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Research shows that, when used properly, these ED pills can help improve function. Many of these pills work fairly quickly. Sildenafil (Viagra), tadalafil (Cialis) and vardenafil (Levitra ...
Viagra dosage can vary by person but is available in three doses: 25mg, 50mg and 100mg doses, with the 50mg option being the usual starting dose. This usual starting dose of 50mg is taken one hour ...
It depends who you ask. One of the main reasons people consider Cialis to be “better” than Viagra is that Cialis lasts longer. Cialis can last for up to 36 hours per dose, whereas a single ...
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]
Vardenafil's indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate (Viagra) and tadalafil (Cialis). The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ...
Tadalafil is an annulated 2,5-diketopiperazine. [25] It is also a 1,2,3,4-tetrahydro-β-carboline. Tadalafil can be synthesized starting from (D)-tryptophan methyl ester and piperonal via a Pictet–Spengler reaction. This is followed by condensations with chloroacetyl chloride and methylamine to complete the diketopiperazine ring: [26]
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