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Generic vs Brand Drugs

Generic vs Brand Drugs

Old Nov 12th 2003, 4:22 pm
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Default Generic vs Brand Drugs

In Pharmacology, all drugs have two names - a trade name and a generic name. For example, the trade name of Tylenol also has the generic name of Acetominophen. Aleve is called Naproxen. Amoxil is also called Amoxicillin and Advil is also called Ibuprofen. The FDA has been looking for a generic name for Viagra. After careful consideration by a team of government experts, it recently announced that it has settled on the generic name of mycoxafloppin. Also considered were mycoxafailin, mydixadrupin, mydixadud, dixafix and, of course, ibepokin.
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Old Nov 13th 2003, 1:05 am
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Default Re: Generic vs Brand Drugs

What about sildenafil citrate?
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Old Nov 13th 2003, 3:06 am
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What about it? THIS about it......
The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation. NO then activates the enzyme guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood. Sildenafil has no direct relaxant effect on isolated human corpus cavernosum, but enhances the effect of nitric oxide (NO) by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. When sexual stimulation causes local release of NO, inhibition of PDE5 by sildenafil causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.

Studies in vitro have shown that sildenafil is selective for PDE5. Its effect is more potent on PDE5 than on other known phosphodiesterases (80-fold for PDE1, 1000-fold for PDE2, PDE3, and PDE4). The approximately 4000-fold selectivity for PDE5 versus PDE3 is important because that PDE is involved in control of cardiac contractility. Sildenafil is only about 10-fold as potent for PDE5 compared to PDE6, an enzyme found in the retina; this lower selectivity is thought to be the basis for abnormalities related to color vision observed with higher doses or plasma levels (see Pharmacodynamics).

In addition to human corpus cavernosum smooth muscle, PDE5 is also found in lower concentrations in other tissues including platelets, vascular and visceral smooth muscle, and skeletal muscle. The inhibition of PDE5 in these tissues may be the basis for the enhanced platelet antiaggregatory activity of nitric oxide observed in vitro, an inhibition of platelet thrombus formation in vivo and peripheral arterial-venous dilatation in vivo.


This is the real generic name for the brand of Viagra.
 
Old Nov 13th 2003, 3:17 am
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I was just about to say the same thing !!
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Old Nov 13th 2003, 3:25 am
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Originally posted by JeanDupont
What about it? THIS about it......
The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation. NO then activates the enzyme guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood. Sildenafil has no direct relaxant effect on isolated human corpus cavernosum, but enhances the effect of nitric oxide (NO) by inhibiting phosphodiesterase type 5 (PDE5), which is responsible for degradation of cGMP in the corpus cavernosum. When sexual stimulation causes local release of NO, inhibition of PDE5 by sildenafil causes increased levels of cGMP in the corpus cavernosum, resulting in smooth muscle relaxation and inflow of blood to the corpus cavernosum. Sildenafil at recommended doses has no effect in the absence of sexual stimulation.

Studies in vitro have shown that sildenafil is selective for PDE5. Its effect is more potent on PDE5 than on other known phosphodiesterases (80-fold for PDE1, 1000-fold for PDE2, PDE3, and PDE4). The approximately 4000-fold selectivity for PDE5 versus PDE3 is important because that PDE is involved in control of cardiac contractility. Sildenafil is only about 10-fold as potent for PDE5 compared to PDE6, an enzyme found in the retina; this lower selectivity is thought to be the basis for abnormalities related to color vision observed with higher doses or plasma levels (see Pharmacodynamics).

In addition to human corpus cavernosum smooth muscle, PDE5 is also found in lower concentrations in other tissues including platelets, vascular and visceral smooth muscle, and skeletal muscle. The inhibition of PDE5 in these tissues may be the basis for the enhanced platelet antiaggregatory activity of nitric oxide observed in vitro, an inhibition of platelet thrombus formation in vivo and peripheral arterial-venous dilatation in vivo.


This is the real generic name for the brand of Viagra.

Thats a mouthful!
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Old Nov 16th 2003, 11:55 am
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Originally posted by JeanDupont
......the real generic name for the brand of Viagra.
.... is sildenafil citrate.
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