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Sildenafil citrate
Alias: Viagra
CAS No: 139755-83-2
Purity: 99%
Solubility: Slightly soluble in water, methanol; very slightly soluble in ethanol
Sildenafil is an oral tablet. In most cases, it should be taken about an hour before sexual activity, but it can be taken 30 minutes to 4 hours in advance. Sildenafil has three powerful ingredients: 25 mg, 50 mg and 100 mg.
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Sildenafil citrate, sold as Viagra, Revatio and under various other trade names, is a drug used to treat erectile dysfunction and pulmonary arterial hypertension (PAH).Since becoming available in 1998, sildenafil has been the prime treatment for erectile dysfunction; its primary competitors on the market are tadalafil (Cialis) and vardenafil (Levitra)
In 16 separate 4-24 week trials of men (over 18 years old) who suffered from impotence for longer than 6 months, dosages between 10-200 mgs were administered. Significant improvements in erectile function, including frequency of penetration as well as erection duration post penetration, were reported with Sildenfil treatment compared to the placebo group.
Erections were improved in 72% of the Viagra group verses 18% of the placebo group. In all cases effects were dependant upon dosage and improvement was the greatest when dosage exceeded 100 mgs. Responses were decreased by 40-60% in patients suffering from diabetes and prostatectomy, respectively. Withdrawal rates were less than 5% related to negative side effects and limited response rates
Brand name | Viagra | Cialis | Levitra |
What’s the generic name of this drug? | sildenafil | Tadalafil | vardenafil |
Is a generic version available? | Yes | yes | yes |
What form does it come in? | oral tablet | oral tablet | oral tablet |
What strengths does it come in? | 25 mg, 50 mg, 100 mg | 2.5 mg, 5 mg, 10 mg, 20 mg | 5 mg, 10 mg, 20 mg |
What’s the typical dosage? | 50 mg | 10 mg (when used as needed); 2.5 mg (when used daily) | 10 mg; 5 mg (for men 65 years old and up) |
When do I take it? | 30-60 minutes before sex | 30 minutes before sex | 60 minutes before sex |
How long does it work? | 4 hours | up to 36 hours | 4-5 hours |
How do I store it? | Around room temperature, between 68°F to 77°F (20°C to 25°C) | At 25°C (77°F) | At 25°C (77°F) |