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Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4] [8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9]
The expiration date of pharmaceuticals specifies the date the manufacturer guarantees the full potency and safety of a drug. Most medications continue to be effective and safe for a time after the expiration date. A rare exception is a case of renal tubular acidosis purportedly caused by expired tetracycline. [9]
Most of the time, Viagra begins to work 30 to 60 minutes after taking it. It may work more slowly if you take it after eating a fatty meal. So make sure that you strategically pop that little blue ...
Whether you’re one of the 30 million men who have (ED) or not, you’ve almost certainly heard of Viagra. Maybe you even know about other ED medications, like Levitra or Stendra or Cialis, too.
Chemical structure of sildenafil (Viagra), the prototypical PDE5 inhibitor. A phosphodiesterase type 5 inhibitor (PDE5 inhibitor) is a vasodilating drug that works by blocking the degradative action of cGMP-specific phosphodiesterase type 5 (PDE5) on cyclic GMP in the smooth muscle cells lining the blood vessels supplying various tissues.
If you struggle with ED, drugs like Viagra®, sildenafil, tadalafil, and other FDA-approved medications could help with your performance. But if you’re not prescribed one of these meds, taking ...
For example, a small study of 20 people that looked into Viagra’s effect on refractory time found that a standard 100mg dose of sildenafil citrate reduced the average male post-intimacy recovery ...
Range-Finding in the Army. How to use range-finders to get results: the erect and inverted types, Popular Science monthly, February 1919, page 118–120, Scanned by Google Books; Electro Optic Application Test Equipment, Berkeley Nucleonics Corporation, archived from the original on 2011-07-11