Viagra is a brand name of sildenafil, approved by the FDA in the following formulation(s):
VIAGRA (sildenafil citrate - tablet; oral)
Manufacturer: PFIZER IRELAND
Approval date: March 27, 1998
Strength(s): EQ 100MG BASE [RLD], EQ 25MG BASE, EQ 50MG BASE
Has a generic version of Viagra been approved?
No. There is currently no therapeutically equivalent version of Viagra available.
Note: Fraudulent online pharmacies may attempt to sell an illegal generic version of Viagra. These medications may be counterfeit and potentially unsafe. If you purchase medications online, be sure you are buying from a reputable and valid online pharmacy. Ask your health care provider for advice if you are unsure about the online purchase of any medication.
See also: About generic drugs.
Related Patents
Patents are granted by the U.S. Patent and Trademark Office at any time during a drug's development and may include a wide range of claims.
Pyrazolopyrimidinone antianginal agents
Patent 5,250,534
Issued: October 5, 1993
Inventor(s): Bell; Andrew S. & Brown; David & Terrett; Nicholas K.
Assignee(s): Pfizer Inc.
Compounds of the formula: ##STR1## wherein R.sup.1 is H, C.sub.1 -C.sub.3 alkyl, C.sub.3 -C.sub.5 cycloalkyl or C.sub.1 -C.sub.3 perfluoroalkyl; R.sup.2 is H, C.sub.1 -C.sub.6 alkyl optionally substituted by OH, C.sub.1 -C.sub.3 alkoxy or C.sub.3 -C.sub.6 cycloalkyl, or C.sub.1 -C.sub.3 perfluoroalkyl; R.sup.3 is C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 alkenyl, C.sub.3 -C.sub.6 alkynyl, C.sub.3 -C.sub.7 cycloalkyl, C.sub.1 -C.sub.6 perfluoroalkyl or (C.sub.3 -C.sub.6 cycloalkyl)C.sub.1 -C.sub.6 alkyl; R.sup.4 taken together with the nitrogen atom to which it is attached completes a pyrrolidinyl, piperidino, morpholino, or 4-N-(R.sup.6)-piperazinyl group; R.sup.5 is H, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.3 alkoxy, NR.sup.7 R.sup.8, or CONR.sup.7 R.sup.8 ; R.sup.6 is H, C.sub.1 -C.sub.6 alkyl, (C.sub.1 -C.sub.3 alkoxy) C.sub.2 - C.sub.6 alkyl, hydroxy C.sub.2 -C.sub.6 alkyl, (R.sup.7 R.sup.8 N)C.sub.2 -C.sub.6 alkyl, (R.sup.7 R.sup.8 NCO)C.sub.1 -C.sub.6 alkyl, CONR.sup.7 R.sup.8, CSNR.sup.7 R.sup.8 or C(NH)NR.sup.7 R.sup.8 ; R.sup.7 and R.sup.8 are each independently H, C.sub.1 -C.sub.4 alkyl, (C.sub.1 -C.sub.3 alkoxy)C.sub.2 -C.sub.4 alkyl or hydroxy C.sub.2 -C.sub.4 alkyl; and pharmaceutically acceptable salts thereof, are selective cGMP PDE inhibitors useful in the treatment of cardiovascular disorders such as angina, hypertension, heart failure and atherosclerosis.Patent expiration dates:
- March 27, 2012
- September 27, 2012✓
- March 27, 2012
Pyrazolopyrimidinones for the treatment of impotence
Patent 6,469,012
Issued: October 22, 2002
Inventor(s): Peter; Ellis & Nicholas Kenneth; Terrett
Assignee(s): Pfizer Inc
The use of a compound of formula (I) wherein R1 is H; C1-C3 alkyl; C1-C3 perfluoroalkyl; or C3-C5 cycloalkyl; R2 is H; optionally substituted C1-C6 alkyl; C1-C3 perfluoroalkyl; or C3-C6 cycloalkyl; R3 is optionally substituted C1-C6 alkyl; C1-C6 perfluoroalkyl; C3-C5 cycloalkyl; C3-C6 alkenyl; or C3-C6 alkynyl; R4 is optionally substituted C1-C4 alkyl, C2-C4 alkenyl, C2-C4 alkanoyl, (hydroxy)C2-C4 alkyl or (C2-C3 alkoxy)C1-C2 alkyl; CONR5R6; CO2R7; halo; NR5R6; NHSO2NR5R6; NHSO2R8; SO2NR9R10; or phenyl, pyridyl, pyrimidinyl, imidazolyl, oxazolyl, thiazolyl, thienyl or triazolyl any of which is optionally substituted with methyl; R5 and R6 are each independently H or C1-C4 alkyl, or together with the nitrogen atom to which they are attached form an optionally substituted pyrrolidinyl, piperidino, morpholino, 4-N(R11)-piperazinyl or imidazolyl group; R7 is H or C1-C4 alkyl; R8 is optionally substituted C1-C3 alkyl; R9 and R10 together with the nitrogen atom to which they are attached form an optionally substituted pyrrolidinyl, piperidino, morpholino or 4-N(R12)-piperazinyl group; R11 is H; optionally substituted C1-C3 alkyl; (hydroxy)C2-C3 alkyl; or C1-C4 alkanoyl; R12 is H; optionally substituted C1-C6 alkyl; CONR13R14; CSNR13R14; or C(NH)NR13R14; and R?13? and R14 are each independently H; C1-C4 alkyl; or substituted C2-C4 alkyl; or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing either entity, for the manufacture of a medicament for the curative or prophylactic treatment of erectile dysfunction in a male animal, including man; a pharmaceutical composition for said treatment; and a method of said treatment of said male animal with said pharmaceutical composition or with said either entity.Patent expiration dates:
- October 22, 2019✓
- April 22, 2020✓
- October 22, 2019
See also...
- Viagra Consumer Information (Drugs.com)
- Viagra Consumer Information (Wolters Kluwer)
- Viagra Consumer Information (Cerner Multum)
- Viagra Advanced Consumer Information (Micromedex)
- Sildenafil Consumer Information (Wolters Kluwer)
- Sildenafil Injection Consumer Information (Wolters Kluwer)
- Sildenafil Consumer Information (Cerner Multum)
- Sildenafil Advanced Consumer Information (Micromedex)
- Sildenafil Intravenous Advanced Consumer Information (Micromedex)
- Sildenafil Citrate AHFS DI Monographs (ASHP)
