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What is the chemical formula of viagra. charset=UTF-8"> Chemical: Enter a chemical name, CAS Number, or molecular formula. Synonyms: 1-((3-(6,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo(4,3-d)pyrimidin-5-yl)-4-ethoxyphenyl)sulfonyl)-4-methylpiperazine citrate (1:1), 139755-83-2, 171599-83-0, Caverta, Caverta (TN), D02229, LS-111685, Patrex, Penegra, Piperazine, 1-((3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo(4,3-d)pyrimidin-5-yl)-4-ethoxyphenyl)sulfonyl)-4-methyl-, 2-hydroxy-1,2,3-propanetricarboxylate (1:1), Revatio, Sildenafil citrate, Sildenafil citrate (JAN USAN), Sildenafil citrate USAN , UK 92480-10, UK-92480, UK-92480-10, VIAGRA, Viagra (TN), Wan Ai Ke click for details Search for: VIAGRA IUPAC Name4- 2-ethoxy-5-(4-methylpiperazin-1-yl)sulfonyl-phenyl -9-methyl-7-propyl-3,5,8,9-tetrazabicyclo 4.3.0 nona-3,7,10-trien-2-one; 2-hydroxypropane-1,2,3-tricarboxylic acid CAS Number171599-83-0 Chemical FormulaC28H38N6O11S Search web sites for VIAGRA Find suppliers Find resources previous next Featured Suppliers (Ads.) Popular Chemicals A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Popular searches Popular searches by subject Resources Market research ChemWeb - chemistry portal Chemistry jobs The Alchemist Useful Sources newsletter Useful Sources archive Free newsletters Free magazines Latest Science Articles More chemical info resources Recommend ChemIndustry.com to your friends. Home Advertising Job Opportunities Newsletter Manage Account Subscription Center Add ChemIndustry.com to your site About Us Privacy Policy Terms Contact Us Chinese English (c) 1999-2008 ChemIndustry.com, Inc. & 149 All Rig what is		  

Viagra (sildenafil citrate) drug information: uses, side effects

Mewhat limited, and users are directed to take the pill at least thirty minutes and no more than four hours before, erm, making use of its effects. Given the degree to which sexual intercourse is considered to properly be an impulsive, passionate, unplanned activity, users may find these constraints limiting. For the horndog in a rush, Viagra can be insufflated to produce more immediate effects, but there is yet no clear way to extend its period of effect aside from repeated administration, which may aggravate unwanted or dangerous side effects. Those interested in prolonged periods of effect may want to consider Viagra's newer competitor Cialis, nicknamed "the weekender" for its 36-hour effective duration. Though Viagra has shown benefits in a wide range of users, its legitimation within a medicalized disease treatment framework means that the bulk of the millions of its prescriptions written yearly go to older men. However, not all users acquire Viagra in this manner. Viagra's popularity even among those who might not consider themselves recreational drug users is considered a major factor in the growth of "internet pharmacies" - online retail operations, often hosted on flag of convenience servers, selling medications with only the most perfunctory (if any) nods towards legal requirements regarding physician approval. In the face of lingering taboos regarding discussion of the genitals and a culture in which weakness of erection is often considered symbolic of low value and failure as a male, the anonymity these services offer can't hurt, either. Viagra is such a staple what is


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what is the chemical formula of viagra Onsistent with ritonavir's marked effects on a broad range of P450 substrates. VIAGRA had no effect on ritonavir pharmacokinetics (see DOSAGE AND ADMINISTRATION). Although the interaction between other protease inhibitors and sildenafil has not been studied what is the chemical formula of viagra, their concomitant use is expected to increase sildenafil levels. In a study of healthy male volunteers what is the chemical formula of viagra, co-administration of sildenafil at steady state (80 mg t.i.d.) with endothelin receptor antagonist bosentan (a moderate inducer of CYP3A4 what is the chemical formula of viagra, CYP2C9 and possibly of cytochrome P450 2C19) at steady state (125 mg b.i.d.) resulted in a 63% decrease of sildenafil AUC and a 55% decrease in sildenafil Cmax. Concomitant administration of strong CYP3A4 inducers what is the chemical formula of viagra, such as rifampin what is the chemical formula of viagra, is expected to cause greater decreases in plasma levels of sildenafil. Single doses of antacid (magnesium hydroxide aluminum hydroxide) did not affect the bioavailability of VIAGRA. Pharmacokinetic data from patients in clinical trials showed no effect on sildenafi what is the chemical formula of viagra.

what is the chemical formula of viagra Afil what is the chemical formula of viagra, trade name VIAGRATM what is the chemical formula of viagra, chemical name 5- 2-ethoxy-5-(4-methylpiperazin-1-ylsulfonyl)phenyl -1- methyl-3-propyl-1 what is the chemical formula of viagra, 6-dihydro-7H-pyrazolo 4 what is the chemical formula of viagra, 3-d pyrimidin-7-one what is the chemical formula of viagra, formula C22H30N6O4S what is the chemical formula of viagra, was discovered through a rational drug design programme by the pharmaceutical company Pfizer. It is a potent selective inhibitor of the enzyme phosphodiesterase (PDE-5) what is the chemical formula of viagra, which destroys cyclic guanosine monophosphate (cGMP) what is the chemical formula of viagra, itself a dilator of blood vessels in the body. Viagra thus allows cyclic GMP to persist and this property has led to its use for the oral treatment of male erectile dysfunction (N. K. Terrett what is the chemical formula of viagra, A. S. Bell what is the chemical formula of viagra, D. Brown what is the chemical formula of viagra, P. Ellis Bioorganic & Medicinal Chem. Lett. what is the chemical formula of viagra, 1996 what is the chemical formula of viagra, 6 what is the chemical formula of viagra, pp.1819-1824). It is adminstered as the citrate. The structures below were modelled using a program called Chem3D from CambridgeSoft what is the chemical formula of viagra, using molecular mechanics (MM2) and quantum mechanics (AM1 what is the chemical formula of viagra, PM3) methods. In all cases what is the chemical formula of viagra, the 6-H tautomer was found to be lower in energy than the 4-H isomer by about 4-8 kcal mol. To view.

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what is the chemical formula of viagra Ich may predispose them to priapism, and may be advisable in those with bleeding disorders or active peptic ulceration. The safety of sildenafil is uncertain in patients with hypotension, a recent history of stroke or myocardial infarction, or retinal disorders such as retinitis pigmentosa (a minority of whom have genetic disorders of retinal phosphodiesterases). Patients who experience dizziness or visual disturbances should not drive or operate hazardous machinery. INTERACTIONS Sildenafil is contra-indicated in anyone taking organic nitrates as it may potentiate their hypotensive effects. Concomitant administration of sildenafil with drugs that inhibit cytochrome CYP3A4, such as cimetidine, may reduce sildenafil clearance. PHARMACOKINETICS Sildenafil is rapidly absorbed following administration by mouth, with a bioavailability of approximately 40%. Peak plasma concentrations are attained within 30 to 120 minutes; the rate of absorption is reduced when sildenafil is administered with