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Sildenafil citrate powder, also known as sildenafil citrate, has the molecular formula C28H38N6O11S, a molecular weight of 666.700, and CAS 171599-83-0. It is a white or almost white crystalline powder with extremely high purity. The density is approximately 1.445g/cm ³ (There is also data at 1.447g/cm) ³), This density value is relatively high, indicating strong intermolecular forces and tight molecular arrangement. This property has a certain impact on the solubility and pharmacological release of drugs. In terms of safety, it is classified as a dangerous goods symbol Xi, which means that attention should be paid to its potential irritancy and corrosiveness when using it. In addition, solubility in water is also an important physical property that determines the absorption and distribution of drugs in the body.
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Chemical Formula |
C28H38N6O11S |
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Exact Mass |
666 |
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Molecular Weight |
667 |
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m/z |
666 (100.0%), 667 (30.3%), 668 (4.5%), 668 (2.7%), 668 (2.3%), 667 (2.2%), 668 (1.7%), 669 (1.4%) |
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Elemental Analysis |
C, 50.44; H, 5.75; N, 12.61; O, 26.40; S, 4.81 |
Sildenafil citrate (trade name Viagra), as the world's first approved phosphodiesterase 5 (PDE5) inhibitor, has become a core drug for the treatment of male erectile dysfunction (ED) since its launch in 1998. Its mechanism of action involves inhibiting PDE5 enzyme activity, reducing the degradation of cyclic guanosine monophosphate (cGMP), promoting the relaxation of smooth muscle in the corpus cavernosum of the penis, increasing local blood flow perfusion, and thus helping patients achieve and maintain erections. In addition to ED treatment, this drug has also shown significant efficacy in the fields of pulmonary arterial hypertension, cardiovascular protection, and specific psychological disorders.
1. Treatment of Organic ED
For organic ED caused by chronic diseases such as diabetes, hypertension and atherosclerosis, sildenafil citrate has become a first-line treatment plan by directly improving the blood flow of the penis cavernous body. The study shows that among ED patients with diabetes, 50 mg can make 63% of patients achieve successful sexual intercourse, which is significantly higher than 25% of the placebo group. Its efficacy is not affected by blood glucose control levels, but attention should be paid to the risk of hypotension when used in combination with antihypertensive drugs.
2. Intervention for psychological ED
For ED patients caused by psychological factors such as anxiety and depression, medication can break the vicious cycle of "anxiety failure" by rapidly improving physiological function.
A double-blind trial involving 120 patients with psychogenic erectile dysfunction showed that after 8 weeks of continuous use of 50mg sildenafil, patients' sexual confidence scores increased by 42% and partner satisfaction increased by 38%. This dual improvement of physiology and psychology makes it an important part of comprehensive treatment for psychological ED.
3. Comprehensive management of mixed ED
For mixed ED with both organic and psychological factors, drug combined with behavioral therapy (such as sexual concentration training) can significantly improve the efficacy. Clinical data shows that the International Erectile Function Index (IIEF) score of the medication+behavioral therapy group increased by 5.2 points after 6 months, which is better than the 3.8 points of the medication only group. This multimodal intervention strategy is particularly suitable for patients with moderate to severe ED.
1. Targeted therapy for pulmonary arterial hypertension
High dose sildenafil citrate (20-80mg/day) is approved for the treatment of pulmonary arterial hypertension (PAH), and its mechanism of action is similar to ED treatment: by inhibiting PDE5 enzyme in pulmonary vascular smooth muscle, reducing cGMP degradation, and promoting vasodilation. Research shows that after 12 weeks of treatment, patients' 6-minute walking distance increased by 46 meters, pulmonary vascular resistance decreased by 22%, and the incidence of adverse reactions was lower than that of traditional prostacyclin drugs.
2. Indirect protection of the cardiovascular system
Low dose sildenafil citrate powder (25mg every other day) showed the effect of improving endothelial function and inhibiting the formation of atherosclerotic plaque in animal experiments.
An observational study on stable angina patients with coronary heart disease suggests that long-term use of sildenafil may reduce the risk of major cardiovascular events (HR=0.72, 95% CI 0.54-0.96), but its clinical value still needs to be validated through large-scale randomized controlled trials.
3. Preventive application of altitude sickness
In areas above 5000 meters above sea level, sildenafil can prevent high-altitude pulmonary edema by improving pulmonary circulation. A study on mountaineers showed that prophylactic use of 50mg sildenafil reduced the incidence of high altitude pulmonary edema from 12% to 3%, without increasing the risk of acute mountain sickness. The mechanism may be related to reducing pulmonary artery pressure and improving oxygenation.
1. Sexual function rehabilitation for patients with spinal cord injury
For patients with neurogenic ED after spinal cord injury, sildenafil combined with penile vibration stimulation therapy can significantly improve the success rate of erection. A trial involving 45 patients showed that the success rate of erections in the combination therapy group was 67% after 6 months, higher than the 40% success rate in the medication group alone. This multimodal intervention strategy provides new ideas for sexual rehabilitation of spinal cord injury patients.
2. Adjuvant therapy for postoperative sexual function protection
After radical prostatectomy, sildenafil can promote the regeneration of neurovascular bundles through early intervention (starting 2 weeks after surgery).
Research has shown that patients who use sildenafil 6 months after surgery have a 28% higher rate of erectile function recovery compared to the control group (54% vs 26%), and it does not affect tumor control rate. This' neuroprotective 'effect makes it an important means of managing sexual function after prostate cancer surgery.
3. Sexual therapy with partner participation
Under the guidance of a sex therapist, sildenafil can be used as an auxiliary tool for partners to participate in treatment together. By improving male physiological function, reducing sexual anxiety in both partners, and promoting intimate behavior. A study involving 80 couples showed that after 6 months of medication combined with partner support therapy, partner satisfaction increased by 35% and sexual communication frequency increased by 2.1 times per month.
Sildenafil citrate has gradually expanded from ED treatment to multiple fields such as pulmonary hypertension, cardiovascular protection, and sexual rehabilitation. The diversity of its therapeutic efficacy stems from precise inhibition of PDE5 enzyme, while the guarantee of medication safety relies on strict contraindication management and personalized dose adjustment.
Sildenafil citrate powder (also known as Viagra) is a common drug used to treat impotence and erectile dysfunction. Its chemical name is sildenafil and it is a 5-phosphatase inhibitor. The synthesis of this compound typically involves multiple steps, including the following main steps:
1. Synthesis of glutaraldehyde: glutaraldehyde is synthesized by hydrogenation of m-nitrobenzaldehyde.
2. Synthesis of glutarylimide: Glutaraldehyde and urea react under acidic conditions to form glutarylimide.
3. Synthesis of glutarylhydrazide: React glutarylimine with ammonia to form glutarylhydrazide.
4. Synthesis of glutarylimine diacetate: reacting glutarylhydrazide with diacetate anhydride to produce glutarylimine diacetate.
5. Synthesis of sildenafil: The final step is to react glutarylimide diacetate with ethylenediamine (1,2-ethylenediamine) in an alkaline environment to form sildenafil.
These steps are a brief description of a synthesis method for sildenafil, but the actual synthesis process may vary due to factors such as pharmaceutical companies and patents. It is worth noting that the synthesis of chemicals requires strict laboratory conditions and professional knowledge, and should be carried out by professionals in a controlled environment.
Sildenafil citrate, also known as sildenafil citrate, is a drug with significant impact in the pharmaceutical field, mainly used to treat male erectile dysfunction (ED). Next, we will provide a detailed introduction to sildenafil citrate from the perspective of pharmacological properties.
Firstly
From the perspective of pharmacological mechanisms, sildenafil citrate is a selective inhibitor of cyclic guanosine phosphate (cGMP) specific type 5 phosphodiesterase (PDE5). The physiological mechanism of penile erection involves the release of nitric oxide (NO) in the penile sponge during sexual stimulation. NO activates guanylate cyclase, leading to an increase in cGMP levels, causing relaxation of smooth muscle in the sponge body and blood filling. Sildenafil citrate selectively inhibits PDE5, enhances the NO cGMP pathway, and increases cGMP levels, leading to relaxation of penile corpus cavernosum smooth muscle and natural erectile response in patients with erectile dysfunction to sexual stimulation.
In terms of pharmacokineticsIn terms of pharmacokinetics,
Sildenafil citrate is rapidly absorbed after oral administration, with an absolute bioavailability of about 40%. Its pharmacokinetic parameters are proportional to the recommended dose range. The drug is mainly metabolized through the liver (cytochrome P450 isoenzyme 3A4 pathway), generating an active metabolite with properties similar to sildenafil. Strong inhibitors of cytochrome P450 isoenzyme 3A4 (CYP4503A4) such as erythromycin, ketoconazole, and itraconazole, as well as non-specific inhibitors of cytochrome P450 (CYP450) such as cimetidine combined with sildenafil, may lead to an increase in plasma levels of sildenafil. The elimination half-life of sildenafil and its metabolites is about 4 hours. When given 25-100mg on an empty stomach, the maximum plasma concentration (Cmax) of 127-560ng/ml is reached within approximately 1 hour. At the maximum plasma concentration of total sildenafil, the Cmax of free sildenafil is 22ng/ml.
In terms of duration of efficacy
Experiments have shown that the efficacy of sildenafil citrate can last up to 4 hours, but the response is weaker than at 2 hours. This indicates that after taking sildenafil citrate, patients can enjoy its benefits for a relatively long period of time.
In addition to its impact on penile erection function
Sildenafil citrate powder also has certain pharmacological properties in its response to myocardial injury. Due to the absence of PDE5 in normal or diseased cardiac conduction tissue, myocardial cells, endothelial cells, and lymphoid tissue, sildenafil (PDE5 inhibitor) has no positive inotropic effect and cannot directly affect myocardial contractile function. In normal male volunteers, a single oral dose of 100mg of sildenafil did not cause clinically significant electrocardiogram changes. In addition, the effect of sildenafil citrate on blood pressure is also worth paying attention to. After a single oral dose of 100mg of sildenafil, the blood pressure of healthy male patients decreased in a supine position, but there was no difference compared to the placebo group 8 hours after taking the medication. This indicates that at a reasonable dosage, the effect of sildenafil citrate on blood pressure is temporary and recoverable.
The discovery history of sildenafil citrate is a scientific journey full of exploration and innovation, which has brought revolutionary changes to human health. Next, we will review in detail the discovery process of sildenafil citrate.
In the early 1980s, Pfizer began to focus on researching drugs for treating cardiovascular and cerebrovascular diseases. At that time, scientists generally believed that cardiovascular and cerebrovascular diseases were related to certain key enzymes in the circulatory system. In this context, Pfizer has established a dedicated research team to screen and study various possible enzyme inhibitors.
Among numerous research directions, the research team has particularly focused on an enzyme called phosphodiesterase 5 (PDE5). This enzyme plays a role in regulating vascular smooth muscle tension in the human body and is crucial for the health of the cardiovascular system. Scientists have found that inhibiting the activity of PDE5 can effectively promote vasodilation, lower blood pressure, and improve symptoms of cardiovascular and cerebrovascular diseases.
However, in the initial research process, scientists did not directly associate PDE5 inhibitors with erectile dysfunction (ED). In fact, their initial goal was to develop a drug for treating angina and hypertension. However, in early clinical studies, scientists unexpectedly found that this PDE5 inhibitor also has significant effects in treating ED.
This discovery has aroused great interest among scientists. They began to delve into the mechanism by which this drug affects erectile function. After a series of experiments and clinical studies, scientists have found that sildenafil citrate can effectively increase the concentration of nitric oxide (NO) in the penile sponge by inhibiting the activity of PDE5, thereby promoting penile vascular dilation, increasing blood flow, and achieving improvement in erectile function.
In the discovery process of sildenafil citrate, scientists not only demonstrated outstanding scientific research ability and innovative spirit, but also revealed the randomness and uncertainty of scientific research to us. Their initial goal was to develop a drug for treating cardiovascular and cerebrovascular diseases, but in the end, they unexpectedly discovered an effective drug for treating ED. The discovery of this kind of "yin and yang error" not only brings new treatment options for patients, but also opens up new paths for the development of the medical field.
In short, the discovery history of sildenafil citrate powder is a challenging and innovative scientific journey. It not only reveals the randomness and uncertainty of scientific research, but also showcases the spirit of continuous exploration and innovation among scientists. In the future, we believe that with the continuous progress and development of science and technology, humanity will discover more revolutionary drugs and treatment methods, making greater contributions to human health.
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