Sildenafil Citrate

Short Description:

CAS No.: 171599-83-0
Other Names: Viagra
MF: C28H38N6O11S
Place of Origin: Hubei, China (Mainland)
Grade Standard: Medicine Grade
Model Number: USP
Purity: 99%
colour: white
shelf life: 2 years


CAS No.: 171599-83-0
Other Names: Viagra
MF: C28H38N6O11S
Place of Origin: Hubei, China (Mainland)
Grade Standard: Medicine Grade
Model Number: USP
Purity: 99%
colour: white
shelf life: 2 years

Sildenafil, sold as Viagra and other trade names, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension.Its use for sexual dysfunction in women is not clear.

Common side effects include headaches and heart burn, as well as flushed skin. Caution is advised in those who have cardiovascular disease. Rare but serious side effects include prolonged erections, which can lead to damage to the penis, and sudden-onset hearing loss. Sildenafil should not be taken by people who take nitrates such as nitroglycerin, as this may result in a severe and potentially fatal drop in blood pressure.

It acts by inhibiting cGMP-specific phosphodiesterase type 5 (PDE5), an enzyme that promotes degradation of cGMP, which regulates blood flow in the penis.

It was originally discovered by Pfizer scientists Andrew Bell, David Brown, and Nicholas Terrett.Since becoming available in 1998, sildenafil has been a common treatment for erectile dysfunction; its primary competitors are tadalafil (Cialis) and vardenafil (Levitra).


Test items Specifications Results
Characteristics White or almost white crystalline powder Complies
Identification Uv Complies
Loss on drying ≤0.5% 0.3%
Residue on ignition ≤0.1% 0.06%
Heavy metal ≤10ppm Complies
Melting point 230-240℃ 235-238℃
Relative substance Total impurity ≤0.5% 0.37%
TLC Only one spot Only one spot
Assay(on dried basis) 99.0%min 99.8%
Conclusion:    The product complies with the USP 32 standard


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