• 
• Impurity: SILDENAFIL Dimer Impurity
• Chemical Name: 5-{2-Ethoxy-5-[(4-{[4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1Hpyrazolo[ 4,3-d]pyrimidin-5-yl)phenyl]sulfonyl}piperazino)sulfonyl]phenyl}-1-methyl- 3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrim

• SILDENAFIL Impurity
• 
• Impurity: SILDENAFIL Impurity
• Chemical Name: 4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide

• SILDENAFIL CITRATE Chlorosulfonyl Impurity
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• Impurity: SILDENAFIL CITRATE Chlorosulfonyl Impurity
• Chemical Name: 4-ethoxy-3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzene-1-sulfonyl chloride

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 3-Ethoxy benzoic acid

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 4-Ethoxy benzoic acid 4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 5-(2 Ethoxy phenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3- d]pyrimidine-7-one(Sildenafil Lactam Impurity)

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 1-[[3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-Pyrazolo[4,3-d]pyrimidine-5-yl)-4-ethoxyphenyl]sulfonyl]piperazine(Sildenafil N-desmethyl Metabolite)

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 1-Methyl-4-nitro-3-propyl-1H-pyrazole-5-carboxamide(Sildenafil amide)

• SILDENAFIL CITRATE Impurity
• 
• Impurity: SILDENAFIL CITRATE Impurity
• Chemical Name: 5-{2-Ethoxy-5-[(4-methypiperzino)sulfonyl]phenyl}-3-ethyl-1-methyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-7-one

• SILDENAFIL CITRATE Impurity F
• 
• Impurity: SILDENAFIL CITRATE Impurity F
• Chemical Name: 5-(2-Ethoxy-phenyl)-1-methyl-3-n-propyl-1,6-dihydro-pyrazolo- -[4,3-d]pyrimidin-7-one