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Descarbon Sildenafil

  • CAT Number DCTI-C-077
  • CAS Number 1393816-99-3
  • Molecular Formula C21H30N6O4S
  • Molecular Weight 462.57

Homo Sildenafil

  • CAT Number DCTI-C-094
  • CAS Number 642928-07-2
  • Molecular Formula C23H32N6O4S
  • Molecular Weight 488.61

Hydroxy Homo Sildenafil

  • CAT Number DCTI-C-095
  • CAS Number 139755-85-4
  • Molecular Formula C23H32N6O5S
  • Molecular Weight 504.61

N-(Desmethyl)-tert-butyl Acetate Sildenafil

  • CAS NUMBER 398507-63-6

N-desmethyl N-Benzyl Sildenafil

  • CAT Number DCTI-C-096
  • CAS Number 1446089-82-2
  • Molecular Formula C28H34N6O4S
  • Molecular Weight 550.68

Piperazine N-desmethyl Sildenafil

  • CAT Number DCTI-C-059
  • CAS Number 139755-82-1
  • Molecular Formula C21H28N6O4S
  • Molecular Weight 460.55

Piperazine N-desmethyl Sildenafil D8

  • CAT Number DCTI-A-090
  • CAS Number 1185168-06-2
  • Molecular Formula C21H20D8N6O4S
  • Molecular Weight 468.6

Sildenafil Chlorosulfonyl compound

  • CAT Number DCTI-C-097
  • CAS Number 139756-22-2
  • Molecular Formula C17H19ClN4O4S
  • Molecular Weight 410.87

Sildenafil EP Impurity D

  • CAS NUMBER 1357931-55-5
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General Information

Sildenafil Impurities and Sildenafil 

Daicel Pharma is a reliable source for synthesizing high-quality Sildenafil impurities, like Descarbon Sildenafil, Homo Sildenafil, N-desmethyl N-Benzyl Sildenafil, Sildenafil EP Impurity D, and many more. Daicel Pharma offers a range of Sildenafil impurities that help assess active pharmaceutical ingredients’ quality, stability, and safety. Additionally, Daicel Pharma specializes in custom synthesis of Sildenafil impurities, fulfilling specific client requirements. These high-quality impurities can be shipped worldwide, providing flexibility and convenience to customers.

Sildenafil [CAS: 139755-83-2] is a reversible phosphodiesterase-5 (PDE5) inhibitor that treats erectile dysfunction and pulmonary hypertension. The US FDA approves Sildenafil for treating pulmonary arterial hypertension (PAH) in adults belonging to WHO Group I.

Sildenafil: Use and Commercial Availability   

Sildenafil is a widely used medication with multiple applications. It is primarily known for its effectiveness in treating erectile dysfunction (ED), a condition characterized by the inability to achieve or maintain an erection sufficient for sexual activity. Sildenafil works by inhibiting the enzyme phosphodiesterase-5 (PDE5), which promotes increased blood flow to the penis, facilitating an erection.

This drug is also crucial in treating pulmonary arterial hypertension (PAH). PAH is a type of high blood pressure that affects the arteries in the lungs and the right side of the heart. Sildenafil helps relax and dilate the blood vessels in the lungs, reducing heart workload and improving exercise capacity in patients with PAH.

Sildenafil is available under the brand names Liqrev, Revatio, and Viagra, which adequately contains the active ingredient, Sildenafil.

Sildenafil Structure and Mechanism of Action Sildenafil Structure and Mechanism of Action

The chemical name of Sildenafil is 5-[2-Ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one. Its chemical formula is C22H30N6O4S, and its molecular weight is approximately 474.6 g/mol.

Sildenafil enhances the effect of nitric oxide (NO) in the corpus cavernosum. It inhibits phosphodiesterase type 5 (PDE5), which causes the radiation of cGMP in the corpus cavernosum. Sildenafil increases cyclic guanosine monophosphate (cGMP) in the corpus cavernosum leading to smooth muscle relaxation and the inflow of blood to the corpus cavernosum.

Sildenafil Impurities and Synthesis

During the manufacturing1 of Sildenafil, the formation of impurities is possible, which can compromise its effectiveness. These impurities can arise from various sources, including the raw materials, intermediates, and chemicals utilized to synthesize Sildenafil. Close management and monitoring of impurities are paramount to ensure the drug’s optimal efficacy and safety.

Daicel Pharma offers a wholesome and integrated Certificate of Analysis (CoA) for Sildenafil impurity standards, encompassing impurities such as Descarbon Sildenafil, Homo Sildenafil, N-desmethyl N-Benzyl Sildenafil, Sildenafil EP Impurity D, and many others. The CoA provides detailed characterization data, including 1H NMR, 13C NMR, IR, MASS, and HPLC purity2. Additionally, we give a complete 13C-DEPT on delivery. With advanced technology and expertise, we can synthesize any unknown Sildenafil impurity or degradation product. Daicel Pharma also supplies labeled compounds, facilitating the quantification of generic Sildenafil’s efficacy. For bioanalytical research and BA/BE studies, Daicel Pharma offers Sildenafil– D3, Sildenafil-D8, and Piperazine N-desmethyl Sildenafil D8, deuterium-labeled standards of Sildenafil.


Frequently Asked Questions

Impurities in Sildenafil can affect its quality, safety, and efficacy. Depending on the type and level of impurities, they can impact the drug's pharmacological activity and stability and pose potential risks to patient health.

Impurities in Sildenafil are detected and quantified using analytical techniques such as HPLC-MS using Electrospray positive ionization. This method will allow for accurate identification and quantification of impurities.

Manufacturers can implement various measures to control impurity levels in Sildenafil, including using high-quality starting materials, optimizing synthesis and purification processes, conducting thorough quality control tests, and monitoring impurity levels throughout the manufacturing process.

Generally, Sildenafil Impurities are stored at a controlled room temperature between 2-8°C or as indicated on the Certificate of Analysis (CoA).

Note: Products protected by valid patents by a manufacturer are not offered for sale in countries having patent protection. The sale of such products constitutes a patent infringement, and its liability is at the buyer's risk.

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